WO2021235273A1 - ケイ素含有組成物及び半導体基板の製造方法 - Google Patents
ケイ素含有組成物及び半導体基板の製造方法 Download PDFInfo
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- WO2021235273A1 WO2021235273A1 PCT/JP2021/017867 JP2021017867W WO2021235273A1 WO 2021235273 A1 WO2021235273 A1 WO 2021235273A1 JP 2021017867 W JP2021017867 W JP 2021017867W WO 2021235273 A1 WO2021235273 A1 WO 2021235273A1
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- silicon
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- polysiloxane
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Definitions
- the present invention relates to a method for producing a silicon-containing composition and a semiconductor substrate.
- etching is performed using a resist pattern obtained by exposing and developing a resist film laminated on a substrate via an organic underlayer film, a silicon-containing film, or the like as a mask.
- a multilayer resist process or the like for forming a patterned substrate is used (see International Publication No. 2012/039337).
- the shape (rectangularity) of the resist pattern after alkaline development of the resist film can be impaired when further developing the multilayer resist process.
- the silicon-containing film may be removed by using a removing liquid instead of etching from the viewpoint of reducing the influence on the substrate or the like at the time of etching and improving the production efficiency.
- the removal of the silicon-containing film by the removing liquid may be insufficient.
- An object of the present invention is to provide a silicon-containing composition and a method for producing a semiconductor substrate, which can form a resist pattern having an excellent rectangular cross-sectional shape and can form a silicon-containing film which can be easily removed by a removing liquid. There is something in it.
- the present invention is silicon for forming a resist underlayer film that is removed by a basic liquid by forming a pattern by etching using a resist pattern as a mask and then etching using the formed pattern as a mask.
- It is a contained composition
- Two types of polysiloxane and Containing with solvent, The above two types of polysiloxane are each A first polysiloxane having a group containing at least one selected from the group consisting of an ester bond, a carbonate structure and a cyano group. It relates to a silicon-containing composition which is a second polysiloxane having a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms.
- the silicon-containing composition contains two specific types of polysiloxane.
- a silicon-containing film is formed from the silicon-containing composition, a resist pattern having an excellent rectangular cross-sectional shape can be formed, and the silicon-containing film can be easily removed by a basic liquid as a removing liquid.
- pattern rectangularity the rectangularity of the cross-sectional shape of the resist pattern
- film removability the removability of the silicon-containing film
- the change in the pattern rectangularity is that when the polarity of the components in the silicon-containing film is high, the developing solution of the resist film permeates the silicon-containing film, causing the silicon-containing film to swell and the adhesion to the resist film to decrease. As a result, it is considered that the cause is that the resist pattern is deformed or collapsed. Further, it is considered that the decrease in the film removing property is caused by the fact that if the hydrophobicity of the component in the silicon-containing film is high, it becomes difficult for the basic liquid as the removing liquid to permeate into the silicon-containing film.
- the first polysiloxane contained in the silicon-containing composition has a group containing at least one selected from the group consisting of an ester bond, a carbonate structure and a cyano group (hereinafter, also referred to as "polar group"). It has a relatively highly polar structure.
- the second polysiloxane has a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms (hereinafter, also referred to as "hydrophobic group”), and has a relatively highly hydrophobic structure. ..
- hydrophobic group a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms
- the first polysiloxane having a relatively high polarity and the second polysiloxane having a relatively high hydrophobicity coexist. Therefore, when a silicon-containing film is formed, the silicon-containing film is contained. The balance between the polarity and hydrophobicity of the film can be achieved at a high level, and both the pattern rectangularity and the film removability can be achieved at the same time.
- the hydrophobic second polysiloxane is unevenly distributed on the surface side in the film, and the polar first polysiloxane is unevenly distributed on the substrate side in the film. Due to the uneven distribution structure of these two types of polysiloxane in the silicon-containing film, the surface side of the silicon-containing film becomes hydrophobic and the pattern rectangularity is improved, and after etching using the silicon-containing film pattern as a mask, The second polysiloxane unevenly distributed on the surface side is removed by etching, and it is presumed that this is one of the reasons why the film removability is improved.
- the silicon-containing composition is a resist that forms a pattern by etching using a resist pattern as a mask, then etches using the formed pattern as a mask, and removes the resist with a basic liquid. It can be suitably applied to the formation of an underlayer film.
- the present invention comprises a step of directly or indirectly applying the silicon-containing composition to a substrate to form a silicon-containing film.
- the present invention relates to a method for manufacturing a semiconductor substrate, which comprises a step of removing the silicon-containing film pattern with a basic liquid.
- the above-mentioned silicon-containing composition is used for forming a silicon-containing film as a lower layer of a resist film, and a resist pattern having an excellent rectangular shape in cross section can be formed, and a silicon-containing film using a basic liquid is used. Since it is easy to remove silicon, it is possible to efficiently manufacture a high-quality semiconductor substrate.
- the silicon-containing composition according to the present embodiment contains two specific types of polysiloxane (hereinafter, the two types of polysiloxane are collectively referred to as "specific polysiloxane") and a solvent.
- the composition may contain other optional components (hereinafter, also simply referred to as "arbitrary components") as long as the effects of the present invention are not impaired.
- the silicon-containing composition By containing the specific polysiloxane and the solvent, the silicon-containing composition can form a resist pattern having an excellent rectangular cross-sectional shape when forming a resist pattern on the silicon-containing film by alkaline development. Further, the silicon-containing film formed by the silicon-containing composition is excellent in the removability of the silicon-containing film by the basic liquid. Since the above-mentioned effects are obtained, the silicon-containing composition can be suitably used as a composition for forming a silicon-containing film (that is, a composition for forming a silicon-containing film).
- the method for developing a resist film is roughly classified into organic solvent development using an organic solvent as a developer and alkaline development using an alkaline solution as a developer.
- the silicon-containing composition is applicable to both development methods, it is preferably used for forming an underlayer film of a resist film to be alkaline-developed.
- the silicon-containing composition is used for forming an underlayer film of a resist film for alkaline development, only the exposed portion of the resist film is dissolved and the resist is dissolved when the resist film is formed and exposed and then subjected to alkaline development.
- the silicon-containing film which is the underlying film of the film, does not dissolve, and a resist pattern having an excellent rectangular cross-sectional shape can be formed.
- a positive type resist film is particularly preferable, and for exposure with ArF excimer laser light (for ArF exposure) or for exposure with extreme ultraviolet rays (also referred to as “EUV”) (for EUV exposure), which will be described later.
- Positive type resist film is more preferable.
- the silicon-containing composition is suitably used for forming an underlayer film of an alkali-developing resist film for ArF exposure or EUV exposure.
- the silicon-containing composition comprises two polysiloxanes, namely a first polysiloxane and a second polysiloxane.
- polysiloxane means a compound containing a siloxane bond (-Si-O-Si-).
- the first polysiloxane is a polysiloxane having a polar group.
- the polar group is a group containing at least one selected from the group consisting of an ester bond, a carbonate structure and a cyano group (hereinafter, also referred to as "ester bond or the like").
- the ester bond includes not only the ester bond in the chain structure but also the ester bond incorporated in the cyclic structure (cyclic ester, that is, the lactone structure).
- the carbonate structure includes not only the carbonate structure in the chain structure but also the carbonate structure incorporated in the cyclic structure (cyclic carbonate structure).
- the silicon-containing composition can contain one or more first polysiloxanes.
- a first polysiloxane having a group containing an ester bond as a polar group and a first polysiloxane having a group containing a carbonate structure as a polar group.
- the first polysiloxane preferably has a first structural unit represented by the following formula (1), which will be described later.
- the first polysiloxane may have other structural units (hereinafter, also simply referred to as “other structural units”) other than the first structural unit as long as the effects of the present invention are not impaired.
- other structural units hereinafter, also simply referred to as “other structural units”
- the first structural unit is a structural unit represented by the following formula (1).
- the first polysiloxane can have one or more first structural units.
- the first structural unit can form a silicon-containing film having better film removability.
- X is a group containing at least one selected from the group consisting of an ester bond, a carbonate structure and a cyano group.
- a is an integer of 1 to 3. When a is 2 or more, a plurality of Xs are the same or different.
- R 1 is a monovalent organic group, a hydroxy group or a halogen atom having 1 to 20 carbon atoms.
- b is an integer of 0 to 2. If b is 2, the two R 1 may be the same or different from each other. However, a + b is 3 or less.
- the "organic group” means a group containing at least one carbon atom
- the "carbon number” means the number of carbon atoms constituting the group.
- the polar group represented by X is not particularly limited as long as it contains an ester bond or the like, but a monovalent organic group having 1 to 20 carbon atoms including an ester bond or the like can be mentioned.
- a structure in which one or more hydrogen atoms in this organic group are replaced by an ester bond or the like, a structure in which an ester bond or the like is incorporated between two carbon atoms, or a structure in which these are combined, etc. can be mentioned.
- the monovalent organic group having 1 to 20 carbon atoms in the polar group represented by X is, for example, a monovalent hydrocarbon group having 1 to 20 carbon atoms, and the carbon of this hydrocarbon group.
- a group containing a divalent heteroatom-containing group between carbon bonds hereinafter, also referred to as “group ( ⁇ )”
- group ( ⁇ ) a group containing a divalent heteroatom-containing group between carbon bonds
- a group substituted with a heteroatom-containing group (hereinafter, also referred to as “group ( ⁇ )”), a above-mentioned hydrocarbon group, the above-mentioned group ( ⁇ ) or the above-mentioned group ( ⁇ ) and a divalent heteroatom-containing group are combined. Examples thereof include a group (hereinafter, also referred to as “group ( ⁇ )”).
- the "hydrocarbon group” includes a chain hydrocarbon group, an alicyclic hydrocarbon group and an aromatic hydrocarbon group. This “hydrocarbon group” may be a saturated hydrocarbon group or an unsaturated hydrocarbon group.
- the "chain hydrocarbon group” refers to a hydrocarbon group having only a chain structure without containing a cyclic structure, and includes both a linear hydrocarbon group and a branched hydrocarbon group.
- the "alicyclic hydrocarbon group” refers to a hydrocarbon group containing only an alicyclic structure as a ring structure and not containing an aromatic ring structure, and is a monocyclic alicyclic hydrocarbon group and a polycyclic alicyclic group. Contains both hydrocarbon groups.
- aromatic hydrocarbon group refers to a hydrocarbon group containing an aromatic ring structure as a ring structure. However, it does not have to be composed only of an aromatic ring structure, and a chain structure or an alicyclic structure may be contained in a part thereof.
- Examples of the monovalent hydrocarbon group having 1 to 20 carbon atoms include a monovalent chain hydrocarbon group having 1 to 20 carbon atoms, a monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms, and 6 carbon atoms. Examples thereof include ⁇ 20 monovalent aromatic hydrocarbon groups.
- Examples of monovalent chain hydrocarbon groups having 1 to 20 carbon atoms include methyl group, ethyl group, n-propyl group, i-propyl group, n-butyl group, sec-butyl group, iso-butyl group and tert.
- -Alkyl groups such as butyl groups, alkenyl groups such as ethenyl groups, propenyl groups and butenyl groups, alkynyl groups such as ethynyl groups, propynyl groups and butynyl groups and the like can be mentioned.
- Examples of monovalent alicyclic hydrocarbon groups having 3 to 20 carbon atoms include monocyclic saturated hydrocarbon groups such as cyclopentyl groups and cyclohexyl groups, norbornyl groups, adamantyl groups, tricyclodecyl groups, and tetracyclos.
- Polycyclic alicyclic saturated hydrocarbon group such as dodecyl group, monocyclic alicyclic unsaturated hydrocarbon group such as cyclopentenyl group and cyclohexenyl group, norbornenyl group, tricyclodecenyl group, tetracyclodode
- Examples thereof include a polycyclic alicyclic unsaturated hydrocarbon group such as a senyl group.
- Examples of the monovalent aromatic hydrocarbon group having 6 to 20 carbon atoms include an aryl group such as a phenyl group, a tolyl group, a xylyl group, a naphthyl group and an anthryl group, a benzyl group, a phenethyl group, a naphthylmethyl group and an anthrylmethyl group.
- Examples include an aralkyl group such as a group.
- heteroatom constituting the divalent and monovalent heteroatom-containing group examples include an oxygen atom, a nitrogen atom, a sulfur atom, a phosphorus atom, a silicon atom, a halogen atom and the like.
- halogen atom examples include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- the group etc. can be mentioned.
- R' is a hydrogen atom or a monovalent hydrocarbon group.
- Examples of the monovalent heteroatom-containing group include a halogen atom, a hydroxy group, a carboxy group, a cyano group, an amino group, a sulfanyl group and the like.
- 1 or 2 is preferable, and 1 is more preferable.
- Examples of the monovalent organic group having 1 to 20 carbon atoms represented by R 1 include the same groups as those exemplified as the monovalent organic group having 1 to 20 carbon atoms in X described above.
- Examples of the halogen atom represented by R 1 include a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- the R 1, was replaced with monovalent chain hydrocarbon group, a monovalent aromatic hydrocarbon group or a monovalent monovalent some or all of the hydrogen atoms included in the hydrocarbon group a hetero atom-containing group 1
- a valent group is preferred, an alkyl or aryl group is more preferred, and a methyl, ethyl or phenyl group is even more preferred.
- 0 or 1 is preferable, and 0 is more preferable.
- X in the above formula (1) may be a group containing an ester bond.
- X in the above formula (1) contains an ester bond, it is preferable that X is represented by the following formula (2).
- L 1 is a single bond or a divalent linking group.
- L 2 is **- COO- or **- OCO-. ** is a bond to L 1.
- R 8 is a hydrogen atom or a monovalent hydrocarbon group having 1 to 20 carbon atoms.
- R 9 and R 10 are independently monovalent chain hydrocarbon groups having 1 to 10 carbon atoms or monovalent alicyclic hydrocarbon groups having 3 to 20 carbon atoms, or groups thereof. Represents a divalent alicyclic group having 3 to 20 carbon atoms, which are combined with each other and are composed of carbon atoms to which they are bonded. )
- Examples of the divalent linking group represented by L 1 include a divalent organic group having 1 to 10 carbon atoms.
- the divalent organic group having 1 to 10 carbon atoms for example, among the groups exemplified as the monovalent organic group having 1 to 20 carbon atoms in X of the above formula (1), the monovalent organic group having 1 to 10 carbon atoms Examples thereof include a group obtained by removing one hydrogen atom from an organic group.
- the above L 1 is a single bond, a divalent heteroatom-containing group having a divalent heteroatom-containing group between carbon-carbon bonds of a divalent hydrocarbon group having 1 to 10 carbon atoms or a divalent hydrocarbon group having 1 to 10 carbon atoms.
- a group containing —S— is preferable, and a group containing —S— between carbon-carbon bonds of a single bond, an alkylene group, an alkenylene group or an alkylene group is more preferable.
- the monovalent chain hydrocarbon group having 1 to 10 carbon atoms represented by R 9 and R 10 is a monovalent chain hydrocarbon having 1 to 20 carbon atoms exemplified in X of the above formula (1).
- a monovalent chain hydrocarbon group having 1 to 10 carbon atoms is preferably mentioned.
- the monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms represented by R 9 and R 10 is a monovalent alicyclic hydrocarbon group having 3 to 20 carbon atoms exemplified in X of the above formula (1). Hydrocarbon groups are preferred.
- the carbon atoms 3 to 3 represented by R 9 and R 10 are used.
- Examples thereof include a group obtained by removing one hydrogen atom from 20 monovalent alicyclic hydrocarbon groups.
- R 8 to R 10 are monovalent chain hydrocarbon groups, or R 8 is a monovalent chain hydrocarbon group. It is preferable that R 9 and R 10 are divalent alicyclic groups having 3 to 20 carbon atoms, which are composed of carbon atoms to which they are bonded to each other. In this case, examples of the structure prior to L 2 are preferably a tert-butyl group, a 1-methylcyclopentane-1-yl group and the like.
- any of R 8 to R 10 is a hydrogen atom, or any of R 8 to R 10 is a monovalent chain hydrocarbon group.
- the residual group is preferably a hydrogen atom.
- the structure prior to L 2 is preferably a methyl group or the like.
- the L 2 is preferably **- COO- from the viewpoint of film removability.
- Examples of the group containing a lactone structure as the ester bond in X of the above formula (1) include a group represented by the following formula (3).
- L 3 is a single bond or a divalent linking group.
- R 5 is a monovalent group having a lactone structure. * Indicates a bond with a silicon atom in the above formula (1).
- Examples of the divalent linking group represented by the above L 3 include a group similar to the group exemplified as L 1 in the above formula (2).
- the L 3, preferably a single bond.
- lactone structure at R 5 examples include propiolactone structure, butyrolactone structure, monocyclic lactone structure such as valerolactone structure, caprolactone structure, cyclopentane lactone structure, a cyclohexane lactone structure, norbornane lactone structure, benzo butyrolactone structure, benzo
- examples thereof include a polycyclic lactone structure such as a valerolactone structure.
- a monocyclic lactone structure is preferable, and a butyrolactone structure is more preferable.
- Examples of the group containing a carbonate structure as the ester bond in X in the above formula (1) include a group containing a chain carbonate structure or a group containing a cyclic carbonate structure.
- Examples of the group containing the chain carbonate structure include a group in which a carbonate structure is incorporated between adjacent carbon atoms in a monovalent chain hydrocarbon group having 1 to 20 carbon atoms.
- the monovalent chain hydrocarbon group having 1 to 20 carbon atoms the group exemplified as the monovalent chain hydrocarbon group having 1 to 20 carbon atoms in X of the above formula (1) can be preferably adopted. can.
- Examples of the group containing the cyclic carbonate structure include a group represented by the following formula (4).
- L 4 is a single bond or a divalent linking group.
- R 6 is a monovalent group having a cyclic carbonate structure. * Indicates a bond with a silicon atom in the above formula (1).
- Examples of the divalent linking group represented by the above L 4 include a group similar to the group exemplified as L 1 in the above formula (2).
- the L 4, preferably divalent alkylene group having 2 to 10 carbon atoms.
- examples of the group containing a cyano group represented by X include a group in which one or more hydrogen atoms in a monovalent hydrocarbon group having 1 to 20 carbon atoms are replaced with a cyano group. Be done.
- the monovalent hydrocarbon group having 1 to 20 carbon atoms the monovalent hydrocarbon group having 1 to 20 carbon atoms exemplified in X of the above formula (1) can be preferably adopted.
- a group in which one or more hydrogen atoms in the monovalent chain hydrocarbon group having 1 to 10 carbon atoms is substituted with a cyano group is more preferable, and a cyanomethyl group and a 2-cyanoethyl group are particularly preferable.
- the X in the above formula (1) is preferably a group containing an ester bond from the viewpoint of film removability.
- the first structural unit is, for example, a structural unit derived from a compound represented by the following formulas (1-1) to (1-15) (hereinafter, "first structural unit (1) to first structural unit (15)). It is also called.) And so on.
- the first structural unit (1) to (4) or the first structural unit (10) to (12) is preferable from the viewpoint of further improving the film removability, and the first structural unit (1).
- ⁇ (4) is more preferable.
- the lower limit of the content ratio of the first structural unit in all the structural units constituting the first polysiloxane is preferably 0.5 mol%, more preferably 1 mol%, still more preferably 2 mol%.
- the upper limit of the content ratio of the first structural unit is preferably 40 mol%, more preferably 35 mol%, still more preferably 30 mol%.
- the first polysiloxane may have a third structural unit represented by the following formula (5) as a structural unit other than the first structural unit.
- a third structural unit represented by the following formula (5) as a structural unit other than the first structural unit.
- R 3 is a substituted or unsubstituted aryl group having 6 to 20 carbon atoms.
- d is an integer of 1 to 3. If d is 2 or more, plural R 3 may be the same or different.
- Examples of the aryl group having 6 to 20 carbon atoms represented by R 3 include a phenyl group, a naphthyl group, an anthrasenyl group and the like.
- Examples of the substituent of the aryl group include an alkyl group having 1 to 5 carbon atoms, a hydroxy group, a halogen atom and the like. Among them, a halogen atom is preferable, and a fluorine atom is more preferable.
- the third structural unit is, for example, a structural unit derived from a compound represented by the following formulas (5-1) to (5-8) (hereinafter, “third structural unit (1) to third structural unit (8)). It is also called.) And so on.
- the lower limit of the content ratio of the third structural unit in all the structural units constituting the first polysiloxane is preferably 5 mol%, more preferably 10 mol%. 15 mol% is more preferred. Further, as the upper limit of the content ratio of the third structural unit, 50 mol% is preferable, 40 mol% is more preferable, and 30 mol% is further more preferable. When the content ratio of the third structural unit is within the above range, a silicon-containing film having better antireflection performance can be formed.
- the first polysiloxane may have a fourth structural unit represented by the following formula (6) as a structural unit other than the first structural unit.
- the oxygen gas etching resistance of the silicon-containing film formed by the silicon-containing composition can be improved.
- R 4 is a monovalent alkoxy group substituted or unsubstituted C 1-20, a is .e is hydroxy group or a halogen atom, .e is an integer of 0 to 3 If 2 or more, R 4 may be the same or different.
- the monovalent alkoxy groups having 1 to 20 carbon atoms represented by R 4 specifically, for example, a methoxy group, an ethoxy group, n- propyl group, such as an isopropoxy group Alkoxy groups can be mentioned.
- a halogen atom a fluorine atom, a chlorine atom, a bromine atom, an iodine atom and the like can be mentioned.
- R 4 represents an alkoxy group are preferred, a methoxy group is more preferable.
- the lower limit of the content ratio of the fourth structural unit in all the structural units constituting the first polysiloxane is preferably 40 mol%, more preferably 45 mol%. 50 mol% is more preferred. Further, as the upper limit of the content ratio of the fourth structural unit, 95 mol% is preferable, 90 mol% is more preferable, and 85 mol% is further preferable.
- the lower limit of the content ratio of the first polysiloxane in the total mass of the first polysiloxane and the second polysiloxane described later is preferably 40% by mass, more preferably 50% by mass, still more preferably 60% by mass. Above and below the above content ratio, 99% by mass is preferable, 98% by mass is more preferable, and 95% by mass is further preferable. This makes it possible to improve the film removability while maintaining the pattern rectangularity.
- the first polysiloxane may have a second structural unit incorporated into the second polysiloxane described later, as long as it does not affect the film removability.
- the polysiloxane in the silicon-containing composition according to the present embodiment is treated as the first polysiloxane even if it has another structural unit (for example, the second structural unit) as long as it has the first structural unit.
- the second polysiloxane is a polysiloxane having a hydrophobic group.
- the hydrophobic group is a substituted or unsubstituted hydrocarbon group having 1 to 20 carbon atoms.
- the silicon-containing composition can form a silicon-containing film capable of imparting excellent cross-sectional rectangularity to the resist pattern.
- the silicon-containing composition can contain one or more second polysiloxanes.
- hydrocarbon group having 1 to 20 carbon atoms the group exemplified as the hydrocarbon group having 1 to 20 carbon atoms in X in the above formula (1) can be preferably adopted.
- the second polysiloxane preferably has a second structural unit represented by the following formula (7).
- R 2 is a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms.
- c is an integer of 1 to 3. When c is 2 or more, a plurality of R 2s are the same or different.
- Examples of the alkyl group having 1 to 10 carbon atoms represented by R 2 include a methyl group, an ethyl, an n-propyl group, an i-propyl group, an n-butyl group, an i-butyl group, a t-butyl group and the like. Be done.
- substituent of the alkyl group examples include halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- halogen atoms such as a fluorine atom, a chlorine atom, a bromine atom and an iodine atom.
- Alkyl group having 1 to 10 carbon atoms represented by R 2 is unsubstituted is preferred.
- C is preferably 1 or 2, more preferably 1.
- the lower limit of the content ratio of the second structural unit in all the structural units constituting the second polysiloxane is preferably 10 mol%, more preferably 15 mol%, still more preferably 20 mol%.
- the upper limit of the content ratio is preferably 100 mol%, more preferably 95 mol%, further preferably 90 mol%, and particularly preferably 85 mol%.
- the second polysiloxane may have the above-mentioned third structural unit shown as an additional structural unit in the first polysiloxane as a structural unit other than the second structural unit.
- the third structural unit it is possible to exert an antireflection effect at the time of exposure to the resist film and to form a resist pattern having an excellent rectangular cross-sectional property.
- the lower limit of the content ratio of the third structural unit in all the structural units constituting the second polysiloxane is preferably 5 mol%, more preferably 10 mol%. 15 mol% is more preferred.
- the upper limit of the content ratio of the third structural unit is preferably 50 mol%, more preferably 45 mol%, still more preferably 40 mol%.
- the second polysiloxane may have the above-mentioned fourth structural unit shown as an additional structural unit in the first polysiloxane as a structural unit other than the second structural unit.
- the oxygen gas etching resistance of the silicon-containing film formed by the silicon-containing composition can be improved.
- the lower limit of the content ratio of the fourth structural unit in all the structural units constituting the second polysiloxane is preferably 10 mol%, more preferably 15 mol%. 20 mol% is more preferred. Further, as the upper limit of the content ratio of the fourth structural unit, 90 mol% is preferable, 80 mol% is more preferable, and 70 mol% is further more preferable.
- the lower limit of the content ratio of the second polysiloxane in the total mass of the first polysiloxane and the second polysiloxane is preferably 1% by mass, more preferably 2% by mass, still more preferably 5% by mass.
- the upper limit of the content ratio is preferably 60% by mass, more preferably 50% by mass, and even more preferably 40% by mass. This makes it possible to improve the pattern rectangularity while maintaining the film removability.
- the lower limit of the total content ratio of the two types of polysiloxane (specific polysiloxane) in the silicon-containing composition is preferably 0.1% by mass, preferably 0.5% by mass, based on all the components contained in the silicon-containing composition. Is more preferable, and 1% by mass is further preferable.
- the upper limit of the content ratio is preferably 10% by mass, more preferably 7.5% by mass, still more preferably 5% by mass.
- the specific polysiloxane is preferably in the form of a polymer.
- polymer refers to a compound having two or more structural units, and when the same structural unit is continuous in two or more in a polymer, this structural unit is also referred to as a "repeating unit".
- the lower limit of the polystyrene-equivalent weight average molecular weight (Mw) of the specific polysiloxane by gel permeation chromatography (GPC) is preferably 1,000, more preferably 1,100. , 1,200 is more preferable, and 1,500 is particularly preferable.
- Mw polystyrene-equivalent weight average molecular weight
- GPC gel permeation chromatography
- the upper limit of the Mw 8,000 is preferable, 5,000 is more preferable, 3,000 is further preferable, and 2,500 is particularly preferable.
- the Mw of the specific polysiloxane uses a GPC column (2 "G2000HXL”, 1 "G3000HXL” and 1 "G4000HXL”) manufactured by Tosoh Corporation, and gel permeation is performed under the following conditions. It is a value measured by chromatography (GPC).
- GPC chromatography
- Eluent Tetrahydrofuran Flow rate: 1.0 mL / min Sample concentration: 1.0% by mass
- Sample injection amount 100 ⁇ L
- Detector Differential Refractometer Standard Material: Monodisperse Polystyrene
- the specific polysiloxane can be synthesized by a conventional method using a monomer that gives each structural unit.
- the monomer giving the first structural unit and, if necessary, the monomer giving another structural unit are hydrolyzed and condensed in a solvent in the presence of a catalyst such as oxalic acid and water.
- a solution containing the produced hydrolyzed condensate can be synthesized by purifying it by subjecting it to solvent substitution or the like in the presence of a dehydrating agent such as orthogiate trimethyl ester.
- each monomer is incorporated into the first polysiloxane regardless of the type by a hydrolysis condensation reaction or the like. Therefore, the content ratio of the first structural unit and other structural units in the synthesized first polysiloxane is usually the same as the ratio of the charged amount of each monomer used in the synthesis reaction.
- the second polysiloxane can also be synthesized by hydrolyzing and condensing a monomer giving a second structural unit and, if necessary, a monomer giving another structural unit.
- the solvent is not particularly limited, and examples thereof include an alcohol solvent, a ketone solvent, an ether solvent, an ester solvent, a nitrogen-containing solvent, and water.
- the silicon-containing composition may contain one or more [B] solvents.
- Examples of the alcohol solvent include monoalcohol solvents such as methanol, ethanol, n-propanol, iso-propanol, n-butanol and iso-butanol, ethylene glycol, 1,2-propylene glycol, diethylene glycol and dipropylene glycol.
- Examples include polyhydric alcohol solvents.
- ketone solvent examples include acetone, methyl ethyl ketone, methyl-n-propyl ketone, methyl-iso-butyl ketone, cyclohexanone and the like.
- ether-based solvent examples include ethyl ether, iso-propyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol monopropyl ether.
- ether-based solvent examples include ethyl ether, iso-propyl ether, ethylene glycol dibutyl ether, diethylene glycol monomethyl ether, diethylene glycol monoethyl ether, diethylene glycol diethyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether, and propylene glycol monopropyl ether.
- examples thereof include tetrahydrofuran.
- ester solvent examples include ethyl acetate, ⁇ -butyrolactone, n-butyl acetate, ethylene glycol monomethyl ether acetate, ethylene glycol monoethyl ether acetate, diethylene glycol monomethyl ether acetate, diethylene glycol monoethyl ether acetate, propylene glycol monomethyl ether acetate and acetic acid.
- ester solvent examples include propylene glycol monoethyl ether, dipropylene glycol monomethyl ether acetate, dipropylene glycol monoethyl ether acetate, ethyl propionate, n-butyl propionate, methyl lactate, ethyl lactate and the like.
- nitrogen-containing solvent examples include N, N-dimethylformamide, N, N-dimethylacetamide, N-methylpyrrolidone and the like.
- an ether solvent or an ester solvent is preferable, and an ether solvent or an ester solvent having a glycol structure is more preferable because the film forming property is excellent.
- Examples of the ether-based solvent and ester-based solvent having a glycol structure include propylene glycol monomethyl ether, propylene glycol monoethyl ether, propylene glycol monopropyl ether, propylene glycol monomethyl ether acetate, propylene glycol monoethyl ether acetate, and propylene glycol monopropyl acetate.
- Examples include ether. Among these, propylene glycol monomethyl ether acetate or propylene glycol monoethyl ether is preferable, and propylene glycol monomethyl ether is more preferable.
- the lower limit of the content ratio of the solvent in the silicon-containing composition is preferably 90% by mass, more preferably 92.5% by mass, still more preferably 95% by mass, based on all the components contained in the silicon-containing composition.
- the upper limit of the content ratio is preferably 99.9% by mass, more preferably 99.5% by mass, and even more preferably 99% by mass.
- the optional component examples include acid generators, basic compounds (including base generators), radical generators, surfactants, colloidal silica, colloidal alumina, organic polymers and the like.
- the silicon-containing composition may contain one or more arbitrary components.
- the content ratio of the optional component in the silicon-containing composition may be appropriately determined according to the type of the optional component used and within a range that does not impair the effect of the present invention. can.
- the method for preparing the silicon-containing composition is not particularly limited, and the silicon-containing composition can be prepared according to a conventional method. For example, it is prepared by mixing a solution of a specific polysiloxane, a solvent, and an arbitrary component if necessary at a predetermined ratio, and preferably filtering the obtained mixed solution with a filter or the like having a pore size of 0.2 ⁇ m or less. Can be done.
- the method for manufacturing a semiconductor substrate according to the present embodiment includes a step of directly or indirectly applying a silicon-containing composition to the substrate to form a silicon-containing film (hereinafter, also referred to as a “silicon-containing film forming step”).
- a step of directly or indirectly applying a composition for forming a resist film to the silicon-containing film to form a resist film hereinafter, also referred to as a “resist film forming step”
- a step of exposing the resist film to radiation hereinafter, also referred to as “resist film forming step”.
- exposure step a step of developing the exposed resist film to form a resist pattern
- development step a step of developing the exposed resist film to form a resist pattern
- etching step a step of etching using the silicon-containing film pattern as a mask
- etching step a step of etching using the silicon-containing film pattern as a mask
- etching step a step of removing the silicon-containing film pattern with a basic liquid
- the method for manufacturing a semiconductor substrate includes, if necessary, a step of directly or indirectly forming an organic underlayer film on the substrate (hereinafter, also referred to as “organic underlayer film forming step”) before the silicon-containing film forming step. It may be further included.
- the silicon-containing composition as the silicon-containing composition in the silicon-containing composition coating step, a resist pattern having an excellent rectangular cross-sectional shape on the silicon-containing film is used. Can be formed. Further, since the silicon-containing film formed in the silicon-containing composition coating step has excellent film removing properties, it can be removed with a basic liquid.
- Silicon-containing film forming step In this step, the silicon-containing composition is directly or indirectly applied to the substrate to form a silicon-containing film.
- a coating film of the silicon-containing composition is directly or indirectly formed on the substrate, and the silicon-containing film is usually formed by heating and curing the coating film.
- the above-mentioned silicon-containing composition is used as the silicon-containing composition.
- the substrate examples include an insulating film such as silicon oxide, silicon nitride, silicon oxynitride, and polysiloxane, and a resin substrate. Further, the substrate may be a substrate in which a wiring groove (trench), a plug groove (via), or the like is patterned.
- the coating method of the composition for forming a silicon-containing film is not particularly limited, and examples thereof include a rotary coating method.
- Examples of the case where the silicon-containing film forming composition is indirectly applied to the substrate include the case where the silicon-containing composition is applied onto another film formed on the substrate.
- Examples of other films formed on the substrate include an organic underlayer film, an antireflection film, a low-dielectric insulating film and the like formed by the organic underlayer film forming step described later.
- the atmosphere is not particularly limited, and examples thereof include an atmosphere and a nitrogen atmosphere. Normally, the coating film is heated in the atmosphere.
- Various conditions such as the heating temperature and the heating time when heating the coating film can be appropriately determined.
- the lower limit of the heating temperature 90 ° C. is preferable, 150 ° C. is more preferable, and 200 ° C. is further preferable.
- the upper limit of the heating temperature is preferably 550 ° C, more preferably 450 ° C, and even more preferably 300 ° C.
- the lower limit of the heating time is preferably 15 seconds, more preferably 30 seconds.
- the upper limit of the heating time is preferably 1,200 seconds, more preferably 600 seconds.
- the composition for forming a silicon-containing film contains an acid generator and the acid generator is a radiation-sensitive acid generator
- the formation of a silicon-containing film is promoted by combining heating and exposure. Can be done.
- the radiation used for exposure include the same radiation as exemplified in the exposure process described later.
- the lower limit of the average thickness of the silicon-containing film formed by this step 1 nm is preferable, 3 nm is more preferable, and 5 nm is further preferable.
- the upper limit of the average thickness is preferably 500 nm, more preferably 300 nm, and even more preferably 200 nm.
- the method for measuring the average thickness of the silicon-containing film is as described in Examples.
- resist film forming process In this step, the composition for forming a resist film is directly or indirectly applied to the silicon-containing film to form a resist film. By this step, a resist film is directly or indirectly formed on the silicon-containing film.
- the coating method of the resist film forming composition is not particularly limited, and examples thereof include a rotary coating method.
- the resist composition is coated so that the formed resist film has a predetermined thickness, and then prebaked (hereinafter, also referred to as “PB”) in the coated film.
- PB prebaked
- a resist film is formed by volatilizing the solvent of.
- the PB temperature and PB time can be appropriately determined according to the type of the resist film forming composition used and the like.
- the lower limit of the PB temperature is preferably 30 ° C, more preferably 50 ° C.
- the upper limit of the PB temperature is preferably 200 ° C, more preferably 150 ° C.
- As the lower limit of the PB time 10 seconds is preferable, and 30 seconds is more preferable.
- the upper limit of the PB time is preferably 600 seconds, more preferably 300 seconds.
- the resist film forming composition used in this step a known resist film forming composition can be used regardless of whether it is a so-called positive type for alkaline development or a so-called negative type for organic solvent development.
- the second polysiloxane having a hydrophobic group is unevenly distributed on the surface side and is durable to an alkaline solution for alkaline development, so that the composition for forming a positive resist film. Even a product can form a desired resist pattern.
- the composition for forming such a resist film contains, for example, a resin having an acid dissociative group or a radiation-sensitive acid generator, and is a positive type for exposure with ArF excimer laser light (for ArF exposure) described later.
- the composition for forming a resist film of the above is preferable.
- the resist film formed by the above-mentioned resist film forming composition coating step is exposed to radiation.
- the solubility of the exposed portion and the unexposed portion of the resist film in the alkaline solution which is the developing solution is different. More specifically, the solubility of the exposed portion of the resist film in the alkaline solution is enhanced.
- the radiation used for the exposure can be appropriately selected depending on the type of the resist film forming composition to be used and the like.
- Examples thereof include electromagnetic waves such as visible light, ultraviolet rays, far ultraviolet rays, X-rays and ⁇ -rays, particle beams such as electron beams, molecular beams and ion beams.
- KrF excimer laser light (wavelength 248 nm), ArF excimer laser light (wavelength 193 nm), F 2 excimer laser light (wavelength 157 nm), Kr 2 excimer laser light (wavelength 147 nm), ArKr excimer laser Light (wavelength 134 nm) or extreme ultraviolet light (wavelength 13.5 nm, also referred to as “EUV”) is more preferred, and ArF excimer laser light or EUV is even more preferred.
- the exposure conditions can be appropriately determined according to the type of the resist film forming composition to be used and the like.
- PEB post-exposure baking
- the PEB temperature and PEB time can be appropriately determined depending on the type of the resist film forming composition used and the like.
- the lower limit of the PEB temperature is preferably 50 ° C, more preferably 70 ° C.
- the upper limit of the PEB temperature is preferably 200 ° C, more preferably 150 ° C.
- the lower limit of the PEB time is preferably 10 seconds, more preferably 30 seconds.
- the upper limit of the PEB time is preferably 600 seconds, more preferably 300 seconds.
- the exposed resist film is developed. Since the above exposure step causes a difference in the solubility of the resist film in the alkaline solution, which is the developing solution, between the exposed part and the unexposed part, the solubility in the alkaline solution can be improved by performing the alkaline development.
- a resist pattern is formed by removing relatively high exposed areas.
- the developer used in alkaline development is not particularly limited, and a known developer can be used.
- Examples of the developing solution for alkaline development include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, aqueous ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, and triethylamine.
- TMAH tetramethylammonium hydroxide
- pyrrole pyrrole
- piperidine choline
- 1,8-diazabicyclo- [5.4.0] -7-undecene 1,5-diazabicyclo -[4.3.0] -5-Alkaline aqueous solution in which at least one of alkaline compounds such as nonene is dissolved
- the TMAH aqueous solution is preferable, and the 2.38 mass% TMAH aqueous solution is more preferable.
- Examples of the developing solution for organic solvent development include those similar to those exemplified as the solvent in the above-mentioned silicon-containing composition.
- washing and / or drying may be performed.
- Silicon-containing film pattern forming step In this step, the silicon-containing film is etched with the resist pattern as a mask to form a silicon-containing film pattern.
- the above etching may be dry etching or wet etching, but dry etching is preferable.
- Dry etching can be performed using, for example, a known dry etching apparatus.
- the etching gas used for dry etching can be appropriately selected depending on the elemental composition of the silicon-containing film to be etched, for example, CHF 3 , CF 4 , C 2 F 6 , C 3 F 8 , SF 6 and the like.
- Fluorine gas chlorine gas such as Cl 2 , BCl 3 , oxygen gas such as O 2 , O 3 , H 2 O, H 2 , NH 3 , CO, CO 2 , CH 4 , C 2 H 2 , C 2 H 4 , C 2 H 6 , C 3 H 4 , C 3 H 6 , C 3 H 8 , HF, HI, HBr, HCl, NO, NH 3, etc.
- Reducing gas, He, N 2 , Ar, etc. Inactive gas or the like is used. These gases can also be mixed and used.
- a fluorine-based gas is usually used for dry etching of the silicon-containing film, and a mixture of an oxygen-based gas and an inert gas is preferably used.
- etching is performed using the silicon-containing film pattern as a mask. More specifically, a patterned substrate is obtained by performing one or a plurality of etchings using the pattern formed on the silicon-containing film obtained in the silicon-containing film pattern forming step as a mask.
- a pattern of the organic underlayer film is formed by etching the organic underlayer film using the silicon-containing film pattern as a mask, and then the substrate is etched using this organic underlayer film pattern as a mask. This forms a pattern on the substrate.
- the above etching may be dry etching or wet etching, but dry etching is preferable.
- Dry etching when forming a pattern on the organic underlayer film can be performed using a known dry etching apparatus.
- the etching gas used for dry etching can be appropriately selected depending on the elemental composition of the silicon-containing film and the organic underlayer film to be etched.
- the etching gas the above-mentioned gas for etching the silicon-containing film can be preferably used, and these gases can also be mixed and used.
- Oxygen-based gas is usually used for dry etching of the organic underlayer film using the silicon-containing film pattern as a mask.
- Dry etching when forming a pattern on a substrate using an organic underlayer film pattern as a mask can be performed using a known dry etching apparatus.
- the etching gas used for dry etching can be appropriately selected depending on the elemental composition of the organic underlayer film and the substrate to be etched, and is the same as that exemplified as the etching gas used for dry etching of the organic underlayer film, for example.
- Etching gas and the like can be mentioned. Etching may be performed with a plurality of different etching gases. If the silicon-containing film remains on the substrate, the resist lower layer pattern, or the like after the substrate pattern forming step, the silicon-containing film can be removed by performing the removal step described later.
- the silicon-containing film pattern is removed with a basic liquid.
- the silicon-containing film is removed from the substrate.
- the silicon-containing film residue after etching can be removed.
- the basic solution is not particularly limited as long as it is a basic solution containing a basic compound.
- the basic compound include sodium hydroxide, potassium hydroxide, sodium carbonate, sodium silicate, sodium metasilicate, ammonia, ethylamine, n-propylamine, diethylamine, di-n-propylamine, triethylamine, methyldiethylamine and dimethylethanolamine.
- Triethanolamine tetramethylammonium hydroxide (hereinafter, also referred to as "TMAH"), tetraethylammonium hydroxide, pyrrole, piperidine, choline, 1,8-diazabicyclo [5.4.0] -7-undecene, 1 , 5-diazabicyclo [4.3.0] -5-nonen and the like.
- TMAH tetramethylammonium hydroxide
- pyrrole tetraethylammonium hydroxide
- piperidine choline
- 1,8-diazabicyclo [5.4.0] -7-undecene 1,8-diazabicyclo [5.4.0] -7-undecene
- 1 5-diazabicyclo [4.3.0] -5-nonen and the like.
- ammonia is preferable from the viewpoint of avoiding damage to the substrate.
- the basic liquid is preferably a liquid containing a basic compound and water, or a liquid containing a basic compound, hydrogen peroxide and water, from the viewpoint of further improving the removability of the silicon-containing film.
- the method for removing the silicon-containing film is not particularly limited as long as it can bring the silicon-containing film into contact with the basic liquid, and for example, a method of immersing the substrate in the basic liquid or a method of spraying the basic liquid. , A method of applying a basic liquid and the like.
- the conditions such as temperature and time for removing the silicon-containing film are not particularly limited, and can be appropriately determined according to the film thickness of the silicon-containing film, the type of basic liquid to be used, and the like.
- As the lower limit of the temperature 20 ° C. is preferable, 40 ° C. is more preferable, and 50 ° C. is further preferable.
- the upper limit of the temperature is preferably 300 ° C, more preferably 100 ° C.
- As the lower limit of the time 5 seconds is preferable, and 30 seconds is more preferable.
- the upper limit of the time is preferably 10 minutes, more preferably 180 seconds.
- washing and / or drying may be performed.
- an organic underlayer film is directly or indirectly formed on the substrate before the silicon-containing film forming step.
- This step is an arbitrary step.
- an organic underlayer film is directly or indirectly formed on the substrate.
- the organic underlayer film can be formed by coating an organic underlayer film forming composition or the like.
- a method of forming the organic underlayer film by coating the composition for forming the organic underlayer film for example, the coated film formed by directly or indirectly applying the composition for forming the organic underlayer film to the substrate is heated or exposed. Examples thereof include a method of curing or the like by performing the above.
- the composition for forming an organic underlayer film for example, "HM8006" of JSR Corporation can be used. Various conditions of heating and exposure can be appropriately determined depending on the type of the organic underlayer film forming composition to be used and the like.
- Examples of the case where the organic underlayer film is indirectly formed on the substrate include the case where the organic underlayer film is formed on the low-dielectric insulating film formed on the substrate.
- the weight average molecular weight (Mw) of each of the two polysiloxanes in this example was measured, the concentration in the solution was measured, and the average thickness of the film was measured by the following methods.
- the average thickness of the membrane was measured using a spectroscopic ellipsometer (“M2000D” from JA WOOLLAM). Specifically, the film thickness was measured at arbitrary 9 points at intervals of 5 cm including the center of the film, and the average value of those film thicknesses was calculated and used as the average thickness.
- M2000D spectroscopic ellipsometer
- Synthesis Examples 1-1 to 1-23 The monomers used for the synthesis in Synthesis Examples 1-1 to 1-23 (hereinafter, also referred to as “monomers (M-1) to (M-15)”) are shown below. Further, in the following Synthesis Examples 1-1 to 1-23, the mol% is each when the total number of moles of the monomers (M-1) to (M-15) used is 100 mol%. Means a value for a monomer.
- a propylene glycol monoethyl ether solution of -1) was obtained.
- the Mw of the first polysiloxane (A-1) was 1,700.
- the concentration of the first polysiloxane (A-1) in the propylene glycol monoethyl ether solution was 7.2% by mass.
- Example 1 Preparation of silicon-containing composition (J-1) for ArF exposure 90 parts by mass of (A-1) as the first polysiloxane, 10 parts by mass of (B-1) as the second polysiloxane, and a solvent. (C-1) 9900 parts by mass (including the solvent contained in the solution of two kinds of polysiloxane) was mixed, and the obtained solution was filtered with a filter of polytetrafluoroethylene having a pore size of 0.2 ⁇ m. , ArF A silicon-containing composition for exposure (J-1) was prepared.
- Example 2 to 37 and Comparative Examples 1 to 2 Preparation of silicon-containing compositions (J-2) to (J-37), (j-1) and (j-2) for ArF exposure are shown in Table 2 below.
- the silicon-containing compositions (j-1) and (j-2) for ArF exposure of No. 2 were prepared.
- Example 38 Preparation of silicon-containing composition (J-38) for EUV exposure 90 parts by mass of (A-23) as the first polysiloxane, 10 parts by mass of (B-1) as the second polysiloxane, and a solvent. (C-1) 9900 parts by mass (including the solvent contained in the solution of two kinds of polysiloxane) was mixed, and the obtained solution was filtered with a filter of polytetrafluoroethylene having a pore size of 0.2 ⁇ m. , A silicon-containing composition for EUV exposure (J-38) was prepared.
- a material for forming an organic underlayer film (“HM8006” of JSR Corporation) is coated on a 12-inch silicon wafer by a rotary coating method using a spin coater (“CLEAN TRACK ACT12” of Tokyo Electron Limited), and then 250.
- An organic underlayer film having an average thickness of 100 nm was formed by heating at ° C. for 60 seconds.
- the above-prepared silicon-containing composition for exposure to ArF was applied onto the organic underlayer film, heated at 220 ° C. for 60 seconds, and then cooled at 23 ° C. for 30 seconds to form a silicon-containing film having an average thickness of 20 nm. ..
- a radiation-sensitive resin composition (“ARF AR2772JN” of JSR Corporation) is applied onto the formed silicon-containing film, heated at 90 ° C. for 60 seconds, and then cooled at 23 ° C. for 30 seconds on average.
- a resist film having a thickness of 100 nm was formed.
- ArF immersion exposure apparatus (“S610C” of NIKON Co., Ltd.)
- exposure was performed through a mask having a mask size for forming a 40 nm line / 80 nm pitch under optical conditions of NA: 1.30 and Dipole.
- the substrate was heated at 100 ° C. for 60 seconds and then cooled at 23 ° C. for 60 seconds.
- using a 2.38 mass% TMAH aqueous solution (20 ° C.
- the substrate was developed by a paddle method, washed with water, and dried to obtain an evaluation substrate on which a resist pattern was formed.
- a scanning electron microscope (“CG-4000” manufactured by Hitachi High-Technologies Corporation) was used for measuring the length of the resist pattern of the evaluation substrate and observing the cross-sectional shape.
- the exposure amount at which a one-to-one line and space having a line width of 40 nm is formed was defined as the optimum exposure amount.
- the pattern rectangularity is "A" (good) when the cross-sectional shape of the pattern is rectangular, "B" (slightly good) when the cross-section of the pattern has a tail, and there is a residue (defect) in the pattern.
- the case was evaluated as "C" (defective).
- a material for forming an organic underlayer film (“HM8006” of JSR Corporation) is coated on a 12-inch silicon wafer by a rotary coating method using a spin coater (“CLEAN TRACK ACT12” of Tokyo Electron Limited), and then 250.
- An organic underlayer film having an average thickness of 100 nm was formed by heating at ° C. for 60 seconds.
- the prepared silicon-containing composition for EUV exposure was applied onto the organic underlayer film, heated at 220 ° C. for 60 seconds, and then cooled at 23 ° C. for 30 seconds to form a silicon-containing film having an average thickness of 20 nm. ..
- a resist composition (R-1) for EUV exposure is applied onto the formed silicon-containing film, heated at 130 ° C. for 60 seconds, and then cooled at 23 ° C. for 30 seconds to form a resist film having an average thickness of 50 nm. Formed.
- a resist film was used using an EUV scanner (ASML's "TWINSCAN NXE: 3300B" (NA0.3, Sigma 0.9, quadrupole illumination, 1: 1 line-and-space mask with a line width of 25 nm on the wafer).
- the substrate was heated at 110 ° C. for 60 seconds and then cooled at 23 ° C. for 60 seconds. Then, 2.38% by mass of TMAH aqueous solution (20 ° C.
- the above-prepared silicon-containing composition for ArF exposure and silicon-containing composition for EUV exposure are each coated on a 12-inch silicon wafer, heated at 220 ° C. for 60 seconds, and then cooled at 23 ° C. for 30 seconds on average.
- a silicon-containing film having a thickness of 20 nm was formed.
- the cross section of each of the obtained evaluation substrates was observed using a field emission scanning electron microscope (“SU8220” of Hitachi High-Technologies Co., Ltd.), and the silicon-containing film remained when immersed in the removal liquid for 5 minutes.
- the silicon-containing film formed from the silicon-containing composition of the example is on the film as compared with the silicon-containing film formed from the silicon-containing composition of the comparative example.
- a resist pattern with excellent rectangularity in cross-sectional shape could be formed.
- the silicon-containing film formed from the silicon-containing composition of the example had better film removability as compared with the silicon-containing film formed from the silicon-containing composition of the comparative example.
- a resist pattern having an excellent rectangular cross-sectional shape can be formed, and a silicon-containing film that can be easily removed can be formed. Therefore, these can be suitably used for manufacturing semiconductor substrates and the like.
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Abstract
Description
2種のポリシロキサンと、
溶媒とを含み、
上記2種のポリシロキサンが、それぞれ、
エステル結合、カーボネート構造及びシアノ基からなる群より選択される少なくとも1種を含む基を有する第1ポリシロキサンと、
置換又は非置換の炭素数1~20の炭化水素基を有する第2ポリシロキサンである、ケイ素含有組成物に関する。
上記ケイ素含有膜に直接又は間接にレジスト膜形成用組成物を塗工してレジスト膜を形成する工程と、
上記レジスト膜を放射線により露光する工程と、
上記露光されたレジスト膜を現像してレジストパターンを形成する工程と、
上記レジストパターンをマスクとして上記ケイ素含有膜をエッチングしてケイ素含有膜パターンを形成する工程と、
上記ケイ素含有膜パターンをマスクとしたエッチングをする工程と、
上記ケイ素含有膜パターンを塩基性液により除去する工程と
を含む半導体基板の製造方法に関する。
本実施形態に係るケイ素含有組成物は、特定の2種のポリシロキサン(以下、2種のポリシロキサンを合わせて「特定ポリシロキサン」ともいう。)と、溶媒とを含有する。当該組成物は、本発明の効果を損なわない範囲において、その他の任意成分(以下、単に「任意成分」ともいう。)を含有していてもよい。
ケイ素含有組成物は、2種のポリシロキサン、すなわち第1ポリシロキサン及び第2ポリシロキサンを含む。本明細書において「ポリシロキサン」とは、シロキサン結合(-Si-O-Si-)を含む化合物を意味する。
第1ポリシロキサンは、極性基を有するポリシロキサンである。本実施形態において、極性基は、エステル結合、カーボネート構造及びシアノ基からなる群より選択される少なくとも1種(以下、「エステル結合等」ともいう。)を含む基である。エステル結合には、鎖状構造中のエステル結合だけでなく、環状構造に組み込まれたエステル結合(環状エステル、すなわちラクトン構造)も含まれる。また、カーボネート構造には、鎖状構造中のカーボネート構造だけでなく、環状構造に組み込まれたカーボネート構造(環状カーボネート構造)も含まれる。極性基を有する第1ポリシロキサンを含有することにより、ケイ素含有組成物は膜除去性に優れるケイ素含有膜を形成することができる。
第1構造単位は、下記式(1)で表される構造単位である。第1ポリシロキサンは、1種又は2種以上の第1構造単位を有することができる。第1構造単位は下記式(1)におけるXで表される極性基を有することにより、膜除去性により優れるケイ素含有膜を形成することができる。
第1ポリシロキサンは、第1構造単位以外の他の構造単位として、下記式(5)で表される第3構造単位を有していてもよい。第3構造単位を有することにより、レジスト膜への露光時の反射防止作用を発揮して、断面矩形性に優れるレジストパターンを形成することができる。
第1ポリシロキサンは、第1構造単位以外の他の構造単位として、下記式(6)で表される第4構造単位を有していてもよい。第1ポリシロキサンが第4構造単位を有する場合、ケイ素含有組成物により形成されるケイ素含有膜の酸素ガスエッチング耐性を向上させることができる。
第2ポリシロキサンは、疎水性基を有するポリシロキサンである。本実施形態において、疎水性基は、置換又は非置換の炭素数1~20の炭化水素基である。疎水性基を有する第2ポリシロキサンを含有することにより、ケイ素含有組成物はレジストパターンに優れた断面矩形性を付与可能なケイ素含有膜を形成することができる。ケイ素含有組成物は、1種又は2種以上の第2ポリシロキサンを含有することができる。
第2ポリシロキサンは、第2構造単位以外の他の構造単位として、第1ポリシロキサンにおける追加構造単位として示した上記第3構造単位を有していてもよい。第3構造単位を有することにより、レジスト膜への露光時の反射防止作用を発揮して、断面矩形性に優れるレジストパターンを形成することができる。
第2ポリシロキサンは、第2構造単位以外の他の構造単位として、第1ポリシロキサンにおける追加構造単位として示した上記第4構造単位を有していてもよい。第2ポリシロキサンが第4構造単位を有する場合、ケイ素含有組成物により形成されるケイ素含有膜の酸素ガスエッチング耐性を向上させることができる。
溶離液:テトラヒドロフラン
流量:1.0mL/分
試料濃度:1.0質量%
試料注入量:100μL
カラム温度:40℃
検出器:示差屈折計
標準物質:単分散ポリスチレン
特定ポリシロキサンは、各構造単位を与える単量体を用い、常法により合成することができる。例えば第1ポリシロキサンでは第1構造単位を与える単量体及び必要に応じて他の構造単位を与える単量体をシュウ酸等の触媒及び水の存在下、溶媒中で加水分解縮合させることにより、好ましくは生成した加水分解縮合物を含む溶液をオルトギ酸トリメチルエステル等の脱水剤の存在下で溶媒置換等を行うことにより精製することによって合成することができる。加水分解縮合反応等により、各単量体は種類に関係なく第1ポリシロキサン中に取り込まれると考えられる。したがって、合成された第1ポリシロキサンにおける第1構造単位及び他の構造単位の含有割合は、通常、合成反応に用いた各単量体の仕込み量の割合と同等になる。第2ポリシロキサンの場合も、第2構造単位を与える単量体及び必要に応じて他の構造単位を与える単量体を上記と同様に加水分解縮合させることで合成することができる。
溶媒としては特に制限されず、例えばアルコール系溶媒、ケトン系溶媒、エーテル系溶媒、エステル系溶媒、含窒素系溶媒、水等が挙げられる。当該ケイ素含有組成物は、1種又は2種以上の[B]溶媒を含有することができる。
任意成分としては、例えば酸発生剤、塩基性化合物(塩基発生剤を含む)、ラジカル発生剤、界面活性剤、コロイド状シリカ、コロイド状アルミナ、有機ポリマー等が挙げられる。当該ケイ素含有組成物は、1種又は2種以上の任意成分を含有することができる。
当該ケイ素含有組成物の調製方法としては特に限定されず、常法に従って調製することができる。例えば特定ポリシロキサンの溶液と、溶媒と、必要に応じて任意成分とを所定の割合で混合し、好ましくは得られた混合溶液を孔径0.2μm以下のフィルター等でろ過することにより調製することができる。
本実施形態に係る半導体基板の製造方法は、基板に直接又は間接にケイ素含有組成物を塗工してケイ素含有膜を形成する工程(以下、「ケイ素含有膜形成工程」ともいう。)と、上記ケイ素含有膜に直接又は間接にレジスト膜形成用組成物を塗工してレジスト膜形成する工程(以下、「レジスト膜形成工程」ともいう。)と、上記レジスト膜を放射線により露光する工程(以下、「露光工程」ともいう。)と、上記露光されたレジスト膜を現像してレジストパターンを形成する工程(以下、「現像工程」ともいう。)と、上記レジストパターンをマスクとして上記ケイ素含有膜をエッチングしてケイ素含有膜パターンを形成する工程(以下、「ケイ素含有膜パターン形成工程」ともいう。)と、上記ケイ素含有膜パターンをマスクとしたエッチングをする工程(以下、「エッチング工程」)と、上記ケイ素含有膜パターンを塩基性液により除去する工程(以下、「除去工程」)とを備える。半導体基板の製造方法における上記ケイ素含有膜形成工程では、ケイ素含有組成物として上述のケイ素含有組成物を用いる。
本工程では、基板に直接又は間接にケイ素含有組成物を塗工してケイ素含有膜を形成する。本工程により、基板上に直接又は間接にケイ素含有組成物の塗工膜が形成され、この塗工膜を、通常、加熱を行い硬化等させることによりケイ素含有膜が形成される。
本工程では、上記ケイ素含有膜に直接又は間接にレジスト膜形成用組成物を塗工してレジスト膜を形成する。本工程により、ケイ素含有膜上に直接又は間接にレジスト膜が形成される。
本工程では、上記レジスト膜形成用組成物塗工工程により形成されたレジスト膜を放射線により露光する。本工程により、レジスト膜における露光部と未露光部との間で現像液であるアルカリ性溶液への溶解性に差異が生じる。より詳細には、レジスト膜における露光部のアルカリ性溶液への溶解性が高まる。
本工程では、上記露光されたレジスト膜を現像する。上記露光工程により、レジスト膜における露光部と未露光部との間で現像液であるアルカリ性溶液への溶解性に差異が生じていることから、アルカリ現像を行うことでアルカリ性溶液への溶解性が相対的に高い露光部が除去されることにより、レジストパターンが形成される。
本工程では、上記レジストパターンをマスクとして上記ケイ素含有膜をエッチングしてケイ素含有膜パターンを形成する工程。
本工程では、上記ケイ素含有膜パターンをマスクとしたエッチングをする。より具体的には、上記ケイ素含有膜パターン形成工程で得られたケイ素含有膜に形成されたパターンをマスクとした1又は複数回のエッチングを行って、パターニングされた基板を得る。
本工程では、上記ケイ素含有膜パターンを塩基性液で除去する。本工程により、基板上からケイ素含有膜が除去される。また、エッチング後のケイ素含有膜残差を除去することができる。
本工程では、上記ケイ素含有膜形成工程前に、上記基板に直接又は間接に有機下層膜を形成する。本工程は、任意の工程である。本工程により、基板に直接又は間接に有機下層膜が形成される。
ポリシロキサンの重量平均分子量(Mw)は、ゲルパーミエーションクロマトグラフィー(GPC)により、東ソー(株)のGPCカラム(「G2000HXL」2本、「G3000HXL」1本及び「G4000HXL」1本)を使用し、以下の条件により測定した。
(測定条件)
溶離液:テトラヒドロフラン
流量:1.0mL/分
試料濃度:1.0質量%
試料注入量:100μL
カラム温度:40℃
検出器:示差屈折計
標準物質:単分散ポリスチレン
ポリシロキサンの溶液0.5gを250℃で30分間焼成して得られた残渣の質量を測定し、この残渣の質量をポリシロキサンの溶液の質量で除することにより、ポリシロキサンの溶液の濃度(単位:質量%)を算出した。
膜の平均厚みは、分光エリプソメータ(J.A.WOOLLAM社の「M2000D」)を用いて測定した。詳細には、膜の中心を含む5cm間隔の任意の9点の位置で膜厚を測定し、それらの膜厚の平均値を算出して平均厚みとした。
合成例1-1~合成例1-23において、合成に使用した単量体(以下、「単量体(M-1)~(M-15)」ともいう。)を以下に示す。また、以下の合成例1-1~合成例1-23において、モル%は、使用した単量体(M-1)~(M-15)の合計モル数を100モル%とした場合の各単量体についての値を意味する。
反応容器において、上記化合物(M-1)、化合物(M-5)及び化合物(M-7)をモル比率が84/15/1(モル%)となるようプロピレングリコールモノエチルエーテル62質量部に溶解し、単量体溶液を調製した。上記反応容器内を60℃とし、撹拌しながら、9.1質量%シュウ酸水溶液40質量部を20分間かけて滴下した。滴下開始を反応の開始時間とし、反応を4時間実施した。反応終了後、反応容器内を30℃以下に冷却した。冷却した反応溶液にプロピレングリコールモノエチルエーテルを550質量部加えた後、エバポレーターを用いて、水、反応により生成したアルコール類及び余剰のプロピレングリコールモノエチルエーテルを除去して、第1ポリシロキサン(A-1)のプロピレングリコールモノエチルエーテル溶液を得た。第1ポリシロキサン(A-1)のMwは1,700であった。第1ポリシロキサン(A-1)の上記プロピレングリコールモノエチルエーテル溶液中の濃度は、7.2質量%であった。
下記表1に示す種類及び使用量の各単量体を使用した以外は合成例1-1と同様にして、第1ポリシロキサン(A-2)~(A-23)のプロピレングリコールモノエチルエーテル溶液を得た。下記表1中の単量体における「-」は、該当する単量体を使用しなかったことを示す。得られた第1ポリシロキサンのMw及び溶液中の濃度(質量%)を下記表1に併せて示す。
反応容器において、上記化合物(M-1)及び化合物(M-2)をモル比率が50/50(モル%)となるようプロピレングリコールモノエチルエーテル62質量部に溶解し、単量体溶液を調製した。上記反応容器内を60℃とし、撹拌しながら、9.1質量%シュウ酸水溶液40質量部を20分間かけて滴下した。滴下開始を反応の開始時間とし、反応を4時間実施した。反応終了後、反応容器内を30℃以下に冷却した。冷却した反応溶液にプロピレングリコールモノエチルエーテルを550質量部加えた後、エバポレーターを用いて、水、反応により生成したアルコール類及び余剰のプロピレングリコールモノエチルエーテルを除去して、第2ポリシロキサン(B-1)のプロピレングリコールモノエチルエーテル溶液を得た。第2ポリシロキサン(B-1)のMwは1,900であった。第2ポリシロキサン(B-1)の上記プロピレングリコールモノエチルエーテル溶液中の濃度は、7.1質量%であった。
下記表1に示す種類及び使用量の各単量体を使用した以外は合成例2-1と同様にして、第2ポリシロキサン(B-2)~(B-10)のプロピレングリコールモノエチルエーテル溶液を得た。下記表1中の単量体における「-」は、該当する単量体を使用しなかったことを示す。得られた第2ポリシロキサンのMw及び溶液中の濃度(質量%)を下記表1に併せて示す。
ケイ素含有組成物の調製に用いた溶媒を以下に示す。なお、以下の実施例1~38及び比較例1~2においては、特に断りのない限り、質量部は使用した成分の合計質量を10,000質量部とした場合の値を示す。
C-1:プロピレングリコールモノエチルエーテル
第1ポリシロキサンとしての(A-1)90質量部、第2ポリシロキサンとしての(B-1)10質量部及び溶媒としての(C-1)9900質量部(2種のポリシロキサンの溶液に含まれる溶媒も含む。)を混合し、得られた溶液を孔径0.2μmのポリテトラフルオロエチレンのフィルターでろ過して、ArF露光用ケイ素含有組成物(J-1)を調製した。
下記表2に示す種類及び配合量の各成分を使用した以外は実施例1と同様にして、実施例2~37のArF露光用ケイ素含有組成物(J-2)~(J-37)、並びに比較例1~2のArF露光用ケイ素含有組成物(j-1)及び(j-2)を調製した。
第1ポリシロキサンとしての(A-23)90質量部、第2ポリシロキサンとしての(B-1)10質量部及び溶媒としての(C-1)9900質量部(2種のポリシロキサンの溶液に含まれる溶媒も含む。)を混合し、得られた溶液を孔径0.2μmのポリテトラフルオロエチレンのフィルターでろ過して、EUV露光用ケイ素含有組成物(J-38)を調製した。
上記調製した組成物を用いて、以下の方法により、パターン矩形性及び膜除去性を評価した。評価結果を下記表3に示す。
12インチシリコンウェハ上に、有機下層膜形成用材料(JSR(株)の「HM8006」)をスピンコーター(東京エレクトロン(株)の「CLEAN TRACK ACT12」)による回転塗工法により塗工した後、250℃で60秒間加熱を行うことにより平均厚み100nmの有機下層膜を形成した。この有機下層膜上に、上記調製したArF露光用ケイ素含有組成物を塗工し、220℃で60秒間加熱した後、23℃で30秒間冷却することにより平均厚み20nmのケイ素含有膜を形成した。上記形成したケイ素含有膜上に、感放射線性樹脂組成物(JSR(株)の「ARF AR2772JN」)を塗工し、90℃で60秒間加熱した後、23℃で30秒間冷却することにより平均厚み100nmのレジスト膜を形成した。次いで、ArF液浸露光装置(NIKON(株)の「S610C」)を使用し、NA:1.30、Dipoleの光学条件にて、40nmライン/80nmピッチ形成用のマスクサイズのマスクを介して露光後、基板を100℃で60秒間加熱を行い、次いで23℃で60秒間冷却した。その後、2.38質量%のTMAH水溶液(20℃~25℃)を用い、パドル法により現像した後、水で洗浄し、乾燥することにより、レジストパターンが形成された評価用基板を得た。上記評価用基板のレジストパターンの測長及び断面形状の観察には走査型電子顕微鏡(日立ハイテクノロジーズ(株)の「CG-4000」)を用いた。上記評価用基板において、線幅40nmの1対1ラインアンドスペースが形成される露光量を最適露光量とした。パターン矩形性は、パターンの断面形状が矩形である場合を「A」(良好)と、パターンの断面に裾引きがある場合を「B」(やや良好)と、パターンに残渣(欠陥)がある場合を「C」(不良)と評価した。
EUV露光用レジスト組成物(R-1)は、4-ヒドロキシスチレンに由来する構造単位(1)、スチレンに由来する構造単位(2)及び4-t-ブトキシスチレンに由来する構造単位(3)(各構造単位の含有割合は、(1)/(2)/(3)=65/5/30(モル%))を有する重合体100質量部と、感放射線性酸発生剤としてのトリフェニルスルホニウムトリフオロメタンスルホネート1.0質量部と、溶媒としての乳酸エチル4,400質量部及びプロピレングリコールモノメチルエーテルアセテート1,900質量部とを混合し、得られた溶液を孔径0.2μmのフィルターでろ過することで得た。
12インチシリコンウェハ上に、有機下層膜形成用材料(JSR(株)の「HM8006」)をスピンコーター(東京エレクトロン(株)の「CLEAN TRACK ACT12」)による回転塗工法により塗工した後、250℃で60秒間加熱を行うことにより平均厚み100nmの有機下層膜を形成した。この有機下層膜上に、上記調製したEUV露光用ケイ素含有組成物を塗工し、220℃で60秒間加熱した後、23℃で30秒間冷却することにより平均厚み20nmのケイ素含有膜を形成した。上記形成したケイ素含有膜上に、EUV露光用レジスト組成物(R-1)を塗工し、130℃で60秒間加熱した後、23℃で30秒間冷却することにより平均厚み50nmのレジスト膜を形成した。次いで、EUVスキャナー(ASML社の「TWINSCAN NXE:3300B」(NA0.3、シグマ0.9、クアドルポール照明、ウェハ上寸法が線幅25nmの1対1ラインアンドスペースのマスク)を用いてレジスト膜に極端紫外線を照射した。極端紫外線の照射後、基板を110℃で60秒間加熱を行い、次いで23℃で60秒間冷却した。その後、2.38質量%のTMAH水溶液(20℃~25℃)を用い、パドル法により現像した後、水で洗浄し、乾燥することにより、レジストパターンが形成された評価用基板を得た。上記評価用基板のレジストパターンの測長及び観察には上記走査型電子顕微鏡を用いた。上記評価用基板において、線幅25nmの1対1ラインアンドスペースが形成される露光量を最適露光量とした。パターン矩形性は、パターンの断面形状が矩形である場合を「A」(良好)と、パターンの断面に裾引きがある場合を「B」(やや良好)と、パターンに残渣(欠陥)がある場合を「C」(不良)と評価した。
12インチシリコンウェハ上に、上記調製したArF露光用ケイ素含有組成物及びEUV露光用ケイ素含有組成物をそれぞれ塗工し、220℃で60秒間加熱した後、23℃で30秒間冷却することにより平均厚み20nmのケイ素含有膜を形成した。上記得られた各ケイ素含有膜付き基板を、65℃に加温した除去液(25質量%アンモニア水溶液/30質量%過酸化水素水/水=1/1/5(体積比)混合水溶液)に5分間浸漬した後、水で洗浄し、乾燥することにより、評価用基板を得た。また、上記得られた各ケイ素含有膜付き基板を、65℃に加温した除去液(25質量%アンモニア水溶液/30質量%過酸化水素水/水=1/1/5(体積比)混合水溶液)に10分間浸漬した後、水で洗浄し、乾燥することにより、評価用基板を得た。上記得られた各評価用基板の断面について、電界放出形走査電子顕微鏡((株)日立ハイテクノロジーズの「SU8220」)を用いて観察し、除去液に5分間浸漬した場合にケイ素含有膜が残存していない場合は「A」(良好)と、除去液に5分間浸漬した場合にケイ素含有膜が残存しているが除去液に10分間浸漬した場合にケイ素含有膜が残存していない場合は「B」(やや良好)と、除去液に5分間及び10分間浸漬した場合にケイ素含有膜が残存している場合は「C」(不良)と評価した。
Claims (16)
- レジストパターンをマスクとしたエッチングによりパターンを形成後、上記形成されたパターンをマスクとしたエッチングをし、塩基性液により除去するレジスト下層膜を形成するためのケイ素含有組成物であって、
2種のポリシロキサンと、
溶媒とを含み、
上記2種のポリシロキサンが、それぞれ、
エステル結合、カーボネート構造及びシアノ基からなる群より選択される少なくとも1種を含む基を有する第1ポリシロキサンと、
置換又は非置換の炭素数1~20の炭化水素基を有する第2ポリシロキサンである、ケイ素含有組成物。 - 上記式(1)中のXが、エステル結合を含む請求項2に記載のケイ素含有組成物。
- 上記第1ポリシロキサンを構成する全構造単位中に占める上記第1構造単位の含有割合が0.5モル%以上40モル%以下である請求項2~4のいずれか1項に記載のケイ素含有組成物。
- 上記第2ポリシロキサンを構成する全構造単位中に占める上記第2構造単位の含有割合が10モル%以上100モル%以下である請求項6に記載のケイ素含有組成物。
- 上記第1ポリシロキサンを構成する全構造単位中に占める上記第3構造単位の含有割合が5モル%以上50モル%以下である請求項8に記載のケイ素含有組成物。
- 上記第1ポリシロキサンを構成する全構造単位中に占める上記第4構造単位の含有割合が、40モル%以上95モル%以下である請求項10に記載のケイ素含有組成物。
- 上記第1ポリシロキサン及び上記第2ポリシロキサンの合計質量に占める上記第1ポリシロキサンの含有割合が40質量%以上99質量%以下である請求項1~11のいずれか1項に記載のケイ素含有組成物。
- 上記第1ポリシロキサン及び上記第2ポリシロキサンの合計質量に占める上記第2ポリシロキサンの含有割合が1質量%以上60質量%以下である請求項1~12のいずれか1項に記載のケイ素含有組成物。
- 基板に直接又は間接に請求項1~13のいずれか1項に記載のケイ素含有組成物を塗工してケイ素含有膜を形成する工程と、
上記ケイ素含有膜に直接又は間接にレジスト膜形成用組成物を塗工してレジスト膜を形成する工程と、
上記レジスト膜を放射線により露光する工程と、
上記露光されたレジスト膜を現像してレジストパターンを形成する工程と、
上記レジストパターンをマスクとして上記ケイ素含有膜をエッチングしてケイ素含有膜パターンを形成する工程と、
上記ケイ素含有膜パターンをマスクとしたエッチングをする工程と、
上記ケイ素含有膜パターンを塩基性液により除去する工程と
を含む半導体基板の製造方法。 - 上記ケイ素含有膜形成工程より前に、上記基板に直接又は間接に有機下層膜を形成する工程をさらに含む請求項14に記載の半導体基板の製造方法。
- 上記塩基性液が、塩基化合物及び水を含む液、又は塩基化合物、過酸化水素及び水を含む液である請求項14又は15に記載の半導体基板の製造方法。
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| JP2017095643A (ja) * | 2015-11-27 | 2017-06-01 | 信越化学工業株式会社 | ケイ素含有縮合物、ケイ素含有レジスト下層膜形成用組成物、及びパターン形成方法 |
| JP2017120359A (ja) * | 2015-12-24 | 2017-07-06 | Jsr株式会社 | 半導体用ケイ素含有膜形成用材料及びパターン形成方法 |
| WO2017169487A1 (ja) * | 2016-03-30 | 2017-10-05 | Jsr株式会社 | レジストプロセス用膜形成材料及びパターン形成方法 |
| JP2018036631A (ja) * | 2016-09-01 | 2018-03-08 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC | シリコン含有下層 |
| JP2019536102A (ja) * | 2016-11-17 | 2019-12-12 | フジフイルム エレクトロニック マテリアルズ ユー.エス.エー., インコーポレイテッド | 剥離方法 |
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| WO2012039337A1 (ja) | 2010-09-21 | 2012-03-29 | 日産化学工業株式会社 | 保護された脂肪族アルコールを含有する有機基を有するシリコン含有レジスト下層膜形成組成物 |
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- 2021-05-11 KR KR1020227038554A patent/KR20230016173A/ko not_active Ceased
- 2021-05-11 JP JP2022524399A patent/JPWO2021235273A1/ja active Pending
- 2021-05-17 TW TW110117791A patent/TWI887415B/zh active
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2017095643A (ja) * | 2015-11-27 | 2017-06-01 | 信越化学工業株式会社 | ケイ素含有縮合物、ケイ素含有レジスト下層膜形成用組成物、及びパターン形成方法 |
| JP2017120359A (ja) * | 2015-12-24 | 2017-07-06 | Jsr株式会社 | 半導体用ケイ素含有膜形成用材料及びパターン形成方法 |
| WO2017169487A1 (ja) * | 2016-03-30 | 2017-10-05 | Jsr株式会社 | レジストプロセス用膜形成材料及びパターン形成方法 |
| JP2018036631A (ja) * | 2016-09-01 | 2018-03-08 | ローム アンド ハース エレクトロニック マテリアルズ エルエルシーRohm and Haas Electronic Materials LLC | シリコン含有下層 |
| JP2019536102A (ja) * | 2016-11-17 | 2019-12-12 | フジフイルム エレクトロニック マテリアルズ ユー.エス.エー., インコーポレイテッド | 剥離方法 |
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| TWI887415B (zh) | 2025-06-21 |
| US20230093664A1 (en) | 2023-03-23 |
| KR20230016173A (ko) | 2023-02-01 |
| TW202202558A (zh) | 2022-01-16 |
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