WO2018198663A1 - n型シリコン単結晶の製造方法、n型シリコン単結晶のインゴット、シリコンウェーハ、およびエピタキシャルシリコンウェーハ - Google Patents
n型シリコン単結晶の製造方法、n型シリコン単結晶のインゴット、シリコンウェーハ、およびエピタキシャルシリコンウェーハ Download PDFInfo
- Publication number
- WO2018198663A1 WO2018198663A1 PCT/JP2018/013362 JP2018013362W WO2018198663A1 WO 2018198663 A1 WO2018198663 A1 WO 2018198663A1 JP 2018013362 W JP2018013362 W JP 2018013362W WO 2018198663 A1 WO2018198663 A1 WO 2018198663A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- single crystal
- silicon single
- mωcm
- less
- silicon
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/02—Single-crystal growth by pulling from a melt, e.g. Czochralski method adding crystallising materials or reactants forming it in situ to the melt
- C30B15/04—Single-crystal growth by pulling from a melt, e.g. Czochralski method adding crystallising materials or reactants forming it in situ to the melt adding doping materials, e.g. for n-p-junction
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/14—Heating of the melt or the crystallised materials
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/20—Controlling or regulating
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
- C30B15/20—Controlling or regulating
- C30B15/206—Controlling or regulating the thermal history of growing the ingot
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/02—Elements
- C30B29/06—Silicon
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02002—Preparing wafers
Definitions
- the present invention relates to an n-type silicon single crystal manufacturing method, an n-type silicon single crystal ingot, a silicon wafer, and an epitaxial silicon wafer.
- a low breakdown voltage power MOSFET Metal Oxide Semi Conductor Field Effect Transistor
- a power device for portable equipment has a certain electric resistance inside when energized. Itself consumes power according to the current flowing through it. Therefore, if the internal resistance when the low withstand voltage power MOSFET is energized can be reduced, the power consumption of the portable device can be reduced.
- low resistivity an n-type silicon single crystal having a low electrical resistivity (hereinafter referred to as low resistivity) in order to reduce the resistance when the low breakdown voltage power MOSFET is energized.
- the electrical resistivity (hereinafter referred to as resistivity) is controlled to a target value so that the electrical resistivity of the silicon single crystal becomes constant as a whole. .
- resistivity the electrical resistivity
- the resistivity in the tail portion is increased by paying attention to the fact that the dopant concentration increases in the tail portion just before the end of the pulling of the silicon single crystal and abnormal growth occurs due to compositional supercooling.
- n-type dopants such as red phosphorus and arsenic that are volatile dopants evaporate during the pulling, There is a problem that a silicon single crystal having a desired low resistivity range cannot be produced, or that a dislocation is generated at the start of the straight body of the silicon single crystal as the amount of n-type dopant added increases. In this case, the seed crystal is deposited on the melt in the crucible and then pulled again. However, if the pulling is repeated, there is a problem that the manufacturing cost of the silicon single crystal ingot increases.
- An object of the present invention is to provide an n-type silicon single crystal manufacturing method capable of obtaining a low-resistivity n-type silicon single crystal without increasing the manufacturing cost, an n-type silicon single crystal ingot, a silicon wafer, and An object is to provide an epitaxial silicon wafer.
- the present invention pays attention to the occurrence of dislocation at the straight barrel start position, and the resistivity at the straight barrel start position is set to a resistivity larger than the target value, and then the resistivity is successively lowered.
- the gist is to prevent the occurrence of dislocation at the starting position of the straight body.
- the method for producing an n-type silicon single crystal according to the present invention is an n-type in which a silicon single crystal is pulled up and grown by a Czochralski method from a silicon melt containing red phosphorus, which is a volatile dopant, as a main dopant.
- a method for producing a silicon single crystal wherein the electrical resistivity of the silicon single crystal at a straight body start position is controlled to 0.8 m ⁇ cm or more and 1.05 m ⁇ cm or less, and then the silicon single crystal is pulled up and grown.
- the electrical resistivity of the silicon single crystal is sequentially decreased, and the electrical resistivity of a part of the silicon single crystal is set to 0.5 m ⁇ cm or more and 0.7 m ⁇ cm or less.
- the present invention it is possible to prevent the occurrence of dislocation at the straight barrel portion start position by setting the resistivity at the straight barrel portion start position of the silicon single crystal to 0.8 m ⁇ cm or more and 1.05 m ⁇ cm or less. Therefore, it is possible to manufacture a silicon single crystal having a low resistivity doped with red phosphorus without increasing the manufacturing cost by preventing the silicon single crystal from being pulled again.
- the n-type silicon single crystal ingot of the present invention is characterized in that the electrical resistivity of a part of the silicon single crystal containing red phosphorus as a main dopant is 0.5 m ⁇ cm or more and less than 0.6 m ⁇ cm.
- the silicon wafer of the present invention is cut out from the n-type silicon single crystal ingot, and has an electrical resistivity of 0.5 m ⁇ cm or more and less than 0.6 m ⁇ cm.
- the epitaxial silicon wafer of the present invention is characterized in that an epitaxially grown film is formed on the surface of the silicon wafer.
- low resistivity silicon single crystal ingots, silicon wafers, and epitaxial silicon wafers doped with red phosphorus having a resistivity of 0.5 m ⁇ cm or more and less than 0.6 m ⁇ cm can be manufactured at low cost. Therefore, it can be provided to customers at a low price.
- the method for producing an n-type silicon single crystal of the present invention is a method for producing a silicon single crystal in which a silicon single crystal is pulled and grown from a silicon melt containing arsenic, which is a volatile dopant, as a main dopant by the Czochralski method. Then, the electrical resistivity at the starting position of the straight body portion of the silicon single crystal is controlled to 1.9 m ⁇ cm or more and 2.3 m ⁇ cm or less, and thereafter, as the silicon single crystal is pulled up and grown, the silicon single crystal The electrical resistivity is lowered, and the electrical resistivity of a part of the silicon single crystal is 1.2 m ⁇ cm or more and 1.4 m ⁇ cm or less. According to the present invention, the low resistivity silicon single crystal doped with arsenic can be manufactured without increasing the manufacturing cost by the same operation and effect as described above.
- the n-type silicon single crystal ingot of the present invention is characterized in that the electrical resistivity of a part of the silicon single crystal containing arsenic as a main dopant is 1.2 m ⁇ cm or more and 1.4 m ⁇ cm or less.
- the silicon wafer of the present invention is cut out from the n-type silicon single crystal ingot, and has an electrical resistivity of 1.2 m ⁇ cm or more and 1.4 m ⁇ cm or less.
- the epitaxial silicon wafer of the present invention is characterized in that an epitaxially grown film is formed on the surface of the silicon wafer. According to the present invention, the low resistivity silicon single crystal ingot and silicon wafer doped with arsenic can be provided to customers at a low price by the same operations and effects as described above.
- the schematic diagram which shows an example of the structure of the pulling apparatus of the silicon single crystal which concerns on embodiment of this invention.
- the graph which shows the straight body length of the silicon single crystal at the time of using red phosphorus in the said embodiment as a dopant, and the relationship of a resistivity.
- the graph which shows the relationship between the straight body length and the occupation rate [%] in the silicon single crystal when red phosphorus is used as a dopant in the above embodiment (denominator: total number of tries, numerator: dislocation or total number of dislocation try) .
- the graph which shows the straight body length of the silicon single crystal at the time of using arsenic in the said embodiment as a dopant, and the relationship of a resistivity.
- the graph which shows the relationship between the straight body length and the occupation rate [%] (denominator: total number of tries, numerator: dislocation-ized or total number of non-dislocation try) in the silicon single crystal when arsenic is used as a dopant in the embodiment.
- FIG. 1 is a schematic diagram showing an example of the structure of a silicon single crystal pulling device 1 to which the method for producing an n-type silicon single crystal according to the embodiment of the present invention can be applied. It is shown.
- the pulling device 1 includes a chamber 2 that forms an outer shell, and a crucible 3 that is disposed at the center of the chamber 2.
- the crucible 3 has a double structure composed of an inner quartz crucible 3A and an outer graphite crucible 3B, and is fixed to the upper end of a support shaft 4 that can rotate and move up and down.
- the inner diameter of the quartz crucible 3A inside the crucible 3 is 1.7 times or more and 2.3 times or less than the diameter of the straight cylinder when the silicon single crystal 10 is pulled up.
- the inner diameter of the quartz crucible 3A is 2.1 times or more and 2.3 times or less of the straight cylinder diameter of the silicon single crystal 10. Is preferable.
- the inner diameter of the quartz crucible 3A is 1.7 times or more and 2.0 times or less of the straight cylinder diameter of the silicon single crystal 10. Is preferred.
- a resistance heating heater 5 surrounding the crucible 3 is provided outside the crucible 3, and a heat insulating material 6 is provided along the inner surface of the chamber 2 outside the crucible 3.
- a lifting shaft 7 such as a wire that rotates coaxially with the support shaft 4 in the reverse direction or in the same direction at a predetermined speed is provided above the crucible 3.
- a seed crystal 8 is attached to the lower end of the pulling shaft 7.
- a cylindrical heat shielding plate 12 is disposed in the chamber 2.
- the heat shielding plate 12 shields high temperature radiant heat from the silicon melt 9 in the crucible 3, the heater 5, and the side wall of the crucible 3 from the growing silicon single crystal 10, and is a solid liquid that is a crystal growth interface. For the vicinity of the interface, it plays the role of suppressing the diffusion of heat to the outside and controlling the temperature gradient in the pulling axis direction of the single crystal central part and the single crystal outer peripheral part.
- a gas inlet 13 for introducing an inert gas such as Ar gas into the chamber 2 is provided at the upper portion of the chamber 2.
- an exhaust port 14 through which a gas in the chamber 2 is sucked and discharged by driving a vacuum pump (not shown).
- the inert gas introduced into the chamber 2 from the gas inlet 13 descends between the growing silicon single crystal 10 and the heat shielding plate 12, and the lower end of the heat shielding plate 12 and the liquid surface of the silicon melt 9. After passing through the gap (liquid level gap), the gas flows toward the outside of the heat shielding plate 12 and further to the outside of the crucible 3, and then descends outside the crucible 3 and is discharged from the exhaust port 14.
- a solid material such as polycrystalline silicon filled in the crucible 3 is used for the heater 5 while the chamber 2 is maintained in an inert gas atmosphere under reduced pressure.
- the silicon melt 9 is formed by melting by heating.
- the pulling shaft 7 is lowered to immerse the seed crystal 8 in the silicon melt 9, and the crucible 3 and the pulling shaft 7 are rotated in a predetermined direction while the pulling shaft 7 is gradually pulled up to grow the silicon single crystal 10 connected to the seed crystal 8.
- red phosphorus or arsenic is used as a main dopant in the silicon melt 9 at the beginning of pulling. It can manufacture by adding or adding suitably during raising. When red phosphorus or arsenic is the main dopant, 50% by mass or more of the n-type dopant is red phosphorus or arsenic, but other dopants may be added.
- the resistivity is controlled to 0.80 m ⁇ cm or more and 1.05 m ⁇ cm or less at the straight body portion start position of the silicon single crystal 10, and then, as the silicon single crystal 10 is pulled and grown, The resistivity of the silicon single crystal 10 is successively lowered, and finally, the silicon single crystal 10 having 0.5 m ⁇ cm or more and 0.7 m ⁇ cm or less, particularly less than 0.6 m ⁇ cm at the last part of the straight body length is obtained.
- the resistivity is controlled to 1.90 m ⁇ cm or more and 2.30 m ⁇ cm or less at the start of the straight body portion of the silicon single crystal 10, and then the silicon single crystal 10 is pulled up and grown. Then, the resistivity of the silicon single crystal 10 is successively lowered, and finally a silicon single crystal having a value of 1.2 m ⁇ cm or more and 1.4 m ⁇ cm or less is obtained.
- the ingot of the silicon single crystal 10 of this embodiment can be pulled up under general pulling conditions.
- a dopant is added during the pulling, or an increase in the dopant concentration due to a segregation phenomenon accompanying the pulling is used.
- the amount of inert gas introduced into the chamber 2 is changed to suppress evaporation of the dopant, or the pressure inside the chamber 2 is changed.
- the Ar flow rate is set to 50 L / min to 150 L. / Min, and the furnace pressure is 40 kPa to 80 kPa.
- the evaporation of the dopant is promoted and offset with the concentration of the dopant due to segregation accompanying the progress of the growth of the silicon single crystal 10.
- the Ar flow rate is set to 50 L / min to 200 L / min, and the furnace pressure is set to 20 kPa to 80 kPa.
- a part of the silicon single crystal 10 pulled by such a pulling device 1 has a resistivity of 0.5 m ⁇ cm or more and less than 0.6 m ⁇ cm at a portion close to the tail of the silicon single crystal 10 when red phosphorus is used as a dopant.
- An ingot of the silicon single crystal 10 is obtained.
- a silicon wafer having a resistivity of 0.5 m ⁇ cm or more and less than 0.6 m ⁇ cm can be obtained by cutting the portion into a silicon wafer with a wire saw or the like and subjecting the cut silicon wafer to a lapping step and a polishing step.
- an epitaxial growth film is formed on the surface of the silicon wafer to manufacture the epitaxial silicon wafer and ship it to the customer.
- the silicon single crystal 10 having a resistivity of 1.2 m ⁇ cm or more and 1.4 m ⁇ cm or less is obtained in a portion near the tail of the silicon single crystal 10.
- the part is cut into a silicon wafer with a wire saw or the like, and the cut silicon wafer is subjected to a lapping process and a polishing process, and then shipped to a customer.
- the customer manufactures the semiconductor by forming an epitaxially grown film as necessary.
- the ratio of the inner diameter of the crucible 3 to the crystal diameter is 1.8 to 2.3, and the charge amount is The pulling speed was 0.3 mm / min to 1.0 mm / min, and the crystal rotation speed was 9 rpm to 17 rpm.
- the argon gas flow rate was 50 L / min to 150 L / min, and the furnace pressure was 40 kPa to 80 kPa.
- the Ar flow rate was 50 L / min to 200 L / min, and the furnace pressure was 20 kPa to 80 kPa.
- the presence or absence of dislocation formation in each case was also examined.
- the results are shown in Table 2 and FIG.
- the diameter of the silicon single crystal was controlled in a range of 201 mm or more and 230 mm or less, and a single crystal of a 200 mm wafer was obtained.
- the straight cylinder pass length is the value obtained by dividing the length of the straight cylinder region where the resistivity is pass and no dislocation by the total length of the straight cylinder
- the occupation ratio is the number of dislocation try / The total number of tries or the total number of dislocation-free tries / the total number of tries.
- the silicon single crystal of Comparative Example 1 can prevent the occurrence of dislocation with a high probability of dislocation generation from the straight barrel portion start position to 80 mm as high as 5%.
- the resistivity is only reduced to 0.7 m ⁇ cm, and a low resistivity silicon single crystal having a resistivity of 0.7 m ⁇ cm or less cannot be manufactured.
- Table 1 and FIG. 2 in the silicon single crystal of Comparative Example 2, all of the dislocations occurred from the starting position of the straight barrel portion to the position of 20% of the straight barrel length, and a silicon single crystal was produced. I could't.
- the silicon single crystal of Example 1 can have a resistivity of 0.7 m ⁇ cm or less at a position 60% from the start position of the straight body portion, and has a presence at a position of 80 mm from the start position of the straight body portion. It was confirmed that the dislocation generation rate can be suppressed to 22%, and a low resistivity silicon single crystal of 0.7 m ⁇ cm or less can be produced. In particular, it was confirmed that a single crystal having an extremely low resistivity of less than 0.6 m ⁇ cm, which could not be produced so far, can be produced with a straight body length of 90% or more.
- the silicon single crystal of Example 2 can have a resistivity of 0.7 m ⁇ cm or less at a position of 30% from the start position of the straight body portion, and also has dislocation at a position of 80 mm from the start position of the straight body portion. It was confirmed that the generation rate can be suppressed to 44% and a silicon single crystal having a low resistivity of 0.7 m ⁇ cm or less is manufactured. In particular, it was confirmed that a single crystal having an extremely low resistivity of less than 0.6 m ⁇ cm, which could not be produced so far, can be produced with a straight body length of 65% or more.
- the silicon single crystal of Comparative Example 3 has a low occurrence rate of dislocation from the straight barrel start position to 80 mm as 6%, and can prevent the occurrence of dislocation.
- the resistivity is only reduced to 1.5 m ⁇ cm, and a low resistivity silicon single crystal having a resistivity of 1.4 m ⁇ cm or less cannot be manufactured.
- Table 3 and FIG. 4 in the silicon single crystal of Comparative Example 4, all of the dislocations occurred from the starting position of the straight body part to the position of the straight body length of 20%, producing a silicon single crystal. I could't.
- the silicon single crystal of Example 3 can have a resistivity of 1.4 m ⁇ cm or less at a position 85% from the straight barrel start position, and has a presence at a position of 80 mm from the straight barrel start position. It was confirmed that the rate of occurrence of dislocation can be suppressed to 9%, and a low resistivity silicon single crystal of 1.4 m ⁇ cm or less can be produced. Similarly, in the silicon single crystal of Example 4, the resistivity can be reduced to 1.4 m ⁇ cm or less at a position 55% from the start position of the straight body portion, and the dislocation is formed at a position 80 mm from the start position of the straight body portion. It was confirmed that the generation rate can be suppressed to 38%, and a low resistivity silicon single crystal of 1.4 m ⁇ cm or less can be produced.
- the resistivity at the straight barrel portion start position of the silicon single crystal 10 is 0.80 m ⁇ cm or more
- the resistivity of the silicon single crystal 10 is reduced to 0 by sequentially decreasing the resistivity of the silicon single crystal 10 as the silicon single crystal 10 is pulled and grown.
- the resistivity at the start position of the straight body of the silicon single crystal is 1.90 m ⁇ cm or more and 2.30 m ⁇ cm or less. Then, as the silicon single crystal 10 is pulled up and grown, the resistivity of the silicon single crystal is sequentially lowered, so that a part of the silicon single crystal 10 is 1.2 m ⁇ cm or more and 1.4 m ⁇ cm or less. And the occurrence of dislocations in the silicon single crystal 10 could be suppressed.
- SYMBOLS 1 Lifting device, 2 ... Chamber, 3 ... Crucible crucible, 3A ... Quartz crucible, 3B ... Graphite crucible, 4 ... Support shaft, 5 ... Heater, 6 ... Heat insulating material, 7 ... Lifting shaft, 8 ... Seed crystal, 9 ... Silicon Melt, 10 ... silicon single crystal, 12 ... heat shielding plate, 13 ... gas inlet, 14 ... exhaust.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
Description
携帯機器自体の消費電力を低減させるには、携帯機器の内部に搭載される半導体デバイスの消費電力を低減させることが必要である。
したがって、低耐圧パワーMOSFETが通電状態となったときの内部抵抗を小さくすることができれば、携帯機器の消費電力を低減させることが可能となる。そのような背景から、低耐圧パワーMOSFETが通電状態となったときの抵抗を小さくするために、低電気抵抗率(以下低抵抗率と称す)のn型シリコン単結晶が強く求められている。
ところで、このような低抵抗率のシリコン単結晶は、チョクラルスキー法等により引き上げて製造する場合、引き上げ途中で有転位化が発生し易いということが知られている。
特許文献1には、シリコン単結晶の引き上げ終了間際のテール部分において、ドーパントの濃度が高くなり、組成的過冷却に起因する異常成長が発生する点に着目して、テール部分における抵抗率を上げていき、テール部分における有転位化の発生を防止する技術が開示されている。
この場合、種結晶を坩堝内融液に着液させ、再度引き上げを行うこととなるが、引き上げを繰り返せば、シリコン単結晶のインゴットの製造コストが上昇するという課題がある。
本発明のシリコンウェーハは、前記n型シリコン単結晶のインゴットから切り出され、電気抵抗率が0.5mΩcm以上、0.6mΩcm未満であることを特徴とする。
本発明のエピタキシャルシリコンウェーハは、前記シリコンウェーハの表面に、エピタキシャル成長膜を形成したことを特徴とする。
この発明によれば、抵抗率が0.5mΩcm以上、0.6mΩcm未満という、赤リンをドーピングした低抵抗率のシリコン単結晶のインゴット、シリコンウェーハ、エピタキシャルシリコンウェーハを、低コストで製造することができるため、低価格で顧客に提供することができる。
この発明によれば、前記と同様の作用および効果により、製造コストが上昇することなく、ヒ素をドーピングした低抵抗率のシリコン単結晶を製造することができる。
本発明のシリコンウェーハは、前記n型シリコン単結晶のインゴットから切り出され、電気抵抗率が1.2mΩcm以上、1.4mΩcm以下であることを特徴とする。
本発明のエピタキシャルシリコンウェーハは、前記シリコンウェーハの表面に、エピタキシャル成長膜を形成したことを特徴とする。
この発明によれば、前記と同様の作用および効果により、ヒ素をドーピングした低抵抗率のシリコン単結晶のインゴットおよびシリコンウェーハを、低価格で顧客に提供することができる。
図1には、本発明の実施形態に係るn型シリコン単結晶の製造方法を適用できるシリコン単結晶の引き上げ装置1の構造の一例を表す模式図が示されている。引き上げ装置1は、外郭を構成するチャンバ2と、チャンバ2の中心部に配置されるルツボ3とを備える。
ルツボ3は、内側の石英ルツボ3Aと、外側の黒鉛ルツボ3Bとから構成される二重構造であり、回転および昇降が可能な支持軸4の上端部に固定されている。
具体的には、シリコン単結晶10の直胴径が201mm以上、230mm以下である場合、石英ルツボ3Aの内径は、シリコン単結晶10の直胴径の2.1倍以上、2.3倍以下とするのが好ましい。一方、シリコン単結晶10の直胴径が301mm以上、330mm以下である場合、石英ルツボ3Aの内径は、シリコン単結晶10の直胴径の1.7倍以上、2.0倍以下とするのが好ましい。
ルツボ3の上方には、支持軸4と同軸上で逆方向または同一方向に所定の速度で回転するワイヤなどの引き上げ軸7が設けられている。この引き上げ軸7の下端には種結晶8が取り付けられている。
熱遮蔽板12は、育成中のシリコン単結晶10に対して、ルツボ3内のシリコン融液9やヒータ5やルツボ3の側壁からの高温の輻射熱を遮断するとともに、結晶成長界面である固液界面の近傍に対しては、外部への熱の拡散を抑制し、単結晶中心部および単結晶外周部の引き上げ軸方向の温度勾配を制御する役割を担う。
ガス導入口13からチャンバ2内に導入された不活性ガスは、育成中のシリコン単結晶10と熱遮蔽板12との間を下降し、熱遮蔽板12の下端とシリコン融液9の液面との隙間(液面Gap)を経た後、熱遮蔽板12の外側、さらにルツボ3の外側に向けて流れ、その後にルツボ3の外側を下降し、排気口14から排出される。
前述した引き上げ装置1を用いて本実施形態のシリコン単結晶10を製造する場合、シリコン融液9中に、赤リンまたはヒ素を主たるドーパントとして、引き上げ当初に添加したり、または引き上げ中に適宜添加することにより、製造することができる。赤リンまたはヒ素を主たるドーパントとする場合、n型ドーパントのうち50質量%以上を赤リンまたはヒ素とするが、さらに他のドーパントを添加してもよい。
赤リンをドーパントとした場合では、シリコン単結晶10の直胴部開始位置で、抵抗率を0.80mΩcm以上、1.05mΩcm以下に制御し、その後、シリコン単結晶10を引き上げて成長させるにつれて、順次シリコン単結晶10の抵抗率を下げていき、最終的に0.5mΩcm以上、0.7mΩcm以下、特に直胴長最後部では0.6mΩcm未満のシリコン単結晶10を得る。
本実施形態のシリコン単結晶10のインゴットは、一般的な引き上げ条件で引き上げることができる。その際、ルツボ3内のシリコン融液9における赤リンやヒ素といったドーパント濃度を増加させる手段としては、引き上げ中にドーパントを添加したり、引き上げに伴う偏析現象によるドーパント濃度の上昇を利用したり、チャンバ2内に導入される不活性ガスの導入量を変化させてドーパントの蒸発を抑制したり、チャンバ2内の圧力を変化させることが挙げられる。
一方、シリコン単結晶10の直胴部引き上げの後半においては、ドーパントの蒸発を促進し、シリコン単結晶10の育成の進行に伴う偏析によるドーパント濃度の濃化と相殺させて、ルツボ3内のシリコン融液9におけるドーパント濃度を維持したい場合、Ar流量を50L/min~200L/min、炉内圧を20kPa~80kPaとする。
当該部分をワイヤーソー等でシリコンウェーハに切り出し、切り出されたシリコンウェーハにラッピング工程、研磨工程を施すことにより、抵抗率0.5mΩcm以上、0.6mΩcm未満のシリコンウェーハを得ることができる。
さらに、シリコンウェーハの加工後、アニール熱処理を行った後、シリコンウェーハの表面に、エピタキシャル成長膜を形成して、エピタキシャルシリコンウェーハを製造し、顧客に出荷する。
当該部分をワイヤーソー等でシリコンウェーハに切り出し、切り出されたシリコンウェーハにラッピング工程、研磨工程を施した後、顧客に出荷する。顧客では、必要に応じてエピタキシャル成長膜を形成し、半導体の製造を行う。
また、シリコン単結晶10の直胴部前半では、アルゴンガス流量を50L/min~150L/minとし、炉内圧を40kPa~80kPaとした。シリコン単結晶10の直胴部後半では、Ar流量を50L/min~200L/min、炉内圧を20kPa~80kPaとした。
シリコン単結晶10の直胴長の位置に応じて、赤リンドーパントの添加、Ar流量、炉内圧、液面からの熱遮蔽板12の高さ位置の変更、若しくはシリコン単結晶10の引き上げ速度の変更、およびこれらの組み合わせによって、抵抗率制御を行いながら、赤リンをドーピングしたシリコン単結晶10の引き上げを行った。結果を表1および図2に示す。なお、以下の説明において、直胴長0%位置とは、シリコン単結晶10の直胴部開始位置を意味し、直胴長100%位置とは、シリコン単結晶10のテール開始位置を意味する。
比較例2のシリコン単結晶は、表1および図2からわかるように、直胴部開始位置から80mmから直胴長20%の位置までで、すべて有転位化が発生し、シリコン単結晶を製造することができなかった。
シリコン単結晶の直胴長の位置に応じて、ヒ素ドーパント添加による抵抗率制御を行いながら、ヒ素をドーピングしたシリコン単結晶の引き上げを行った。結果を表3および図4に示す。
比較例4のシリコン単結晶は、表3および図4からわかるように、直胴部開始位置から80mmから直胴長20%の位置までで、すべて有転位化が発生し、シリコン単結晶を製造することができなかった。
同様に、実施例4のシリコン単結晶は、直胴部開始位置から55%の位置で抵抗率を1.4mΩcm以下とすることができ、しかも直胴部開始位置から80mmの位置における有転位化発生率を38%に抑制することができ、1.4mΩcm以下の低抵抗率シリコン単結晶を製造できることが確認された。
Claims (8)
- 赤リンを主たるドーパントとして含むシリコン融液から、チョクラルスキー法によりシリコン単結晶を引き上げて成長させるn型シリコン単結晶の製造方法であって、
前記シリコン単結晶の直胴部開始位置における電気抵抗率を、0.80mΩcm以上、1.05mΩcm以下に制御し、
その後、前記シリコン単結晶を引き上げて成長させるにつれて、順次前記シリコン単結晶の電気抵抗率を下げていき、前記シリコン単結晶の一部の電気抵抗率を、0.5mΩcm以上、0.7mΩcm以下とすることを特徴とするn型シリコン単結晶の製造方法。 - 赤リンを主たるドーパントとして含み、シリコン単結晶の一部の電気抵抗率が0.5mΩcm以上、0.6mΩcm未満であることを特徴とするn型シリコン単結晶のインゴット。
- 請求項2に記載のn型シリコン単結晶のインゴットから切り出され、電気抵抗率が0.5mΩcm以上、0.6mΩcm未満であることを特徴とするシリコンウェーハ。
- 請求項3に記載のシリコンウェーハの表面に、エピタキシャル成長膜を有することを特徴とするエピタキシャルシリコンウェーハ。
- ヒ素を主たるドーパントとして含むシリコン融液から、チョクラルスキー法によりシリコン単結晶を引き上げて成長させるn型シリコン単結晶の製造方法であって、
前記シリコン単結晶の直胴部開始位置における電気抵抗率を、1.90mΩcm以上、2.30mΩcm以下に制御し、
その後、前記シリコン単結晶を引き上げて成長させるにつれて、順次前記シリコン単結晶の電気抵抗率を下げていき、前記シリコン単結晶の一部の電気抵抗率を、1.2mΩcm以上、1.4mΩcm以下とすることを特徴とするn型シリコン単結晶の製造方法。 - ヒ素を主たるドーパントとして含み、シリコン単結晶の一部の電気抵抗率が1.2mΩcm以上、1.4mΩcm以下であることを特徴とするn型シリコン単結晶のインゴット。
- 請求項6に記載のn型シリコン単結晶のインゴットから切り出され、電気抵抗率が1.2mΩcm以上、1.4mΩcm以下であることを特徴とするシリコンウェーハ。
- 請求項7に記載のシリコンウェーハの表面に、エピタキシャル成長膜を有することを特徴とするエピタキシャルシリコンウェーハ。
Priority Applications (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201880026821.9A CN110730832A (zh) | 2017-04-25 | 2018-03-29 | n型单晶硅的制造方法、n型单晶硅锭、硅晶片及外延硅晶片 |
| KR1020197032044A KR102315981B1 (ko) | 2017-04-25 | 2018-03-29 | n형 실리콘 단결정의 제조 방법, n형 실리콘 단결정의 잉곳, 실리콘 웨이퍼 및 에피택셜 실리콘 웨이퍼 |
| DE112018002171.8T DE112018002171B4 (de) | 2017-04-25 | 2018-03-29 | Verfahren zur Herstellung eines Silicium-Einkristalls vom n-Typ |
| CN202210123737.7A CN114438587A (zh) | 2017-04-25 | 2018-03-29 | n型单晶硅的制造方法、n型单晶硅锭、硅晶片及外延硅晶片 |
| US16/607,205 US11377755B2 (en) | 2017-04-25 | 2018-03-29 | N-type silicon single crystal production method, n-type silicon single crystal ingot, silicon wafer, and epitaxial silicon wafer |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2017086531A JP7080017B2 (ja) | 2017-04-25 | 2017-04-25 | n型シリコン単結晶のインゴット、シリコンウェーハ、およびエピタキシャルシリコンウェーハ |
| JP2017-086531 | 2017-04-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2018198663A1 true WO2018198663A1 (ja) | 2018-11-01 |
Family
ID=63918260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2018/013362 Ceased WO2018198663A1 (ja) | 2017-04-25 | 2018-03-29 | n型シリコン単結晶の製造方法、n型シリコン単結晶のインゴット、シリコンウェーハ、およびエピタキシャルシリコンウェーハ |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US11377755B2 (ja) |
| JP (1) | JP7080017B2 (ja) |
| KR (1) | KR102315981B1 (ja) |
| CN (2) | CN110730832A (ja) |
| DE (1) | DE112018002171B4 (ja) |
| TW (2) | TWI665341B (ja) |
| WO (1) | WO2018198663A1 (ja) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7559882B2 (ja) | 2020-06-29 | 2024-10-02 | 株式会社Sumco | 半導体ウェーハ |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7036116B2 (ja) | 2017-06-29 | 2022-03-15 | 株式会社Sumco | シリコン単結晶の製造方法 |
| JP6881560B1 (ja) | 2019-12-24 | 2021-06-02 | 株式会社Sumco | シリコン単結晶の製造方法、シリコン単結晶 |
| CN114250508A (zh) * | 2021-12-02 | 2022-03-29 | 山东有研艾斯半导体材料有限公司 | 一种快速控制直拉单晶硅直径的方法 |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009515370A (ja) * | 2005-11-09 | 2009-04-09 | エムイーエムシー・エレクトロニック・マテリアルズ・インコーポレイテッド | ヒ素およびリンをド−プした、イントリンジックゲッタリングを有するシリコンウエハ基板 |
| WO2010021272A1 (ja) * | 2008-08-18 | 2010-02-25 | Sumco Techxiv株式会社 | シリコンインゴット、シリコンウェーハ及びエピタキシャルウェーハの製造方法、並びにシリコンインゴット |
| WO2013121696A1 (ja) * | 2012-02-14 | 2013-08-22 | 信越半導体株式会社 | シリコンエピタキシャルウェーハの製造方法 |
| JP2014513034A (ja) * | 2011-05-06 | 2014-05-29 | ジーティー アドヴァンスト シーズィー, エルエルシー | 最初のチャージだけをドーピングすることによる、均一にドーピングされたシリコンインゴットの成長 |
| JP2014132600A (ja) * | 2011-04-12 | 2014-07-17 | Renesas Electronics Corp | 半導体装置 |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002020192A (ja) | 2000-06-29 | 2002-01-23 | Shin Etsu Handotai Co Ltd | Gaドープシリコン単結晶の製造方法 |
| NO322246B1 (no) * | 2004-12-27 | 2006-09-04 | Elkem Solar As | Fremgangsmate for fremstilling av rettet storknede silisiumingots |
| JP5118386B2 (ja) | 2007-05-10 | 2013-01-16 | Sumco Techxiv株式会社 | 単結晶の製造方法 |
| JP5453749B2 (ja) * | 2008-09-05 | 2014-03-26 | 株式会社Sumco | 垂直シリコンデバイス用シリコンウェーハの製造方法及び垂直シリコンデバイス用シリコン単結晶引き上げ装置 |
| JP5373423B2 (ja) * | 2009-02-12 | 2013-12-18 | Sumco Techxiv株式会社 | シリコン単結晶及びその製造方法 |
| JP5589867B2 (ja) * | 2011-01-26 | 2014-09-17 | 信越半導体株式会社 | シリコンエピタキシャルウェーハの製造方法 |
| JP6471492B2 (ja) | 2014-12-24 | 2019-02-20 | 株式会社Sumco | 単結晶の製造方法 |
| JP6477210B2 (ja) | 2015-04-30 | 2019-03-06 | 株式会社Sumco | エピタキシャルシリコンウェーハの製造方法 |
| FR3045831B1 (fr) * | 2015-12-21 | 2018-01-26 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | Procede d'etalonnage d'un four de recuit utilise pour former des donneurs thermiques |
| JP6631460B2 (ja) * | 2016-10-03 | 2020-01-15 | 株式会社Sumco | シリコン単結晶の製造方法およびシリコン単結晶 |
| JP6631496B2 (ja) | 2016-12-22 | 2020-01-15 | 株式会社Sumco | シリコン単結晶の製造方法、熱遮蔽体および単結晶引き上げ装置 |
-
2017
- 2017-04-25 JP JP2017086531A patent/JP7080017B2/ja active Active
-
2018
- 2018-03-01 TW TW107106793A patent/TWI665341B/zh active
- 2018-03-01 TW TW108119710A patent/TWI691624B/zh active
- 2018-03-29 KR KR1020197032044A patent/KR102315981B1/ko active Active
- 2018-03-29 CN CN201880026821.9A patent/CN110730832A/zh active Pending
- 2018-03-29 WO PCT/JP2018/013362 patent/WO2018198663A1/ja not_active Ceased
- 2018-03-29 CN CN202210123737.7A patent/CN114438587A/zh active Pending
- 2018-03-29 US US16/607,205 patent/US11377755B2/en active Active
- 2018-03-29 DE DE112018002171.8T patent/DE112018002171B4/de active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009515370A (ja) * | 2005-11-09 | 2009-04-09 | エムイーエムシー・エレクトロニック・マテリアルズ・インコーポレイテッド | ヒ素およびリンをド−プした、イントリンジックゲッタリングを有するシリコンウエハ基板 |
| WO2010021272A1 (ja) * | 2008-08-18 | 2010-02-25 | Sumco Techxiv株式会社 | シリコンインゴット、シリコンウェーハ及びエピタキシャルウェーハの製造方法、並びにシリコンインゴット |
| JP2014132600A (ja) * | 2011-04-12 | 2014-07-17 | Renesas Electronics Corp | 半導体装置 |
| JP2014513034A (ja) * | 2011-05-06 | 2014-05-29 | ジーティー アドヴァンスト シーズィー, エルエルシー | 最初のチャージだけをドーピングすることによる、均一にドーピングされたシリコンインゴットの成長 |
| WO2013121696A1 (ja) * | 2012-02-14 | 2013-08-22 | 信越半導体株式会社 | シリコンエピタキシャルウェーハの製造方法 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP7559882B2 (ja) | 2020-06-29 | 2024-10-02 | 株式会社Sumco | 半導体ウェーハ |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201934817A (zh) | 2019-09-01 |
| US20200224329A1 (en) | 2020-07-16 |
| TW201907057A (zh) | 2019-02-16 |
| TWI691624B (zh) | 2020-04-21 |
| JP7080017B2 (ja) | 2022-06-03 |
| DE112018002171T5 (de) | 2020-02-13 |
| KR20190133041A (ko) | 2019-11-29 |
| CN110730832A (zh) | 2020-01-24 |
| TWI665341B (zh) | 2019-07-11 |
| KR102315981B1 (ko) | 2021-10-21 |
| CN114438587A (zh) | 2022-05-06 |
| JP2018184317A (ja) | 2018-11-22 |
| DE112018002171B4 (de) | 2025-06-05 |
| US11377755B2 (en) | 2022-07-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6881571B2 (ja) | n型シリコン単結晶の製造方法 | |
| US12116691B2 (en) | Method for producing silicon single crystal | |
| TWI592525B (zh) | 矽磊晶晶圓及矽磊晶晶圓的製造方法 | |
| WO2018198663A1 (ja) | n型シリコン単結晶の製造方法、n型シリコン単結晶のインゴット、シリコンウェーハ、およびエピタキシャルシリコンウェーハ | |
| JP2017222551A (ja) | シリコン単結晶の製造方法 | |
| JP7272343B2 (ja) | n型シリコン単結晶の製造方法 | |
| KR102265466B1 (ko) | 실리콘 단결정 제조 방법 | |
| WO2018216364A1 (ja) | シリコン単結晶の製造方法 |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 18789886 Country of ref document: EP Kind code of ref document: A1 |
|
| ENP | Entry into the national phase |
Ref document number: 20197032044 Country of ref document: KR Kind code of ref document: A |
|
| 122 | Ep: pct application non-entry in european phase |
Ref document number: 18789886 Country of ref document: EP Kind code of ref document: A1 |
|
| WWG | Wipo information: grant in national office |
Ref document number: 112018002171 Country of ref document: DE |