WO2016140185A1 - 導電性銅ペースト、導電性銅ペースト硬化膜および半導体装置 - Google Patents
導電性銅ペースト、導電性銅ペースト硬化膜および半導体装置 Download PDFInfo
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- WO2016140185A1 WO2016140185A1 PCT/JP2016/056042 JP2016056042W WO2016140185A1 WO 2016140185 A1 WO2016140185 A1 WO 2016140185A1 JP 2016056042 W JP2016056042 W JP 2016056042W WO 2016140185 A1 WO2016140185 A1 WO 2016140185A1
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- copper paste
- conductive copper
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- mass
- parts
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/103—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing an organic binding agent comprising a mixture of, or obtained by reaction of, two or more components other than a solvent or a lubricating agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K3/00—Apparatus or processes for manufacturing printed circuits
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Definitions
- the present invention relates to a conductive copper paste, a conductive copper paste cured film, and a semiconductor device, and in particular, a conductive copper paste that can be fired in an atmosphere, a cured film of the conductive copper paste, and a cured conductive copper paste film
- the present invention relates to a semiconductor device having
- the conventional conductive adhesive uses silver as a conductive filler.
- the use of copper as a conductive filler has been studied due to silver migration and price increase.
- the conductive adhesive using copper is also required to cure easily oxidizable copper in an air atmosphere.
- a paste using copper as a conductive filler a copper powder having a predetermined particle size distribution and tap density, a thermosetting resin, an organic carboxylic acid, a chelating agent, and a conductive copper paste containing polybutadiene as essential components are disclosed.
- Patent Document 1 Claim 1, paragraphs 0013 and 0022).
- This conductive copper paste can be screen-printed, has good conductivity comparable to that of conductive silver paste, and is suitable for use as a fine pitch-compatible through hole with migration resistance.
- organic carboxylic acids include salicylic acid, benzoic acid, tartaric acid, citric acid, maleic acid, succinic acid, fumaric acid, malonic acid and the like (see paragraph 0008 of Patent Document 1). (Paragraph 0018 of Patent Document 1). These organic carboxylic acids are solid at room temperature.
- a circuit comprising a metal powder containing copper, a compound containing at least two (meth) acrylic groups, and a ⁇ -dicarbonyl compound, and substantially free of an azo compound and a peroxide.
- a conductive paste for a substrate is disclosed (claim 1 of Patent Document 2). It is described that the conductive paste for circuit boards may contain a compound having flux activity (paragraph 0014 of Patent Document 2), and an aliphatic carboxylic acid such as oleic acid is used as the compound having flux activity. (Paragraphs 0038 and 0046 of Patent Document 2).
- a conductive copper paste composition is disclosed (Claim 1 of Patent Document 3), and examples of the reducing agent include unsaturated monocarboxylic acids having 12 to 23 carbon atoms such as oleic acid and linoleic acid (patents). Paragraph 0016 of Document 3).
- the inventors of the present invention can cure in the atmosphere by using copper powder, a fatty acid that is liquid at room temperature, and triethanolamine.
- a conductive copper paste that has a low specific resistance even under the conditions and does not significantly change the specific resistance of the conductive copper paste after curing depending on the copper powder content. That is, the present invention provides a conductive copper paste that can be cured in an air atmosphere, has a long pot life, has a low specific resistance after curing, and does not significantly change the specific resistance after curing due to the content of copper powder. For the purpose.
- the present invention relates to a conductive copper paste, a conductive copper paste cured film, a method for manufacturing a conductive copper paste cured film, and a semiconductor device that have solved the above problems by having the following configuration.
- a conductive copper paste comprising (A) copper powder, (B) a thermosetting resin, (C) a fatty acid which is liquid at normal temperature, and (D) triethanolamine.
- a conductive copper paste (having a specific resistance value of less than 1 ⁇ 10 ⁇ 4 ⁇ ⁇ cm) can be provided.
- a conductive copper paste cured film for obtaining a highly reliable semiconductor device can be provided.
- a cured conductive copper paste film for obtaining a highly reliable semiconductor device can be easily obtained by heating in an air atmosphere.
- a highly reliable semiconductor device having a small connection resistance value between the electrode portion of the semiconductor element and the conductive portion of the substrate can be obtained.
- the conductive copper paste of the present invention contains (A) copper powder, (B) a thermosetting resin, (C) a fatty acid that is liquid at normal temperature, and (D) triethanolamine.
- the copper powder as (A) imparts conductivity to the cured conductive copper paste.
- (A) As a component, rod shape, flake shape, and spherical copper powder are mentioned, From a viewpoint of the specific resistance of the electroconductive copper paste after hardening, rod shape and flake shape are preferable.
- the component (A) is more preferably a rod-shaped copper powder obtained by crushing a dendritic copper powder (electrolytic copper powder) in a particle shape, and a rod-shaped copper powder that has been surface-treated with a fatty acid, particularly oleic acid. Is more preferable.
- the electrolytic copper powder (ECY) made by Mitsui Mining & Smelting Co., Ltd.
- the electrolytic copper powder (10% particle size: 3. which surface-treated with fatty acid, especially oleic acid). 4 ⁇ m, 50% particle size: 8.1 ⁇ m, 90% particle size: 15.2 ⁇ m, tap density: 4.4 g / cm 3 ) are more preferable.
- the particle diameter is measured by a laser diffraction / scattering particle distribution measuring device, and the tap density is measured by a shaking specific gravity measuring device (tap machine).
- a component may be individual or may use 2 or more types together.
- thermosetting resin as component (B) imparts adhesiveness and curability to the conductive copper paste.
- a phenol resin is preferable from a viewpoint of thermosetting shrinkage and adhesiveness, and a resol type phenol resin is more preferable.
- a commercial product of the component (B) there is a resol type phenol resin (product name: CKM-918A) manufactured by Showa Denko KK.
- a component may be individual or may use 2 or more types together.
- a solid resin such as a resol-type phenol resin may be used after preparing a paste by heating and mixing with a solvent which is a component (E) described later.
- the component (C) functions as a flux component that elutes the oxidized layer on the surface of the copper powder.
- normal temperature refers to 25 ° C. Since the component (C) is in a liquid state, the uniformity in the conductive copper paste is improved, and the wettability to the surface of the copper powder as the component (A) is also improved.
- Oleic acid (CH 3 (CH 2 ) 7 CH ⁇ CH (CH 2 ) 7 COOH, cis-9-octadecenoic acid), Linoleic acid (CH 3 — (CH 2 ) 4 —CH ⁇ CHCH 2 CH ⁇ CH (CH 2 ) 7 COOH, cis-9, cis-12-octadecadienoic acid), Linolenic acid (CH 3 CH 2 CH ⁇ CHCH 2 CH ⁇ CHCH 2 CH ⁇ CH (CH 2 ) 7 COOH, cis-9, cis-12, cis-15-octadecatrienoic acid) And oleic acid is more preferable.
- a component may be individual or may use 2 or more types together.
- Component (D) triethanolamine (TEA, N (CH 2 CH 2 OH) 3 ), immobilizes copper ions eluted by the flux effect of component (C), and fatty acids at room temperature (25 ° C.) Suppresses the action of the carboxyl group.
- TEA triethanolamine
- N CH 2 CH 2 OH
- the component (A) is 80 to 90 with respect to a total of 100 parts by mass of the component (A) and the component (B). It is preferable that it is a mass part, and 87.5 mass parts is especially preferable.
- the component (A) is preferably 80 to 90 parts by mass with respect to a total of 100 parts by mass of the component (A) and the component (B), even in the case of a cured product of conductive copper paste, Part by mass is particularly preferred.
- the conductive copper paste has a small mass loss of less than 1% when cured, the content of the preferred component (A) in the cured product is the same as the content of the component (A) before curing. is there.
- the quantitative analysis of the component (A) is performed by a thermogravimetric analyzer.
- the component (B) is 10 to 20 parts per 100 parts by mass in total of the components (A) and (B). It is preferable that it is a mass part, and 12.5 mass parts is especially preferable.
- the component (B) is preferably 10 to 20 parts by mass with respect to a total of 100 parts by mass of the component (A) and the component (B), even in the case of a cured product of conductive copper paste. Part by mass is particularly preferred.
- the quantitative analysis of the component (B) is performed with an ion chromatograph-mass spectrometer.
- the component (C) is preferably 0.8 to 3 parts by mass and more preferably 1 part by mass with respect to a total of 100 parts by mass of the components (A) and (B).
- the component (C) is less than 0.8 part by mass, the specific resistance value of the copper paste cured film tends to be high, and when it is more than 3 parts by mass, the pot life of the copper paste tends to be short.
- the component (C) is preferably 0.8 to 3 parts by mass with respect to 100 parts by mass in total of the components (A) and (B).
- the quantitative analysis of the component (C) is performed by an ion chromatograph-mass spectrometer.
- the component (D) is preferably 1 to 5 parts by mass and more preferably 3 parts by mass with respect to 100 parts by mass in total of the components (A) and (B).
- the component (D) is less than 1 part by mass, the pot life of the copper paste tends to be short, and when it exceeds 5 parts by mass, the specific resistance value of the copper paste cured film tends to be high.
- the conductive copper paste can further use a solvent as the component (E) from the viewpoint of melting and liquefaction when the component (B) is solid and adjusting the viscosity of the conductive copper paste.
- the component (E) can be appropriately selected in consideration of the solubility and curing conditions of the thermosetting resin. Specifically, ethyl carbitol, ethyl carbitol acetate, butyl carbitol, butyl carbitol acetate, terpineol , Dihydroterpineol, ethyl cellosolve, butyl cellosolve, ethyl cellosolve acetate, butyl cellosolve acetate and the like.
- the component (B) is a phenol resin, it is preferable to use butyl carbitol.
- the component (E) is preferably 10 to 20 parts by mass with respect to 100 parts by mass of the conductive copper paste.
- a leveling agent, a colorant, an ion trapping agent, an antifoaming agent, a flame retardant, other additives, and the like are further blended as necessary without departing from the object of the present invention. be able to.
- the conductive copper paste of the present invention is obtained, for example, by stirring, melting, mixing, and dispersing the components (A) to (D) and other additives simultaneously or separately, with heat treatment as necessary.
- the mixing, stirring, dispersing and the like devices are not particularly limited, and a raikai machine equipped with a stirring and heating device, a three-roll mill, a ball mill, a planetary mixer, a bead mill and the like can be used. . Moreover, you may use combining these apparatuses suitably.
- the initial viscosity of the conductive copper paste is preferably in the range of 8 to 12 Pa ⁇ s from the viewpoint of screen printability.
- the initial viscosity of the conductive copper paste is measured at 25 ° C. and 50 rotations using a Brookfield type (B type) viscometer within 1 hour after the conductive copper paste is prepared.
- the time until the viscosity becomes 1.2 times or more of the initial viscosity is preferably 6 days or more.
- the conductive copper paste of the present invention is formed and applied to a desired position of an electronic component such as a conductive part of a substrate or an electrode part of a semiconductor element by screen printing, a dispenser or the like.
- the curing condition of the conductive copper paste of the present invention is preferably 150 to 300 ° C. and 5 to 30 minutes in the air atmosphere, and particularly suitable is a high temperature and short time at 200 to 220 ° C. for 5 to 15 minutes.
- a conductive copper paste cured film, which is a cured product of the conductive copper paste, has a low specific resistance.
- the method for producing a cured conductive copper paste film according to the present invention is characterized in that the conductive copper paste is screen-printed on a substrate and then heated at 200 to 220 ° C. for 5 to 15 minutes in an air atmosphere. To do.
- the conductive copper paste of the present invention is suitable as an adhesive for electronic parts such as an electrode part of a semiconductor element and a conductive part of a substrate.
- the semiconductor device of the present invention has a conductive copper paste cured film.
- the semiconductor device includes, for example, a conductive copper paste cured film that is a cured product of the conductive copper paste, including a substrate having a conductive portion and a semiconductor element having an electrode portion, and the conductive portion of the substrate and the electrode of the semiconductor element. The part is joined.
- the semiconductor device of the present invention has a small connection resistance value between the electrode portion of the semiconductor element and the conductive portion of the substrate, and is highly reliable.
- component (A) an oleic acid surface-treated electrolytic copper powder manufactured by Mitsui Mining & Smelting Co., Ltd. (10% particle size: 3.4 ⁇ m, 50% particle size: 8.1 ⁇ m, 90% particle size: 15.2 ⁇ m, tap density) : 4.4 g / cm 3 )
- component (B) a resol type phenolic resin (product name: CKM-918A) manufactured by Showa Denko KK
- component (C) oleic acid, linoleic acid, and linolenic acid manufactured by Wako Pure Chemical Industries, Ltd.
- component (C) palmitic acid (CH 3 (CH 2 ) 14 COOH (hexadecanoic acid), stearic acid (CH 3 (CH 2 ) 16 COOH) manufactured by Wako Pure Chemical Industries, Ltd.
- component (D) triethanolamine (TEA: product name: 2,2 ′, 2 ′′ -nitrilotriethanol) manufactured by Wako Pure Chemical Industries, Ltd.
- imidazole (2-phenyl-4,5-dihydroxymethylimidazole, product name: 2PHZ-PW) manufactured by Shikoku Kasei Kogyo Co., Ltd., monoethanolamine manufactured by Wako Pure Chemical Industries, Ltd.
- a conductive copper paste is printed on a screen printer with a pattern having a width of 1 mm and a length of 71 mm, and is heat-treated at 210 ° C. for 10 minutes in an air atmosphere with a blast constant temperature dryer. Cured.
- the film thickness of the obtained conductive copper paste cured film was measured using a surface roughness shape measuring machine (model number: Surfcom 1500SD-2) manufactured by Tokyo Seimitsu Co., Ltd., and the resistance value was digital manufactured by TFF Keithley Instruments Inc. Each was measured using a multimeter (model number: 2001), and the volume resistivity was calculated as a specific resistance value.
- Example 1 (A) Oleic acid surface-treated electrolytic copper powder as component: 87.5 parts by mass, 12.5 parts of resol type phenol resin as component (B) are heated and dissolved in 10.2 parts of butyl carbitol as component (E) In addition, oleic acid: 1 part as component (C) and triethanolamine: 3 parts as component (D) were uniformly kneaded by a three-roll mill to prepare a conductive copper paste. The pot life of this conductive copper paste was 8 days. The specific resistance value of the conductive copper paste cured film was 5.6 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- Oleic acid surface-treated electrolytic copper powder Conductive copper in the same manner as in Example 1 except that 85 parts by mass and 15 parts of a resol-type phenol resin were dissolved by heating in 12.3 parts of butyl carbitol. A paste was prepared. The specific resistance value of this conductive copper paste cured film was 9.6 ⁇ 10 ⁇ 5 ⁇ ⁇ cm. Note that the pot life was not measured.
- Example 3 Oleic acid surface-treated electrolytic copper powder Conductive copper in the same manner as in Example 1 except that 90 parts by mass and 10 parts of a resol type phenolic resin were dissolved by heating in 8.2 parts of butyl carbitol. A paste was prepared. The specific resistance value of this conductive copper paste cured film was 6.4 ⁇ 10 ⁇ 5 ⁇ ⁇ cm. Note that the pot life was not measured.
- Example 4 A conductive copper paste was prepared in the same manner as in Example 1 except that 3 parts of oleic acid was used as the component (C). The pot life of this conductive copper paste was 7 days. The specific resistance value of the conductive copper paste cured film was 5.9 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- Example 5 As the component (D), a conductive copper paste was prepared in the same manner as in Example 1 except that 1 part of triethanolamine was used. The pot life of this conductive copper paste was 6 days. Further, the specific resistance value of the cured conductive copper paste was 8.6 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- Example 6 A conductive copper paste was prepared in the same manner as in Example 1 except that 1 part of linoleic acid was used as the component (C). The pot life of this conductive copper paste was 7 days. The specific resistance value of the conductive copper paste cured film was 6.0 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- Example 7 A conductive copper paste was prepared in the same manner as in Example 1 except that 1 part of linolenic acid was used as the component (C). The pot life of this conductive copper paste was 8 days. The specific resistance value of the conductive copper paste cured film was 5.9 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- Example 1 A conductive copper paste was prepared in the same manner as in Example 1 except that oleic acid and triethanolamine were not added. The pot life of this conductive copper paste was 8 days. The specific resistance value of the conductive copper paste cured film was 7.1 ⁇ 10 ⁇ 4 ⁇ ⁇ cm.
- Example 2 A conductive copper paste was prepared in the same manner as in Example 1 except that triethanolamine was not added. The pot life of this conductive copper paste was less than 1 day. The specific resistance value of the cured copper paste film was 2.9 ⁇ 10 ⁇ 4 ⁇ ⁇ cm.
- Example 3 A conductive copper paste was prepared in the same manner as in Example 1 except that oleic acid was not added. The pot life of this conductive copper paste was 12 days. The specific resistance value of the copper paste cured film was 4.7 ⁇ 10 ⁇ 4 ⁇ ⁇ cm.
- a conductive copper paste was prepared in the same manner as in Example 1 except that imidazole (2-phenyl-4,5-dihydroxymethylimidazole, product name: 2PHZ-PW) was used instead of the component (D). .
- the pot life of this conductive copper paste was less than 1 day.
- the specific resistance value of the cured copper paste film was 1.8 ⁇ 10 ⁇ 4 ⁇ ⁇ cm.
- a conductive copper paste was prepared in the same manner as in Example 1 except that 1 part of palmitic acid, which is a solid fatty acid at room temperature, was used instead of the component (C).
- the pot life of this conductive copper paste was 4 days.
- the specific resistance value of the cured conductive copper paste film was 7.5 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- a conductive copper paste was prepared in the same manner as in Example 1 except that 1 part of stearic acid, which is a solid fatty acid at room temperature, was used instead of the component (C).
- the pot life of this conductive copper paste was 2 days.
- the specific resistance value of the conductive copper paste cured film was 6.7 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- Example 7 A conductive copper paste was prepared in the same manner as in Example 1 except that 3 parts of monoethanolamine (MEA) was used instead of the component (D). The pot life of this conductive copper paste was less than 1 day. Further, the specific resistance value of the conductive copper paste cured film was 1.4 ⁇ 10 ⁇ 4 ⁇ ⁇ cm.
- Example 8 A conductive copper paste was prepared in the same manner as in Example 1 except that 3 parts of diethanolamine (DEA) was used instead of the component (D). The pot life of this conductive copper paste was 1 day. The specific resistance value of the conductive copper paste cured film was 9.2 ⁇ 10 ⁇ 5 ⁇ ⁇ cm.
- DEA diethanolamine
- Example 8 to 10 Comparative Examples 9 to 11
- a comparative test between the present invention and the invention described in Patent Document 1 was performed.
- a conductive copper paste was prepared in the same manner as in Example 1 except that the composition shown in Table 2 was used.
- the specific resistance value of the prepared conductive copper paste cured film was measured. Table 2 shows the results.
- Example 11 to 14 A conductive copper paste was prepared and evaluated in the same manner as in Example 1 except that the composition shown in Table 3 was used.
- component (A) -2 of Example 14 a liquid phase reduced spherical copper powder (produced by the method described in JP-A-9-165606, average particle size: 6 ⁇ m) was used.
- Table 3 shows the results of specific resistance and pot life.
- Comparative Example 5 using palmitic acid instead of component (C) had a short pot life.
- Comparative Example 6 in which stearic acid was used instead of the component (C) the pot life was short.
- Comparative Example 7 using MEA instead of the component (D) had a high specific resistance value and a short pot life.
- Comparative Example 8 using DEA instead of the component (D) the pot life was short.
- the total resistance of the component (A) and the component (B) is 100 parts by weight, and the specific resistance value is 85 to 90 parts of the component (A). It was less than 1 ⁇ 10 ⁇ 4 ⁇ ⁇ cm.
- the specific resistance changes greatly depending on the content of the component (A), and even in Comparative Example 10 where the specific resistance is the smallest, the specific resistance is 2.438 ⁇ 10 ⁇ 4 ⁇ . -It was cm.
- the conductive copper paste of the present invention can be cured in the atmosphere, has a long pot life, has a low specific resistance value even under high temperature and short time curing conditions, and has a ratio after curing due to the content of copper powder. Since resistance does not change greatly, it is very useful.
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Abstract
Description
〔1〕(A)銅粉、(B)熱硬化性樹脂、(C)常温で液状の脂肪酸、および(D)トリエタノールアミンを含有することを特徴とする、導電性銅ペースト。
〔2〕(C)成分が、オレイン酸、リノール酸、およびリノレン酸から選ばれる少なくとも1種である、上記〔1〕記載の導電性銅ペースト。
〔3〕(B)成分が、レゾール型フェノール樹脂である、上記〔1〕または〔2〕記載の導電性銅ペースト。
〔4〕(B)成分が、(A)成分と(B)成分の合計100質量部に対して、10~20質量部である、上記〔1〕~〔3〕のいずれか記載の導電性銅ペースト。
〔5〕(C)成分が、(A)成分と(B)成分の合計100質量部に対して、0.8~3質量部である、上記〔1〕~〔4〕のいずれか記載の導電性銅ペースト。
〔6〕(D)成分が、(A)成分と(B)成分の合計100質量部に対して、1~5質量部である、上記〔1〕~〔5〕のいずれか記載の導電性銅ペースト。
〔7〕初期粘度が、8~12Pa・sである、上記〔1〕~〔6〕のいずれか記載の導電性銅ペースト。
〔8〕25℃で保持した時、初期粘度の1.2倍以上の粘度になるまでの時間が、1週間以上である、上記〔1〕~〔7〕いずれか記載の導電性銅ペースト。
〔9〕上記〔1〕~〔8〕のいずれか記載の導電性銅ペーストの硬化物である、導電性銅ペースト硬化膜。
〔10〕上記〔1〕~〔8〕のいずれか記載の導電性銅ペーストを、基板にスクリーン印刷した後、大気雰囲気下、200~220℃で、5~15分間加熱することを特徴とする、導電性銅ペースト硬化膜の製造方法。
〔11〕上記〔9〕記載の導電性銅ペースト硬化膜を有する、半導体装置。
本発明の導電性銅ペーストは、(A)銅粉、(B)熱硬化性樹脂、(C)常温で液状の脂肪酸、および(D)トリエタノールアミンを含有することを特徴とする。
オレイン酸(CH3(CH2)7CH=CH(CH2)7COOH、シス-9-オクタデセン酸)、
リノール酸(CH3-(CH2)4-CH=CHCH2CH=CH(CH2)7COOH、シス-9,シス-12-オクタデカジエン酸)、
リノレン酸(CH3CH2CH=CHCH2CH=CHCH2CH=CH(CH2)7COOH、シス-9,シス-12,シス-15-オクタデカトリエン酸)
が挙げられ、オレイン酸が、より好ましい。(C)成分は、単独でも2種以上を併用してもよい。
本発明の半導体装置は、導電性銅ペースト硬化膜を有する。半導体装置は、例えば、導電部を有する基板と、電極部を有する半導体素子とを含み、上記導電性銅ペーストの硬化物である導電性銅ペースト硬化膜で、基板の導電部と半導体素子の電極部とが接合される。
(A)成分として、三井金属鉱業(株)製オレイン酸表面処理電解銅粉(10%粒子径:3.4μm、50%粒子径:8.1μm、90%粒子径:15.2μm、タップ密度:4.4g/cm3)を、
(B)成分として、昭和電工(株)製のレゾール型フェノール樹脂(品名:CKM-918Aを、
(C)成分として、和光純薬工業(株)製のオレイン酸、リノール酸、リノレン酸を、
(C)成分の代替成分(室温で固体)として、和光純薬工業(株)製のパルミチン酸(CH3(CH2)14COOH(ヘキサデカン酸)、ステアリン酸(CH3(CH2)16COOH(オクタデカン酸)を、
(D)成分として、和光純薬工業(株)製トリエタノールアミン(TEA:品名:2,2’,2”-ニトリロトリエタノール)を、
(D)成分の代替成分として、四国化成工業(株)製のイミダゾール(2-フェニル-4,5-ジヒドロキシメチルイミダゾール、品名:2PHZ-PW)、和光純薬工業(株)製のモノエタノールアミン(MEA、NH2CH2CH2OH、品名:2-アミノエタノール)、ジエタノールアミン(DEA、NH(CH2CH2OH)2、品名:2,2’-イミノジエタノール)を、
(E)成分として、シェルケミカルズジャパン(株)製のブチルカルビトール(CH3(CH2)3O(CH2)2O(CH2)2OH、2-(2-ブトキシエトキシ)エタノールまたはジエチレングリコールモノブチルエーテル)を使用した。
《初期粘度測定》
導電性銅ペーストを作製した後、1時間以内に、ブルックフィールド型(B型)粘度計を用い、25℃、50回転で、導電性銅ペーストの初期粘度を測定した。
導電性銅ペーストを25℃で保持し、24時間毎に、ブルックフィールド型(B型)粘度計を用い、25℃、50回転で粘度を測定し、初期値の1.2倍(20%増加)以上になるまでの時間を測定した。
アルミナ基板上に、導電性銅ペーストを、スクリーン印刷機で、幅:1mm、長さ:71mmのパターンを印刷し、送風定温乾燥機で、大気雰囲気中、210℃×10分間加熱処理して、硬化させた。得られた導電性銅ペースト硬化膜の膜厚は、(株)東京精密製表面粗さ形状測定機(型番:サーフコム1500SD-2)を用いて、抵抗値は、(株)TFFケースレーインスツルメンツ製デジタルマルチメーター(型番:2001)を用いて、それぞれ測定し、体積抵抗率を算出し、比抵抗値とした。
(A)成分としてオレイン酸表面処理電解銅粉:87.5質量部、(B)成分としてのレゾール型フェノール樹脂12.5部を(E)成分としてブチルカルビトール10.2部に加熱溶解させたもの、(C)成分としてオレイン酸:1部、および(D)成分としてトリエタノールアミン:3部を、三本ロールミルで均一に混練し、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、8日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は、5.6×10-5Ω・cmであった。
オレイン酸表面処理電解銅粉:85質量部、レゾール型フェノール樹脂15部をブチルカルビトール12.3部に加熱溶解させたものを用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペースト硬化膜の比抵抗値は、9.6×10-5Ω・cmであった。なお、ポットライフの測定は、行わなかった。
オレイン酸表面処理電解銅粉:90質量部、レゾール型フェノール樹脂10部をブチルカルビトール8.2部に加熱溶解させたものを用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペースト硬化膜の比抵抗値は、6.4×10-5Ω・cmであった。なお、ポットライフの測定は、行わなかった。
(C)成分として、オレイン酸:3部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調整した。この導電性銅ペーストのポットライフは、7日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は、5.9×10-5Ω・cmであった。
(D)成分として、トリエタノールアミン:1部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調整した。この導電性銅ペーストのポットライフは、6日間であった。また、この導電性銅ペースト硬化物の比抵抗値は、8.6×10-5Ω・cmであった。
(C)成分として、リノール酸:1部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、7日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は6.0×10-5Ω・cmであった。
(C)成分として、リノレン酸:1部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、8日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は5.9×10-5Ω・cmであった。
オレイン酸、およびトリエタノールアミンを添加しなかったこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、8日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は、7.1×10-4Ω・cmであった。
トリエタノールアミンを添加しなかったこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、1日未満であった。また、この銅ペースト硬化膜の比抵抗値は、2.9×10-4Ω・cmであった。
オレイン酸を添加しなかったこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、12日間であった。また、この銅ペースト硬化膜の比抵抗値は、4.7×10-4Ω・cmであった。
(D)成分の代わりに、イミダゾール(2-フェニル-4,5-ジヒドロキシメチルイミダゾール、品名:2PHZ-PW)を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、1日未満であった。また、この銅ペースト硬化膜の比抵抗値は、1.8×10-4Ω・cmであった。
(C)成分の代わりに、室温で固体状の脂肪酸であるパルミチン酸:1部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、4日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は、7.5×10-5Ω・cmであった。
(C)成分の代わりに、室温で固体状の脂肪酸であるステアリン酸:1部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、2日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は、6.7×10-5Ω・cmであった。
(D)成分の代わりに、モノエタノールアミン(MEA):3部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、1日未満であった。また、この導電性銅ペースト硬化膜の比抵抗値は、1.4×10-4Ω・cmであった。
(D)成分の代わりに、ジエタノールアミン(DEA)3部を用いたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。この導電性銅ペーストのポットライフは、1日間であった。また、この導電性銅ペースト硬化膜の比抵抗値は9.2×10-5Ω・cmであった。
本発明と、特許文献1に記載された発明との比較試験を行った。表2に示す組成にしたこと以外は、実施例1と同様にして、導電性銅ペーストを調製した。調製した導電性銅ペースト硬化膜の比抵抗値を、測定した。表2に結果を示す。
表3に示す組成にしたこと以外は、実施例1と同様にして、導電性銅ペーストを調製し、評価を行った。実施例14の(A)成分-2には、ナミックス製液相還元球状銅粉(特開平9-165606号公報に記載された方法で作製、平均粒径:6μm)を使用した。表3に、比抵抗とポットライフの結果を示す。
Claims (11)
- (A)銅粉、(B)熱硬化性樹脂、(C)常温で液状の脂肪酸、および(D)トリエタノールアミンを含有することを特徴とする、導電性銅ペースト。
- (C)成分が、オレイン酸、リノール酸、およびリノレン酸から選ばれる少なくとも1種である、請求項1記載の導電性銅ペースト。
- (B)成分が、レゾール型フェノール樹脂である、請求項1または2記載の導電性銅ペースト。
- (B)成分が、(A)成分と(B)成分の合計100質量部に対して、10~20質量部である、請求項1~3のいずれか1項記載の導電性銅ペースト。
- (C)成分が、(A)成分と(B)成分の合計100質量部に対して、0.8~3質量部である、請求項1~4のいずれか1項記載の導電性銅ペースト。
- (D)成分が、(A)成分と(B)成分の合計100質量部に対して、1~5質量部である、請求項1~5のいずれか1項記載の導電性銅ペースト。
- 初期粘度が、8~12Pa・sの範囲である、請求項1~6のいずれか1項記載の導電性銅ペースト。
- 25℃で保持した時、初期粘度の1.2倍以上の粘度になるまでの時間が、1週間以上である、請求項1~7のいずれか1項記載の導電性銅ペースト。
- 請求項1~8のいずれか1項記載の導電性銅ペーストの硬化物である、導電性銅ペースト硬化膜。
- 請求項1~8のいずれか1項記載の導電性銅ペーストを、基板にスクリーン印刷した後、大気雰囲気下、200~220℃で、5~15分間加熱することを特徴とする、導電性銅ペースト硬化膜の製造方法。
- 請求項9記載の導電性銅ペースト硬化膜を有する、半導体装置。
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| JP2017503467A JPWO2016140185A1 (ja) | 2015-03-05 | 2016-02-29 | 導電性銅ペースト、導電性銅ペースト硬化膜および半導体装置 |
| CN201680009284.8A CN107210085A (zh) | 2015-03-05 | 2016-02-29 | 导电性铜浆料、导电性铜浆料固化膜和半导体装置 |
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| JP2017141332A (ja) * | 2016-02-09 | 2017-08-17 | ナミックス株式会社 | 樹脂組成物、導電性銅ペースト、および半導体装置 |
| WO2019004331A1 (ja) | 2017-06-30 | 2019-01-03 | 積水化学工業株式会社 | 導電性ペースト |
| JP2019057694A (ja) * | 2017-09-22 | 2019-04-11 | 日亜化学工業株式会社 | 多層基板の製造方法、部品実装基板の製造方法、多層基板、および、部品実装基板 |
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| JPWO2016140185A1 (ja) | 2017-12-14 |
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