JP6209666B1 - 導電性接合材料及び半導体装置の製造方法 - Google Patents
導電性接合材料及び半導体装置の製造方法 Download PDFInfo
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- JP6209666B1 JP6209666B1 JP2016235326A JP2016235326A JP6209666B1 JP 6209666 B1 JP6209666 B1 JP 6209666B1 JP 2016235326 A JP2016235326 A JP 2016235326A JP 2016235326 A JP2016235326 A JP 2016235326A JP 6209666 B1 JP6209666 B1 JP 6209666B1
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- silver
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- bonding material
- conductive bonding
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- 238000004566 IR spectroscopy Methods 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Malonic acid Chemical compound OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
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- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 description 1
- 125000004185 ester group Chemical group 0.000 description 1
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- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
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- 239000011707 mineral Substances 0.000 description 1
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- 239000011146 organic particle Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
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- 229910052697 platinum Inorganic materials 0.000 description 1
- 150000003138 primary alcohols Chemical class 0.000 description 1
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- 150000003242 quaternary ammonium salts Chemical class 0.000 description 1
- 150000003333 secondary alcohols Chemical class 0.000 description 1
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- 238000004062 sedimentation Methods 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L24/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L24/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
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- 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
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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
- B22F1/12—Metallic powder containing non-metallic particles
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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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/12—Both compacting and sintering
- B22F3/14—Both compacting and sintering simultaneously
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B22F7/06—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 workpieces or articles from parts, e.g. to form tipped tools
- B22F7/08—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 workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- 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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- 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
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/50—Assembly of semiconductor devices using processes or apparatus not provided for in a single one of the subgroups H01L21/06 - H01L21/326, e.g. sealing of a cap to a base of a container
- H01L21/52—Mounting semiconductor bodies in containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L24/00—Arrangements for connecting or disconnecting semiconductor or solid-state bodies; Methods or apparatus related thereto
- H01L24/80—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected
- H01L24/83—Methods for connecting semiconductor or other solid state bodies using means for bonding being attached to, or being formed on, the surface to be connected using a layer connector
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F2301/00—Metallic composition of the powder or its coating
- B22F2301/25—Noble metals, i.e. Ag Au, Ir, Os, Pd, Pt, Rh, Ru
- B22F2301/255—Silver or gold
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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
- B22F7/06—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 workpieces or articles from parts, e.g. to form tipped tools
- B22F7/062—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 workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts
- B22F7/064—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 workpieces or articles from parts, e.g. to form tipped tools involving the connection or repairing of preformed parts using an intermediate powder layer
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/291—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/29138—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 950°C and less than 1550°C
- H01L2224/29139—Silver [Ag] as principal constituent
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
- H01L2224/28—Structure, shape, material or disposition of the layer connectors prior to the connecting process
- H01L2224/29—Structure, shape, material or disposition of the layer connectors prior to the connecting process of an individual layer connector
- H01L2224/29001—Core members of the layer connector
- H01L2224/29099—Material
- H01L2224/29198—Material with a principal constituent of the material being a combination of two or more materials in the form of a matrix with a filler, i.e. being a hybrid material, e.g. segmented structures, foams
- H01L2224/29298—Fillers
- H01L2224/29499—Shape or distribution of the fillers
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- H—ELECTRICITY
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Abstract
Description
また特許文献2に記載の導電性接合材料は無加圧で接合されることから接合後の層間がポーラス状で空隙率が高く、200℃以上での高温エイジングにおいて過焼結が起こり、接合層が過疎化するという現象が見られ、耐熱性が不十分であった。
該空隙率を低くするために非常に高い加圧力で接合層の空隙率を低下する方法があるものの、その場合の加圧力は30MPa以上と高く、素子にダメージを与えてしまうおそれがあった。
そこで本発明では、低加圧で空隙率の非常に低い接合層を形成することができ、高い接合強度及び熱伝導性を有する導電性接合材料を提供することを目的とする。
[1] 銀粒子、銀化合物粒子及び分散剤を含み、チップと被着体とを加圧下で接合するための導電性接合材料であって、
前記銀粒子と前記銀化合物粒子との重量比が30:70〜70:30であり、かつ
前記チップと前記被着体とを、大気下、10MPa280℃で5分間加圧接合した後の導電性接合材料の空隙率が15%以下である導電性接合材料。
[2] 前記空隙率が5%以下である前記[1]に記載の導電性接合材料。
[3] 前記銀粒子が平均粒径0.1〜30μm、タップ密度3g/cc以上の球状又はアスペクト比1.0〜100、平均粒径0.1〜10μmかつタップ密度3g/cc以上の鱗片状である前記[1]又は[2]に記載の導電性接合材料。
[4] 前記銀化合物粒子と前記分散剤との重量比が100:0.5〜100:50である前記[1]〜[3]のいずれか1に記載の導電性接合材料。
[5] さらに溶剤を含む前記[1]〜[4]のいずれか1に記載の導電性接合材料。
[6] 前記分散剤が、アルコール類、カルボン酸類及びアミン類からなる群より選ばれる少なくとも1種の化合物である前記[1]〜[5]のいずれか1に記載の導電性接合材料。
[7] チップと被着体とが導電性接合材料を介して接合される工程を含む半導体装置の製造方法であって、
前記導電性接合材料は、銀粒子、銀化合物粒子及び分散剤を含み、前記銀粒子と前記銀化合物粒子との重量比が30:70〜70:30であり、
前記接合される工程において、4〜30MPa、200〜350℃で1〜30分間加圧処理され、かつ
前記接合される工程後の導電性接合材料の空隙率が10%以下である、半導体装置の製造方法。
本発明に係る導電性接合材料は、銀粒子、銀化合物粒子及び分散剤を含み、チップと被着体とを加圧下で接合するための導電性接合材料であって、前記銀粒子と前記銀化合物粒子との重量比が30:70〜70:30であり、かつ前記チップと前記被着体とを、大気下、10MPa280℃で5分間加圧接合した後の導電性接合材料の空隙率が15%以下であることを特徴とする。
本発明における銀粒子は導電性と接合特性とを兼ね備えるものである。銀の融点は960℃程度であるのに対し、本発明では銀化合物粒子と分散剤を併用することにより、200〜300℃といった低温で焼結させ、被着体との界面において、金属結合で接合することが可能となる。
銀化合物粒子の分解により発生した酸化性物質が、銀粒子を覆っている分散剤の燃焼を促進する。また、銀化合物粒子の分解により発生した銀は微細で表面が無垢なため、銀粒子よりも焼結性がよく、加圧を同時に行うことで還元により発生する空間を低減させ、低加圧で空隙率の非常に低い接合層を形成できる。
銀粒子と銀化合物粒子との合計に対して銀化合物粒子の割合を30重量%以上とすることにより、銀への還元時に形成される空隙が加圧により同時に潰されていくことから、加圧接合時後の空隙率が低くなり、結果的に銀化合物粒子が少ない場合よりも接合強度及び熱伝導性に優れた接合面が形成される。
接合層中の空隙率が高いと、200℃以上での高温エイジングにおいて過焼結が起こり、接合層が過疎化するという現象が見られ、耐熱性が不十分となる。一方、非常に高い圧力により接合層の空隙率を低下させようとすると、半導体素子にダメージを与えてしまうおそれがある。
本発明における分散剤は滑材とも呼ばれ、銀粒子や銀化合物粒子同士の凝集を防ぐために銀粒子及び/または銀化合物粒子の表面を覆う化合物である。銀化合物粒子の分解により発生した酸化性物質により、分散剤の燃焼が促進される。
分散剤は、銀粒子及び/または銀化合物粒子の表面に先に被覆させても、銀粒子や銀化合物粒子を含む混合物に対して後から添加することで被覆させてもよい。
分散剤は従来一般に用いられるものであればよく、例えば、ステアリン酸、オレイン酸等が挙げられる。中でも、アルコール類、カルボン酸類及びアミン類からなる群より選ばれる少なくとも1種の化合物が分散性と易燃焼性の点から好ましい。分散剤は一種を用いても、複数種を組み合わせて用いてもよい。
本発明に係る導電性接合材料には、さらに導電性接合材料をペースト状にするために溶剤を含んでいてもよい。溶剤としては導電性接合材料がペースト状になるものであれば特に限定されないが、沸点350℃以下のものが、後述する半導体装置の製造において、チップと被着体とを接合する際に溶剤が揮発しやすいことから好ましく、沸点300℃以下がより好ましい。
具体的にはアセテート、エーテル、炭化水素等が挙げられ、より具体的には、ジブチルカルビトール、ブチルカルビトールアセテート、ミネラルスプリット等が好ましく用いられる。
本発明に係る導電性接合材料には、本発明の効果を損なわない範囲において、脂肪酸化合物や導電性粒子、無機充填剤、沈降抑制剤、レオロジーコントロール剤、ブリード抑制剤、消泡剤等を添加してもよい。
上記と同様の条件で加圧接合をした場合の接合強度は、25℃、200mm/sec.のテストスピードで測定を行った場合、好ましくは40MPa以上であり、より好ましくは50MPa以上である。
熱伝導率λ=熱拡散率a×比重d×比熱Cp
接合サンプルにレーザーパルス光を照射し、裏面側の温度変化を測定し、この温度変化挙動から熱拡散率aを求める。この熱拡散率aと、比重dおよび比熱Cpから、上記式により熱伝導率λ(W/m・K)を算出する。熱拡散率aは、レーザーフラッシュ法熱定数測定装置を用いて測定でき、例えば、ULVAC−RIKO社製のTC−7000を使用できる。比熱Cpは、示差走査熱量測定装置を用いて測定でき、例えば、セイコー電子工業社製のDSC7020を使用して、JIS−K7123に準拠して室温での比熱Cpを測定できる。
上記と同様の条件で加圧接合をした場合の熱伝導率は、好ましくは、250W/m・K以上であり、より好ましくは300W/m・K以上であり、さらに好ましくは350W/m・K以上である。
銀粒子、銀化合物粒子及び分散剤の混合を行うことで、本発明に係る導電性接合材料を得ることができる。分散剤は先に添加しても後から添加してもよく、それにより、該銀粒子及び銀化合物粒子の少なくともいずれか一方は分散剤で覆われている。
混合は乾式でも溶剤を用いる湿式でもよく、乳鉢や遊星ボールミル、ロールミル、プロペラレスミキサー等を用いることができる。
本発明に係る導電性接合材料は、チップと被着体とが接合された半導体装置の製造方法に好適に用いることができる。すなわち、該半導体装置の製造方法は、チップと被着体とが本発明に係る導電性接合材料を介して接合される工程を含む。
被着体としてはリードフレームやDBC基板、プリント基板等が挙げられる。
加圧接合は大気下、窒素雰囲気下、水素等の還元雰囲気下等、あらゆる雰囲気下で行うことができるが、生産性の点から大気下が好ましい。
接合される工程における温度は空隙率の点から200℃以上が好ましく、250℃以上がより好ましい。また温度の上限は周辺部材へのダメージの点から350℃以下が好ましく、300℃以下がより好ましい。
接合される工程における加圧・加熱の処理時間は空隙率の点から1分以上が好ましく、周辺部材へのダメージおよび生産性の点から30分以下が好ましい。
また、導電性接合材料中の銀粒子と銀化合物粒子との重量比が30:70〜70:30と、銀化合物粒子の割合が多いことで、先述した銀の焼結性の向上に加え、銀化合物粒子の分解に伴う体積収縮による影響も大きくなる。体積収縮により形成された空隙が4〜30MPaといった比較的低圧でも即座に潰されていき、空隙率10%以下という低い空隙率を達成することができる。
この低い空隙率により、接合後の導電性接合材料は金属バルクに近くなり、接合強度、熱伝導性が共に高く、放熱性に優れた半導体装置を得ることができる。
接合サンプルの接合層断面のSEM観察を行う。画像解析ソフトImage Jを用いて、得られたSEM写真上の接合層内の20μm×50μmの領域を2値化し空隙部位の面積比率から空隙率を算出した。
接合サンプルを、接合強度測定器〔Dage社製、「Series4000」(製品名)〕を用い、200mm/sec.のテストスピードで25℃でのダイシェア強度を測定した。
熱伝導率λ(W/m・K)は、レーザーフラッシュ法熱定数測定装置(TC−7000、ULVAC−RIKO社製)を用いてASTM−E1461に準拠して熱拡散率aを測定し、ピクノメーター法により室温での比重dを算出し、示差走査熱量測定装置(DSC7020、セイコー電子工業社製)を用いてJIS−K7123に準拠して室温での比熱Cpを測定して以下の式により算出した。結果を表1に示す。
熱伝導率λ=熱拡散率a×比重d×比熱Cp
銀粒子として、粒子形状が球状であり、平均粒径が1.0μmで、タップ密度が5g/ccの田中貴金属工業(株)製の銀粉末を用意した。
また、銀化合物粒子として、粒子形状が粒状であり、平均粒径が10μmの田中貴金属工業(株)製、製品名AY6059の酸化銀粉末を用意した。
導電性接合材料中の銀粒子の含有量に対する銀化合物粒子の含有量の比を表1に記載の比となるように、銀粒子と酸化銀粒子との混合比を調整し混合した。
得られた導電性接合材料を12×12mm2の銀メッキした銅リードフレームに塗布し、塗布面に3mm×3mmの銀スパッタリングシリコンチップを戴置後、大気下、10MPaで3mm×3mmの銀スパッタリングシリコンチップに垂直に加圧しながら、280℃で5分加熱し、半導体装置の銀接合体を作製した。
得られた銀接合体の空隙率、接合強度、及び熱伝導率を測定した結果を表1に示す。またSEM写真を図1に示す。
銀粒子を、粒子形状が鱗片状であり、アスペクト比が4であり、平均粒径が2.2μmで、タップ密度が6.2g/ccの田中貴金属工業(株)製の銀粉末としたことを除いては、実施例1と同様にして半導体装置の銀接合体を作製した。得られた銀接合体の空隙率、接合強度、及び熱伝導率を表1に示す。
銀粒子、銀化合物粒子及び分散剤の配合量を表1の実施例3に示す量に変更したことを除いては、実施例1と同様にして半導体装置の銀接合体を作製した。得られた銀接合体の空隙率、接合強度、及び熱伝導率を測定した結果を表1に示す。
銀粒子、銀化合物粒子及び分散剤の配合量を表1の実施例4に示す量に変更したことを除いては、実施例1と同様にして半導体装置の銀接合体を作製した。得られた銀接合体の空隙率、接合強度、及び熱伝導率を測定した結果を表1に示す。
銀粒子、銀化合物粒子及び分散剤の配合量を表1の比較例1に示す量に変更したことを除いては、実施例1と同様にして半導体装置の銀接合体を作製した。得られた銀接合体の空隙率、接合強度、及び熱伝導率を測定した結果を表1に示す。またSEM写真を図2に示す。
銀粒子、銀化合物粒子及び分散剤の配合量を表1の比較例2に示す量に変更したことを除いては、実施例1と同様にして半導体装置の銀接合体を作製した。得られた銀接合体の空隙率、接合強度、及び熱伝導率を測定した結果を表1に示す。
Claims (6)
- 銀粒子、銀化合物粒子及び分散剤を含み、チップと被着体とを加圧下で接合するための導電性接合材料であって、
前記銀化合物粒子が加熱により少なくとも銀と酸化性物質に分解される化合物粒子であり、
前記銀粒子と前記銀化合物粒子との重量比が30:70〜70:30であり、かつ
前記チップと前記被着体とを、大気下、10MPa280℃で5分間加圧接合した後の導電性接合材料の空隙率が15%以下である導電性接合材料。 - 前記空隙率が5%以下である請求項1に記載の導電性接合材料。
- 前記銀粒子が平均粒径0.1〜30μm、タップ密度3g/cc以上の球状又はアスペクト比1.0〜100、平均粒径0.1〜10μmかつタップ密度3g/cc以上の鱗片状である請求項1又は2に記載の導電性接合材料。
- 前記銀化合物粒子と前記分散剤との重量比が100:0.5〜100:50である請求項1〜3のいずれか1項に記載の導電性接合材料。
- さらに溶剤を含む請求項1〜4のいずれか1項に記載の導電性接合材料。
- 前記分散剤が、アルコール類、カルボン酸類及びアミン類からなる群より選ばれる少なくとも1種の化合物である請求項1〜5のいずれか1項に記載の導電性接合材料。
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