JP2015035459A - 金属ナノ粒子を用いた接合構造および金属ナノ粒子を用いた接合方法 - Google Patents
金属ナノ粒子を用いた接合構造および金属ナノ粒子を用いた接合方法 Download PDFInfo
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- JP2015035459A JP2015035459A JP2013164777A JP2013164777A JP2015035459A JP 2015035459 A JP2015035459 A JP 2015035459A JP 2013164777 A JP2013164777 A JP 2013164777A JP 2013164777 A JP2013164777 A JP 2013164777A JP 2015035459 A JP2015035459 A JP 2015035459A
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- metal
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Abstract
Description
本発明の実施の形態1について、図面を用いて以下に説明する。
図1は、本発明の実施の形態1に係る接合構造の断面図である。図1に示すように、接合構造は、第1部材1と、第2部材2と、接合材3とを備えている。第1部材1は、導電性金属で構成されている。第2部材2は、導電性金属で構成され、第1部材1と対向する位置に配置されている。接合材3は、金属ナノ粒子が焼結されて得られた集合体であり、第1部材1と第2部材2との間に介在されている。また、第2部材2の表面には、粗面である第1粗度領域25が形成されている。なお、第1粗度領域25の詳細については後述する。
次に、図4の信頼性試験の際に使用された接合構造および接合方法について説明する。図5は、図1の接合構造の製造途中を示す断面図である。
一般的に金属同士の接合では異種金属よりも同種金属の方が、接合が容易である。また、金属ナノ粒子の接合原理は粒子表面の接合エネルギーを利用するものであり、上記の理由から金属ナノ粒子の異種金属に対する絶対的な接触面積を増加させることで異種金属間界面に発生する剥離を防止できる。表面粗度を調整することで、その接触面積を増加させることが可能となる。以上から界面剥離率の低く、信頼性の高い接合が可能となる。また、この微細な金属ペーストを用いた接合手法を確立させ、高品質、高信頼性の接合構造を得ることができる。
次に、実施の形態2に係る接合構造について説明する。図6は、実施の形態2に係る接合構造の第2部材2の平面図である。なお、実施の形態2において、実施の形態1で説明したものと同一の構成要素については同一符号を付して説明は省略する。
次に、実施の形態3に係る接合構造について説明する。図7は、実施の形態3に係る接合構造の第2部材2の平面図である。なお、実施の形態3において、実施の形態1,2で説明したものと同一の構成要素については同一符号を付して説明は省略する。
次に、実施の形態4に係る接合構造について説明する。図8は、実施の形態4に係る接合構造の第2部材2の平面図である。なお、実施の形態4において、実施の形態1〜3で説明したものと同一の構成要素については同一符号を付して説明は省略する。
Claims (7)
- 少なくとも片面に金属面を有する第1部材と、
少なくとも片面に金属面を有し、かつ、当該金属面が、前記第1部材の金属面と対向する位置に配置された第2部材と、
金属ナノ粒子を焼結接合することで、前記第1部材と前記第2部材とを接合する接合材と、
を備え、
前記第1部材と前記第2部材の少なくとも一方の金属面は、0.5μm〜2.0μmの表面粗さを有する粗面に形成された、金属ナノ粒子を用いた接合構造。 - 前記粗面は、第1の表面粗さを有する第1粗度領域と、前記第1の表面粗さよりも粗い第2の表面粗さを有する第2粗度領域とを備え、
前記第1粗度領域と前記第2粗度領域は、それぞれ平行な直線の縞状に形成された、請求項1記載の金属ナノ粒子を用いた接合構造。 - 前記粗面は、第1の表面粗さを有する第1粗度領域と、前記第1の表面粗さよりも粗い第2の表面粗さを有する第2粗度領域とを備え、
前記第2粗度領域は、十字状または格子状に形成された、請求項1記載の金属ナノ粒子を用いた接合構造。 - 前記粗面は、前記第1部材と前記第2部材の少なくとも一方の金属面において、他方の金属面との接合領域よりも大きな領域に形成された、請求項1〜3のいずれか1つに記載の金属ナノ粒子を用いた接合構造。
- 前記第1部材は半導体素子であり、前記第2部材はヒートスプレッダである、請求項1〜4のいずれか1つに記載の金属ナノ粒子を用いた接合構造。
- 前記半導体素子はSiCである、請求項5記載の金属ナノ粒子を用いた接合構造。
- 少なくとも片面に金属面を有する第1部材と、少なくとも片面に金属面を有する第2部材とを接合する金属ナノ粒子を用いた接合方法であって、
(a)前記第1部材と前記第2部材の少なくとも一方の金属面に、0.5μm〜2.0μmの表面粗さを有する粗面を形成する工程と、
(b)前記第2部材の金属面に、金属ナノペーストを一定厚みで印刷する工程と、
(c)前記第2部材に印刷された金属ナノペースト上に、前記第1部材を載置する工程と、
(d)前記第2部材に印刷された金属ナノペースト上に、前記第1部材を載置した状態で加熱を行い、金属ナノペーストに含まれる金属ナノ粒子を焼結接合する工程と、
を備えた、金属ナノ粒子を用いた接合方法。
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