JP7412532B2 - 薄板状接合部材の製造方法、半導体装置の製造方法、ならびに、電力変換装置の製造方法 - Google Patents
薄板状接合部材の製造方法、半導体装置の製造方法、ならびに、電力変換装置の製造方法 Download PDFInfo
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- JP7412532B2 JP7412532B2 JP2022505093A JP2022505093A JP7412532B2 JP 7412532 B2 JP7412532 B2 JP 7412532B2 JP 2022505093 A JP2022505093 A JP 2022505093A JP 2022505093 A JP2022505093 A JP 2022505093A JP 7412532 B2 JP7412532 B2 JP 7412532B2
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- H01L23/36—Selection of materials, or shaping, to facilitate cooling or heating, e.g. heatsinks
- H01L23/373—Cooling facilitated by selection of materials for the device or materials for thermal expansion adaptation, e.g. carbon
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Description
前記第1金属の融点より低く前記第2金属の融点より高い温度で、前記ペーストを加熱することにより、前記基材の表面に薄板状接合部材を形成する工程と、
前記薄板状接合部材を前記基材から剥離することにより、前記薄板状接合部材を得る工程と、を含む、
薄板状接合部材の製造方法。
実施の形態1.
実施の形態1は、薄板状接合部材の製造方法に関する。
本実施の形態における薄板状接合部材の製造方法は、
第1金属(高融点金属)を含む第1粒子1と、第1金属よりも低い融点を有する第2金属(低融点金属)を含む第2粒子2と、溶剤と、を含むペーストを、第2金属と反応しない物質からなる基材の表面に塗布する工程(基材上へのペースト塗布)と、
第1金属の融点より低く第2金属の融点より高い温度で、ペーストを加熱することにより、基材の表面に薄板状接合部材を形成する工程(仮加熱処理)と、
薄板状接合部材を基材から剥離することにより、薄板状接合部材を得る工程(薄板状接合部材の剥離)と、を含む(図11参照)。
上記ペーストとしては、例えば、第1粒子1(第1金属を含む高融点金属粒子)として40質量%のCu粒子と、第2粒子2(第1金属よりも低い融点を有する第2金属を含む低融点金属粒子)として60質量%のSn粒子とを混合し、溶剤(例えば、ジエチレングリコール)を加えることにより調製されるペーストを用いることができる。
基材3に塗布されたペーストは、第1金属(例えば、Cu)の融点より低く第2金属(例えば、Sn)の融点より高い温度で熱処理(仮加熱処理)される。仮加熱処理の温度、時間等は、加熱処理後に得られる薄板状接合部材中に第1金属と未反応の第2金属が残留する範囲であれば、任意で調節してよい。
仮加熱処理後に、基材3上に形成された薄板状接合部材を基材3から剥離することで、薄板状接合部材を得ることができる(図3参照)。なお、基材3(ガラス板等)と薄板状接合部材は反応しないため、ヘラ等で容易に剥離することができる。
実施の形態2.
実施の形態2は、樹脂を含む薄板状接合部材の製造方法に関する。
図4を参照して、本実施の形態における薄板状接合部材の製造方法では、ペーストは、樹脂粒子5をさらに含む。それ以外の点は実施の形態1と同様であるため、重複する説明は省略する。
実施の形態3.
実施の形態3の薄板状接合部材の製造方法は、基材から剥離された薄板状接合部材を液体状の熱硬化性樹脂に浸漬する工程をさらに含む。
図7を参照して、本実施の形態では、実施の形態1または実施の形態2に示す方法で作製された薄板状接合部材が、液体状の(加熱硬化前の)熱硬化性樹脂に浸漬される。これにより、薄板状接合部材の金属粒子の隙間に液状の熱硬化性樹脂が充填される。その後、後述する導体部材と半導体素子とを接合するための加熱処理(本加熱処理)などにより、樹脂が硬化することで、図6と同様の構造を有する薄板状接合部材を得ることができる。
実施の形態4.
本実施の形態は、上記のいずれかの製造方法で製造される薄板状接合部材に関する。
実施の形態5.
実施の形態5は、上述の薄板状接合部材を用いた半導体装置、およびその製造方法に関する。
実施の形態6.
本実施の形態は、上述の実施の形態5の半導体装置の製造方法について、導体部材と半導体素子とのより高い接合信頼性を得るための製造方法に関する。
実施の形態7.
実施の形態7は、実施の形態5に係る半導体装置を適用した電力変換装置に関する。図13は、実施の形態7における電力変換装置を適用した電力変換システムの構成を示すブロック図である。
Claims (21)
- 第1金属を含む第1粒子と、前記第1金属よりも低い融点を有する第2金属を含む第2粒子と、溶剤と、を含むペーストを、前記第2金属と反応しない物質からなる基材の表面に塗布する工程と、
前記第1金属の融点より低く前記第2金属の融点より高い温度で、前記ペーストを加熱することにより、前記基材の表面に薄板状接合部材を形成する工程と、
前記薄板状接合部材を前記基材から剥離することにより、前記薄板状接合部材を得る工程と、を含む、
薄板状接合部材の製造方法。 - 前記第1金属は、Cu、AgおよびNiからなる群から選択される少なくとも1つの金属を含む、請求項1に記載の薄板状接合部材の製造方法。
- 前記第2金属は、Sn、Ag、Sb、Ni、P、Pt、Au、BiおよびInからなる群から選択される少なくとも1つの金属を含む、請求項1または2に記載の薄板状接合部材の製造方法。
- 前記第1粒子は、前記第2金属でめっきされている、請求項1~3のいずれか1項に記載の薄板状接合部材の製造方法。
- 前記ペーストは、フラックスをさらに含む、請求項1~4のいずれか1項に記載の製造方法。
- 前記ペーストは、樹脂粒子をさらに含む、請求項1~5のいずれか1項に記載の製造方法。
- 前記樹脂粒子は、表面が前記第2金属でめっきされている、請求項6に記載の製造方法。
- 前記基材から剥離された前記薄板状接合部材を液体状の熱硬化性樹脂に浸漬する工程をさらに含む、請求項1~7のいずれか1項に記載の製造方法。
- 前記ペーストを加熱する前記温度は、前記溶剤の沸点より高い、請求項1~8のいずれか1項に記載の製造方法。
- 前記薄板状接合部材は、
未反応の前記第2金属の量が、前記薄板状接合部材の総量に対して5質量%以上80質量%以下であり、
前記第1金属と前記第2金属を構成要素として含む金属間化合物の融点が、前記第2金属より高い、
請求項1~9のいずれか1項に記載の製造方法。 - 前記第1金属はCuを含み、前記第2金属はSnを含み、前記金属間化合物はCu6Sn5を含む、請求項10に記載の製造方法。
- 半導体素子と導体部材との間に、請求項1~11のいずれか1項に記載の製造方法で製造される薄板状接合部材を介在させた状態で、前記導体部材上に前記半導体素子を載置する工程と、
前記第1金属の融点より低く前記第2金属の融点より高い温度で、前記薄板状接合部材を加熱する工程と、
を含む、半導体装置の製造方法。 - 前記導体部材上に前記半導体素子を載置する工程の前に、前記半導体素子、前記薄板状接合部材および前記導体部材の少なくとも1つの表面に、液体を付着させる、請求項12に記載の製造方法。
- 前記液体はフラックスを含む、請求項13に記載の製造方法。
- 前記薄板状接合部材を加熱する工程における温度は、前記液体の沸点より高い、請求項13に記載の製造方法。
- 前記薄板状接合部材を加熱する工程における温度は、前記フラックスの沸点より高い、請求項14に記載の製造方法。
- 前記第2金属でめっきされた前記半導体素子を用いる、請求項12~16のいずれか1項に記載の製造方法。
- 前記第2金属でめっきされた前記導体部材を用いる、請求項12~17のいずれか1項に記載の製造方法。
- 前記薄板状接合部材を加熱する工程の前に、前記第2金属を含む金属の薄板を、前記半導体素子と前記薄板状接合部材との間、または、前記薄板状接合部材と前記導体部材との間に挟み込む工程を含む、請求項12~18のいずれか1項に記載の製造方法。
- 前記半導体素子と前記導体部材との間に、前記薄板状接合部材を介在させた状態で、前記導体部材上に前記半導体素子を載置する工程の前に、前記薄板状接合部材に酸処理を施す、請求項12~19のいずれか1項に記載の半導体装置の製造方法。
- 請求項12~20のいずれか1項に記載の製造方法で製造される半導体装置と、入力される電力を変換して出力する主変換回路と、前記主変換回路を制御する制御信号を前記主変換回路に出力する制御回路と、を備える、電力変換装置の製造方法。
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