JP2010232369A - 半導体装置 - Google Patents
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Abstract
【解決手段】想像線で示す発熱性半導体素子14の真下に、接合層21が配置されている。同様に、想像線で示す発熱性半導体素子15の真下に、接合層22が配置され、発熱性半導体素子16の真下に、接合層23が配置され、発熱性半導体素子17の真下に、接合層24が配置されている。
【効果】発熱性半導体素子で発生した熱は、図面上から下へ最短距離を進むため、効果的に排熱される。
【選択図】図4
Description
図8は従来の接合方法を説明する図であり、下の金属板111に縞状に金属ナノ粒子112を塗布し、上の金属板113を重ね、トンネル114が消失しない程度の圧力で上の金属板113を押し下げながら加熱する。一定時間、圧力を増やし、温度を上げて接合を行う。
焼結工程では、加熱により先ず有機被膜をガス化して除去し、次に金属ナノ粒子を金属板に焼結接合させる。
この点、特許文献1によれば、トンネル114を介してガスが逃がされるので、良好な接合が行われる。
図9は従来の半導体装置の断面図であり、この半導体装置120では、絶縁基板121の上に回路板122が載せられ、この回路板122の上に発熱性半導体素子124が載せられ、絶縁基板121の下に放熱金属板125が添えられ、この放熱金属板125の下面に金属ナノ粒子からなる接合層126を介してヒートシンク127が添えられている。接合層126には、特許文献1の技術を応用したため、複数条のトンネル128、128が残っている。
そこで、トンネル128の存在を前提とし、伝熱性を高めることができる技術が求められる。
前記接合層は、上から見たときに、前記発熱性半導体素子の下の領域に、隙間無く配置されていることを特徴とする。
図1に示されるように、半導体装置10では、絶縁基板11の上に回路板12、13が載せられ、これらの回路板12、13の上に各々発熱性半導体素子14、16が載せられ、絶縁基板11の下に放熱金属板18が添えられ、この放熱金属板18の下面に金属ナノ粒子からなる接合層21、23を介してヒートシンク25が添えられている。
図3(a)に示す金属ナノ粒子ペースト31を準備する。この金属ナノ粒子ペースト31は、C、H、Oを含む有機被膜32で被覆された金属ナノ粒子33を、分散媒34に分散させてなる。金属ナノ粒子33の金属は銀が好ましい。また、分散媒34は、エチレングリコール、トルエン、テトラデカン、ブタンジオール、低級アルコールの一種又は複数種を含む。
そして、この第2加熱炉38では、プレスパンチ39で抑えながら、大気雰囲気中、150〜300℃の温度で、5〜120分間、第2加熱を実施する。この第2加熱工程により、有機被膜がガス化して除去され、加熱焼結がなされ、接合層が得られる。なお、発生ガス(有機ガス)は、隙間41を通るため、円滑に且つ短い時間で排出される。
図4(図1の4−4線断面図)に示すように、想像線で示す発熱性半導体素子14の領域の下、に、接合層21が配置されている。同様に、想像線で示す発熱性半導体素子15の領域の下に、接合層22が配置され、発熱性半導体素子16の領域の下に、接合層23が配置され、発熱性半導体素子17の領域の下に、接合層24が配置されている。
なお、接合層21〜24の最長辺の長さLは、5mm又はそれ以下とすることが望ましい。その理由は後述する。
実験1は、図1に示す、本発明に係る半導体装置10で行った。実験2は、図9に示す、従来技術に係る半導体装置120で行った。
詳細な実験条件は省略するが、実験1での熱抵抗(℃/W)は0.296であり、実験2での熱抵抗(℃/W)は0.303であった。
熱抵抗が小さいほど、伝熱量(単位時間にある面を通る熱量。単位はW)が大きくなる。すなわち、熱抵抗の逆数が伝熱量に比例する。
すなわち、本発明(実験1)によれば、従来(実験2)よりも、伝熱性が2.3%改善できることが確かめられた。
図5に示すように、Lは3mm、5mm、10mmについて、接合強さを計測した。
結果、3mmと5mmでは48MPaの接合強さが得られ、10mmでは30MPaの接合強さが得られた。
ガス抜きを考えると、Lは小さいほどよいことなり、L=3mmが望まれる。
一方、本発明では、Lの大きさは、発熱性半導体素子の大きさに対応させる必要がある。
図4に示す接合層21と接合層22とを一体化し、接合層23と接合層24とを一体化することができる。この形態は、図6に示される通りである。図4と同一要素は符号を流用し、説明は省略する。
図4に示す接合層21〜24は平面視矩形としたが、平面視で円や楕円にすることもできる。この形態は、図7に示される通りである。図4と同一要素は符号を流用し、説明は省略する。したがって、接合層21〜24の形状は適宜変更することができる。
Claims (3)
- 絶縁基板の上に回路板が載せられ、この回路板の上に発熱性半導体素子が載せられ、前記絶縁基板の下に放熱金属板が添えられ、この放熱金属板の下面に金属ナノ粒子からなる接合層を介してヒートシンクが添えられている半導体装置であって、
前記接合層は、上から見たときに、前記発熱性半導体素子の下の領域に、隙間無く配置されていることを特徴とする半導体装置。 - 前記ヒートシンクは1個であり、前記発熱性半導体素子は複数個であり、これらの発熱性半導体素子は、平面視で隣り合う接合層間に隙間が確保できる程度に、離して配置されていることを特徴とする請求項1記載の半導体装置。
- 前記ヒートシンクは1個であり、前記発熱性半導体素子は複数個であり、これらの発熱性半導体素子は、平面視で左右隣りの接合層間に隙間が確保できる程度に、離して配置されていることを特徴とする請求項1記載の半導体装置。
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011249723A (ja) * | 2010-05-31 | 2011-12-08 | Mitsubishi Electric Corp | 半導体モジュールとその製造方法 |
JP2014160707A (ja) * | 2013-02-19 | 2014-09-04 | Mitsubishi Materials Corp | 接合体の製造方法、パワーモジュールの製造方法、及びパワーモジュール |
WO2016152258A1 (ja) * | 2015-03-23 | 2016-09-29 | 株式会社日立製作所 | 半導体装置 |
JP2018509659A (ja) * | 2015-03-31 | 2018-04-05 | レイセオン カンパニー | ナノ粒子ヒートシンクを含む光学コンポーネント |
JP2018182198A (ja) * | 2017-04-19 | 2018-11-15 | 株式会社東芝 | 半導体装置 |
JP2021118257A (ja) * | 2020-01-27 | 2021-08-10 | 三菱マテリアル株式会社 | ヒートシンク付絶縁回路基板、電子部品及びヒートシンク付絶縁回路基板の製造方法 |
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01106451A (ja) * | 1987-10-20 | 1989-04-24 | Hitachi Ltd | 半導体装置 |
JP2000031357A (ja) * | 1998-07-08 | 2000-01-28 | Sansha Electric Mfg Co Ltd | 電力用半導体モジュール |
JP2006352080A (ja) * | 2005-05-16 | 2006-12-28 | Fuji Electric Holdings Co Ltd | 半導体装置の製造方法および半導体装置 |
JP2007044754A (ja) * | 2005-08-12 | 2007-02-22 | Fuji Electric Device Technology Co Ltd | 金属板接合方法 |
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Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01106451A (ja) * | 1987-10-20 | 1989-04-24 | Hitachi Ltd | 半導体装置 |
JP2000031357A (ja) * | 1998-07-08 | 2000-01-28 | Sansha Electric Mfg Co Ltd | 電力用半導体モジュール |
JP2006352080A (ja) * | 2005-05-16 | 2006-12-28 | Fuji Electric Holdings Co Ltd | 半導体装置の製造方法および半導体装置 |
JP2007044754A (ja) * | 2005-08-12 | 2007-02-22 | Fuji Electric Device Technology Co Ltd | 金属板接合方法 |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011249723A (ja) * | 2010-05-31 | 2011-12-08 | Mitsubishi Electric Corp | 半導体モジュールとその製造方法 |
JP2014160707A (ja) * | 2013-02-19 | 2014-09-04 | Mitsubishi Materials Corp | 接合体の製造方法、パワーモジュールの製造方法、及びパワーモジュール |
WO2016152258A1 (ja) * | 2015-03-23 | 2016-09-29 | 株式会社日立製作所 | 半導体装置 |
JPWO2016152258A1 (ja) * | 2015-03-23 | 2017-09-28 | 株式会社日立製作所 | 半導体装置 |
US10410945B2 (en) | 2015-03-23 | 2019-09-10 | Hitachi, Ltd. | Semiconductor device |
JP2018509659A (ja) * | 2015-03-31 | 2018-04-05 | レイセオン カンパニー | ナノ粒子ヒートシンクを含む光学コンポーネント |
JP2018182198A (ja) * | 2017-04-19 | 2018-11-15 | 株式会社東芝 | 半導体装置 |
JP2021118257A (ja) * | 2020-01-27 | 2021-08-10 | 三菱マテリアル株式会社 | ヒートシンク付絶縁回路基板、電子部品及びヒートシンク付絶縁回路基板の製造方法 |
JP7467936B2 (ja) | 2020-01-27 | 2024-04-16 | 三菱マテリアル株式会社 | ヒートシンク付絶縁回路基板、電子部品及びヒートシンク付絶縁回路基板の製造方法 |
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