JP4904767B2 - 半導体装置 - Google Patents
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Description
ここで、銅ベース1/絶縁基板2の裏面銅箔2c,絶縁基板2の回路パターン2a/半導体チップ3,4を接合する半田材にはクリーム半田あるいは板半田を使用し、リフロー工程を経て半田接合層5を形成している。
また、鉛フリー半田として、Sn,AgのほかにNi,Cuを添加した半田材を適用し、その半田材中に生成した金属間化合物の特性(高温強度)を有効に生かして半導体チップと半導体チップをマウントする放熱基板との間を接合するようにしたものも知られている(例えば、特許文献1参照)。
両角,他2名,「パワー半導体モジュールにおける信頼性設計技術」,冨士時報,富士電機株式会社,平成13年2月10日,第74巻,第2号,p145〜148
このように、半導体チップ/絶縁基板の接合にSn−Ag系の鉛フリー半田を適用して接合した半導体装置について、従来の接合構造では半導体チップの中央部下付近の半田接合層に熱劣化(組織変化)が発生して亀裂が生じるために、長期に亘り高い信頼性を確保することが難しい。
本発明は上記の点に鑑みなされたものであり、その目的は半導体チップ/絶縁基板間の半田接合部について、半導体チップの中央部下付近の接合層に亀裂が発生するのを抑制し、併せて半導体チップ/絶縁基板間の伝熱性を向上させて高いパワーサイクル耐性と長期信頼性の向上が図れるように接合構造を改良した半導体装置を提供することにある。
下面にNiメッキされた半導体チップと、Cuを含む回路パターンと、を備え、前記半導体チップと回路パターンとの間の半田接合面の半導体チップの中央部下に対応する中央面域に対応して、前記回路パターンに台形状の凸部が形成されており、前記半導体チップと回路パターンとの間に前記Sn−Ag系半田を適用して半田層の厚さが5μm以下になるよう設定してリフローし、前記半導体チップの中央部と回路パターンの凸部との間がSn−Ni化合物およびSn−Cu化合物を含む金属間化合物で接合されている半導体装置により達成される。(請求項1)。
また、前記半導体チップと回路パターンとの間の前記中央面域を囲む外周面域において、前記Sn−Ag系半田を適用して形成された半田層の厚さが、前記半導体チップの中央部と回路パターンの凸部との間に形成された半田層の厚さに比べて厚く、外周面域における半田層では前記金属間化合物の成長が一部に止まっている(請求項2)。
そして、半導体チップ3/回路パターン2b間の半田リフロー工程では、前記凸部2b−1を含む回路パターン2a上の接合面域に鉛フリー半田(Sn−Ag系半田)のクリーム半田を印刷するか、あるいは板半田を載せ、この半田の上に半導体チップ3を重ね合わせた上で、炉内に搬入してリフロー半田付けを行う。
これにより、半導体チップ3と回路パターン2bとの間には、図1(a)の断面図で表すように半導体チップ2の中央部下では層の厚さが薄く、外周域では層の厚さが厚い半田接合層5が形成される。
ここで、ナノ金属ペーストは、Ag,Cuなどの金属ナノ粒子,金属ナノ粒子が常温で凝集するのを抑制してナノ粒子を独立分散状態に保持する有機分散材(バインダ),加熱により有機分散材と反応して金属ナノ粒子を裸にする分散材捕捉材、および加熱により前記分散材と分散材捕捉材との反応物質を捕捉して揮散する揮発性有機成分(保護膜)を混合した組成であり、ペーストを加熱することによりバインダ−保護膜間で化学反応が進行してナノ金属粒子が裸の状態になり、その表面活性によりナノ金属粒子間,ナノ金属粒子/接合部の母材(回路パターン,半導体チップの金属メタライズ層)間で低温焼結が進行して最終的に金属同士で直接接合される。
この接合構造によれば、半導体チップ3の中央部と回路パターン2bの凸部2b−1との間が伝熱抵抗の小さなナノ金属粒子接合層8を介して金属接合されるので、従来の半田接合構造で問題となっていた半導体チップ3の中央部下の半田接合層における熱劣化,亀裂の発生(図5参照)を防止し、また、その外周側は層厚の厚い半田接合層5で半導体チップ3/回路パターン2b間が接合されるので、先記の実施例1と同様に熱サイクルでフィレット部に集中する熱応力(剪断応力)が効果的に吸収緩和される。これにより、半導体装置として長期信頼性がより一層向上する。
2 絶縁基板
2b 回路パターン
2b−1 凸部
3 半導体チップ
5 鉛フリー半田の半田接合層
5a 金属間化合物
8 ナノ金属粒子接合層
Claims (2)
- 絶縁基板の回路パターン上にSn−Ag系半田を適用して半導体チップを半田マウントした半導体装置において、
下面にNiメッキされた半導体チップと、
Cuを含む回路パターンと、を備え、
前記半導体チップと回路パターンとの間の半田接合面の半導体チップの中央部下に対応する中央面域に対応して、前記回路パターンに台形状の凸部が形成されており、
前記半導体チップと回路パターンとの間に前記Sn−Ag系半田を適用して半田層の厚さが5μm以下になるよう設定してリフローし、前記半導体チップの中央部と回路パターンの凸部との間がSn−Ni化合物およびSn−Cu化合物を含む金属間化合物で接合されていることを特徴とする半導体装置。 - 前記半導体チップと回路パターンとの間の前記中央面域を囲む外周面域において、前記Sn−Ag系半田を適用して形成された半田層の厚さが、前記半導体チップの中央部と回路パターンの凸部との間に形成された半田層の厚さに比べて厚く、外周面域における半田層では前記金属間化合物の成長が一部に止まっ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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JP2005301427A JP4904767B2 (ja) | 2005-10-17 | 2005-10-17 | 半導体装置 |
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US9466632B2 (en) | 2015-01-09 | 2016-10-11 | Samsung Electronics Co., Ltd. | Image sensor package and an image sensor module having the same |
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JP2007201314A (ja) * | 2006-01-30 | 2007-08-09 | Toyota Central Res & Dev Lab Inc | 半導体装置 |
JP4877046B2 (ja) * | 2007-04-25 | 2012-02-15 | 富士電機株式会社 | 半導体装置およびその製造方法 |
JP5018250B2 (ja) * | 2007-06-04 | 2012-09-05 | 富士電機株式会社 | 半導体装置およびその製造方法 |
JP4961398B2 (ja) * | 2008-06-30 | 2012-06-27 | 株式会社日立製作所 | 半導体装置 |
JP2011054732A (ja) * | 2009-09-01 | 2011-03-17 | Toyota Motor Corp | 半導体モジュール |
JP5479181B2 (ja) * | 2010-03-30 | 2014-04-23 | 株式会社豊田中央研究所 | 絶縁基板とその絶縁基板を有するモジュール |
JP5659663B2 (ja) * | 2010-09-28 | 2015-01-28 | 富士電機株式会社 | 半導体装置及び半導体装置の製造方法 |
JP2013149695A (ja) * | 2012-01-18 | 2013-08-01 | Kobe Steel Ltd | 熱伝導部材およびこれを備えた半導体装置 |
JP5968046B2 (ja) * | 2012-04-26 | 2016-08-10 | 三菱電機株式会社 | 半導体装置および半導体装置の製造方法 |
JP2014154571A (ja) * | 2013-02-05 | 2014-08-25 | Nippon Steel & Sumikin Electronics Devices Inc | パワーモジュール用基板 |
DE102013219642A1 (de) * | 2013-09-27 | 2015-04-02 | Siemens Aktiengesellschaft | Verfahren zum Diffusionslöten unter Ausbildung einer Diffusionszone als Lötverbindung und elektronische Baugruppe mit einer solchen Lötverbindung |
JP6265693B2 (ja) | 2013-11-12 | 2018-01-24 | 三菱電機株式会社 | 半導体装置およびその製造方法 |
KR101922783B1 (ko) * | 2013-11-29 | 2018-11-27 | 가부시키가이샤 고베 세이코쇼 | 베이스판, 및 베이스판을 구비한 반도체 장치 |
JP2018098219A (ja) * | 2015-03-18 | 2018-06-21 | 株式会社日立製作所 | 半導体装置及びその製造方法。 |
JP6366858B2 (ja) * | 2015-11-05 | 2018-08-01 | 三菱電機株式会社 | パワーモジュールの製造方法 |
JP6917127B2 (ja) * | 2016-08-23 | 2021-08-11 | ローム株式会社 | 半導体装置及びパワーモジュール |
JP6726821B2 (ja) * | 2017-01-10 | 2020-07-22 | 株式会社デンソー | 半導体装置の製造方法 |
WO2018220819A1 (ja) * | 2017-06-02 | 2018-12-06 | 三菱電機株式会社 | 半導体素子接合用基板、半導体装置および電力変換装置 |
DE102018131775A1 (de) * | 2018-12-11 | 2020-06-18 | Osram Opto Semiconductors Gmbh | Elektronisches Bauelement und Verfahren zur Herstellung eines elektronischen Bauelements |
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JP4471470B2 (ja) * | 2000-07-25 | 2010-06-02 | 京セラ株式会社 | 半導体装置 |
JP2003142809A (ja) * | 2001-11-05 | 2003-05-16 | Denki Kagaku Kogyo Kk | 金属ベース回路基板及びそれを用いたモジュール |
JP2005064136A (ja) * | 2003-08-08 | 2005-03-10 | Sharp Corp | 窒化物半導体レーザ装置の製造方法 |
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US9466632B2 (en) | 2015-01-09 | 2016-10-11 | Samsung Electronics Co., Ltd. | Image sensor package and an image sensor module having the same |
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