JP2008270455A - パワー半導体モジュール - Google Patents
パワー半導体モジュール Download PDFInfo
- Publication number
- JP2008270455A JP2008270455A JP2007110196A JP2007110196A JP2008270455A JP 2008270455 A JP2008270455 A JP 2008270455A JP 2007110196 A JP2007110196 A JP 2007110196A JP 2007110196 A JP2007110196 A JP 2007110196A JP 2008270455 A JP2008270455 A JP 2008270455A
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- power semiconductor
- epoxy resin
- semiconductor module
- chip
- aluminum wire
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Abstract
【解決手段】パワー半導体チップ表面と外部回路パタンとがアルミワイヤで接続され、エポキシ樹脂により封止されるパワー半導体モジュールにおいて、アルミワイヤの線径を0.4±0.05mmφとし、モジュール定格温度範囲におけるエポキシ樹脂の平均線膨張係数を15〜20ppm/Kとする。
【選択図】図1
Description
Mauro Ciappa Selected failure mechanisms of modern power modules.Microelectronics Reliability 2002; 42: p.653-667
図1は、本発明の実施形態に係るパワー半導体モジュール(定格電圧/電流は600V/400AのIGBTモジュール100)の断面図である。同図に示すように、IGBTチップ104表面とエミッタパタン110とがアルミワイヤ102で接続され、銅ベース115より上の部分がエポキシ樹脂101により封止されている。
一般に、エポキシ樹脂とニッケルメッキ層は良好な接着性を有しない。このため、モジュール動作時の熱応力により、内蔵部品(特にSiN基板)とエポキシ樹脂が剥離し、各種接着はんだ層及びアルミワイヤ配線が劣化してしまう場合がある。
パワー半導体モジュールを線膨張係数の異なる2種類のエポキシ樹脂で封止をすれば、アルミワイヤ破断、Siクラックに対して各々個別に対処できるようになり、より安定したモジュール品質、寿命を実現することが可能となる。例えば、Siクラックに対しては、上述のように平均線膨張係数の低いエポキシ樹脂を用いた方が樹脂界面剥離を防止でき、モジュールを長寿命化することができる。
図13は、本発明の実施形態に係るパワー半導体モジュール(IGBTモジュール1200)の断面図であり、特にIGBTチップ104周辺部を拡大表示したものである。同図に示すように、エポキシ樹脂1202はシリカフィラー1201を含んでいる。フィラー1201は、エポキシ樹脂1202の平均線膨張係数α及び弾性率を調整するものである。
一般に、IGBTチップのエミッタ電極は、複数の電極要素に分割されており、それら電極要素は各電極要素の長手方向に直交する方向に並んでいる。また、IGBTチップは発熱時にチップ中央が高くチップ周辺が低くなるという温度分布を持つ。これは、チップ中央が発熱体の中心部であるのに対し、チップ周辺は印加コレクタ電圧緩和層(FLRと呼ばれる。)という主電流が流れない非発熱領域であるためである。実際にIGBTチップの温度分布を測定みると、チップ中央のゲート電極近傍の電極要素の温度は150℃(最大)、チップ周囲の温度は100℃であり、両者の間に50degもの温度差があることが分かる。このように大きな温度差がある場合、チップ中央部からアルミワイヤの劣化断線が始まり、次第に周辺へと劣化が進む。
本実施形態の目的及び効果は実施形態5のそれと同じである。
Claims (13)
- パワー半導体チップ表面と外部回路パタンとがアルミワイヤで接続され、エポキシ樹脂により封止されるパワー半導体モジュールであって、
前記アルミワイヤの線径は、0.4±0.05mmφであり、
モジュール定格温度範囲における前記エポキシ樹脂の平均線膨張係数は、15〜20ppm/Kである、
ことを特徴とするパワー半導体モジュール。 - 請求項1に記載のパワー半導体モジュールにおいて、
モジュール定格温度範囲における前記エポキシ樹脂の平均線膨張係数は、18ppm/K±10%である、
ことを特徴とするパワー半導体モジュール。 - 請求項1又は2に記載のパワー半導体モジュールにおいて、
前記エポキシ樹脂と、前記パワー半導体チップおよび該パワー半導体チップを搭載した基板との間に、ポリアミド樹脂によるコーティング層を設ける、
ことを特徴とするパワー半導体モジュール。 - 請求項3に記載のパワー半導体モジュールにおいて、
前記コーティング層の厚さは、10μm以下である、
ことを特徴とするパワー半導体モジュール。 - パワー半導体チップ表面と外部回路パタンとがアルミワイヤで接続され、エポキシ樹脂により封止されるパワー半導体モジュールであって、
前記パワー半導体チップ近傍のエポキシ樹脂の線膨張係数は、該パワー半導体チップ近傍から封止表面までのエポキシ樹脂の線膨張係数よりも低い、
ことを特徴とするパワー半導体モジュール。 - 請求項5に記載のパワー半導体モジュールにおいて、
前記パワー半導体チップ近傍のエポキシ樹脂におけるフィラー含有率は、該パワー半導体チップ近傍から封止表面までのエポキシ樹脂におけるフィラー含有率よりも高い、
ことを特徴とするパワー半導体モジュール。 - 請求項5又は6に記載のパワー半導体モジュールにおいて、
前記パワー半導体チップ近傍のエポキシ樹脂の線膨張係数は、該パワー半導体チップ近傍から封止表面までのエポキシ樹脂の線膨張係数の1/2程度である、
ことを特徴とするパワー半導体モジュール。 - 請求項7に記載のパワー半導体モジュールにおいて、
モジュール定格温度範囲における、前記パワー半導体チップ近傍のエポキシ樹脂の平均線膨張係数は10ppm/K程度であり、該パワー半導体チップ近傍から封止表面までのエポキシ樹脂の平均線膨張係数は20ppm/K程度である、
ことを特徴とするパワー半導体モジュール。 - 請求項5から8のいずれかに記載のパワー半導体モジュールにおいて、
前記エポキシ樹脂は、第1エポキシ樹脂と第2エポキシ樹脂から構成され、
前記第1エポキシ樹脂は、前記パワー半導体チップが搭載された基板から該パワー半導体チップの裏面と表面の間の高さまでを封止し、
前記第2エポキシ樹脂は、前記第1エポキシ樹脂より上の部分を封止する、
ことを特徴とするパワー半導体モジュール。 - 各電極要素がその長手方向に直交する方向に並ぶようパワー半導体チップ表面の電極が複数の電極要素に分割されたパワー半導体モジュールであって、
前記各電極要素の長手方向に直交する方向における、前記パワー半導体チップの中央付近の電極要素に接続されるアルミワイヤほどその強度が高められている、
ことを特徴とするパワー半導体モジュール。 - 請求項10に記載のパワー半導体モジュールであって、
前記アルミワイヤの強度は、本数を増やすことにより高められる、
ことを特徴とするパワー半導体モジュール。 - 請求項10又は11に記載のパワー半導体モジュールであって、
前記アルミワイヤの強度は、線径を大きくすることにより高められる、
ことを特徴とするパワー半導体モジュール。 - 請求項12に記載のパワー半導体モジュールにおいて、
前記アルミワイヤの線径は、最大0.5mmφであり、最小0.3mmφである、
ことを特徴とするパワー半導体モジュール。
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