JPWO2017199580A1 - 絶縁ゲート型半導体装置及び絶縁ゲート型半導体装置の製造方法 - Google Patents
絶縁ゲート型半導体装置及び絶縁ゲート型半導体装置の製造方法 Download PDFInfo
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- JPWO2017199580A1 JPWO2017199580A1 JP2018518131A JP2018518131A JPWO2017199580A1 JP WO2017199580 A1 JPWO2017199580 A1 JP WO2017199580A1 JP 2018518131 A JP2018518131 A JP 2018518131A JP 2018518131 A JP2018518131 A JP 2018518131A JP WO2017199580 A1 JPWO2017199580 A1 JP WO2017199580A1
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- path member
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- main current
- insulated gate
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Abstract
Description
しかし特許文献1の技術を用いても、スイッチング時のターンオン動作の高速化は十分とはいえず、スイッチング損失を低減できる更なる新技術が求められていた。
また本明細書及び添付図面においては、n又はpを冠した領域や層では、それぞれ電子又は正孔が多数キャリアであることを意味する。またnやpに付す+や−は、+及び−が付記されていない半導体領域に比して、それぞれ相対的に不純物濃度が高い又は低い半導体領域であることを意味する。但しn+とn+のように同じ濃度を示す表記であっても、実際に同じ不純物濃度であることに限定するものではない。
本発明の実施の形態に係る絶縁ゲート型半導体装置の実装構造は、図1に示すように、1個又は2個以上の電力用スイッチング素子を構成する半導体チップQjからなる絶縁ゲート型半導体素子を備える。半導体チップQjは、高熱伝導性を有する絶縁回路基板100上に搭載している。
絶縁回路基板100は、パッケージ基板をなす。符号「Qj」中に付された「j」は、j=1〜nの値を取り、nは1以上の正数である。また図1では絶縁回路基板100上に搭載された複数の電力用スイッチング素子の内の1個の半導体チップQjについて、その要部の断面構造を模式的に図示している。
ゲート電極5は、ドリフト領域1の上面上に、複数のベース領域2a,2bに跨って設けられている。ゲート電極5の表面上には層間絶縁膜6が積層され、この層間絶縁膜6の上にエミッタ電極7が積層されている。エミッタ電極7は、図1中の層間絶縁膜6中に描かれた破線で模式的に示すように、ビア等を介してエミッタ領域3a,3bに電気的に接続されている。
直線状の主電流経路部材21及び直線状のゲート電流経路部材20を互いに平行にすることにより、主電流経路部材21を中心とする主電流に起因する円状の磁束が、ゲート電流経路部材20に鎖交する。ゲート電流経路部材20は、絶縁回路基板100上で、主電流Icに最も近い位置で前記磁束と鎖交している。
ビオサバールの法則から直線電流の造る磁界は電流値に比例するので、例えば600A程度以上の大電流を扱うパワー半導体装置の場合には寄生インダクタンスが非常に大きくなる。よって大電流を扱う定格容量が大きいパワー半導体装置の場合には、帰還容量Cresによるターンオン動作が遅くなる。
一方、ゲート電流Igを強化しない比較例の場合、図5A中に例示するように、時刻t=t0からゲート電流Igが流れ始める点は、ゲート電流Igを強化した場合と同じである。しかし時刻t=t1で主電流Icが流れ始めてオン状態となっても、図4Aのゲート電流Igを強化した場合よりもゲート電流Igがゼロレベルになるまでに長い時間がかかる。図5Cに示すように、比較例に係る絶縁ゲート型半導体装置の場合、コレクタ・エミッタ間電圧Vceの値は時刻t=t3を過ぎた時点でもかなり大きく、時刻t=t4に至ってようやくゼロになる。
次に、図1に示した本発明の実施の形態に係る絶縁ゲート型半導体装置の製造方法を、主電流経路部材21及びゲート電流経路部材20が、半導体モジュールにおける回路パターンである場合を例に説明する。尚、以下に述べる絶縁ゲート型半導体装置の製造方法は一例であり、特許請求の範囲に記載した趣旨の範囲内であれば、この変形例を含めて、これ以外の種々の製造方法により、実現可能であることは勿論である。
本発明は上記の開示した実施の形態によって説明したが、この開示の一部をなす論述及び図面は、本発明を限定するものであると理解すべきではない。この開示から当業者には様々な代替実施の形態、実施例及び運用技術が明らかになると考えられるべきである。
また半導体チップは1枚である必要はなく、実際には電力用半導体装置の定格容量が要請する個数の複数の半導体チップを用いてスイッチング素子を実現できる。大電流を扱う半導体装置になるほど、本発明の効果は顕著になる。
2a,2b ベース領域
3a,3b エミッタ領域
4 ゲート絶縁膜
5 ゲート電極
6 層間絶縁膜
7 エミッタ電極
8 バッファ層
9 コレクタ領域
10 コレクタ電極
20 ゲート電流経路部材
21 主電流経路部材
22 補助主電流経路部材
30 第2の外部端子
31,32 第1の外部端子
40 ゲート駆動回路
100 絶縁回路基板
A ゲート電流強化領域
I1 誘導電流
Ic,Ic1,Ic2 主電流
Ig ゲート電流
Vce コレクタ・エミッタ間電圧
Qj 半導体チップ
Claims (4)
- 半導体チップからなる絶縁ゲート型半導体素子と、
前記半導体チップを搭載し、周辺に第1の外部端子及び第2の外部端子を有する絶縁回路基板と、
前記絶縁回路基板上に平面パターンで直線状に延びる部分を有するようにパターニングされ、前記第1の外部端子と前記絶縁ゲート型半導体素子の主電極領域との間を接続して設けられ、前記絶縁ゲート型半導体素子の主電流が前記第1の外部端子に向かって流れる主電流経路部材と、
前記絶縁回路基板上に平面パターンで前記主電流経路部材の直線状に延びる部分と平行配置され直線状に延びる部分を有するようにパターニングされ、前記第2の外部端子と前記絶縁ゲート型半導体素子のゲート電極との間を接続して設けられ、平行配置された前記部分において、前記主電流を制御するゲート電流が前記主電流と反対方向に向かって流れるゲート電流経路部材と、を備え、
前記主電流の生成する磁界の変化で生じる相互誘導によって前記ゲート電流経路部材に発生する電流を前記絶縁ゲート型半導体素子のターンオン時の前記ゲート電流の増大に用いることを特徴とする絶縁ゲート型半導体装置。 - 前記ゲート電流経路部材及び前記主電流経路部材は、隣接して設けられていることを特徴とする請求項1に記載の絶縁ゲート型半導体装置。
- 前記ゲート電流経路部材の前記主電流経路部材と反対側に、補助主電流経路部材が更に設けられていることを特徴とする請求項1又は2に記載の絶縁ゲート型半導体装置。
- 半導体チップからなる絶縁ゲート型半導体素子を用意する工程と、
絶縁回路基板上に、平面パターンで直線状に延びる部分を有する主電流経路部材と、平面パターンで前記主電流経路部材の直線状に延びる部分と平行配置され直線状に延びる部分を有するゲート電流経路部材とをパターニングする工程と、
前記半導体チップを絶縁回路基板上に搭載する工程と、
前記主電流経路部材と前記絶縁ゲート型半導体素子の主電極領域の間を接続する工程と、
前記ゲート電流経路部材と前記絶縁ゲート型半導体素子のゲート電極の間を前記絶縁ゲート型半導体素子の主電流を制御するゲート電流が前記主電流と反対方向に向かって流れる方向となるように接続する工程と、
を含むことを特徴とする絶縁ゲート型半導体装置の製造方法。
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