JP6756062B2 - 半導体装置、および半導体モジュール - Google Patents
半導体装置、および半導体モジュール Download PDFInfo
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- JP6756062B2 JP6756062B2 JP2020085360A JP2020085360A JP6756062B2 JP 6756062 B2 JP6756062 B2 JP 6756062B2 JP 2020085360 A JP2020085360 A JP 2020085360A JP 2020085360 A JP2020085360 A JP 2020085360A JP 6756062 B2 JP6756062 B2 JP 6756062B2
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Description
マルチトランジスタチップにおけるオン抵抗の低減およびチップ反りの抑制について検討する。
本開示に係る半導体装置の一態様は、シリコンからなり第1導電型の不純物を含む半導体基板と、前記半導体基板上に接して形成され、前記半導体基板の前記第1導電型の不純物の濃度より低い濃度の前記第1導電型の不純物を含む低濃度不純物層と、前記半導体基板の裏面上に接して形成された金属材料で構成された裏面電極と、前記低濃度不純物層内の第1の領域に形成された第1の縦型MOSトランジスタと、前記低濃度不純物層内の前記第1の領域に隣接する第2の領域に形成された第2の縦型MOSトランジスタと、を有し、前記第1の縦型MOSトランジスタは前記低濃度不純物層の表面に第1のソース電極と第1のゲート電極を有し、前記第2の縦型MOSトランジスタは前記低濃度不純物層の表面に第2のソース電極と第2のゲート電極を有し、前記半導体基板は、前記第1の縦型MOSトランジスタの第1のドレイン領域および前記第2の縦型MOSトランジスタの第2のドレイン領域の共通ドレイン領域として働き、前記裏面電極の厚さは25μm以上35μm以下であり、前記裏面電極の前記半導体基板と前記低濃度不純物層とを含む半導体層に対する厚さの比は0.32以上である。
まず、準備として、本開示に係る半導体装置の基本的な構造について説明する。本開示に係る半導体装置は、半導体基板に2つの縦型MOSトランジスタを形成した、CSP(チップサイズパッケージ)型のマルチトランジスタチップである。
ここで、マルチトランジスタチップ1のソース−ソース間耐圧(ソース−ソース間ブレークダウン電圧とも言いBVSSと略記する)について説明する。
図3は、実施の形態に係るマルチトランジスタチップのモデルごとの仕様および設計例を示す図である。
本発明者は、比Qの好適範囲を実験により求めた。実験では、モデルごとに、図3に示すエピ厚cおよびパッケージサイズ(対角長L)で、かつAg厚aおよびSi厚bが異なる複数のサンプルを作製した。そして、個々のサンプルのオン抵抗とチップ反りとを実測し、製品規格を満たすか否かを確認した。
図5は、チップ反りWの比Q依存性およびオン抵抗Rの比Q依存性を示すグラフである。図5の左側の縦軸はチップ反りWを表し、右側の縦軸はオン抵抗Rを表し、横軸は比Qを表している。
上記では、全モデルでのオン抵抗規格最大値を達成する比Qの下限値およびチップ反り規格最大値を達成する比Qの上限値を、定数で規定した。これに対し、以下では、比Qの下限値および上限値を、対角長Lに依存して(つまり、対角長Lの関数で)規定することを検討する。
上記では、全モデルに共通して適用される比Qの好適条件を規定した。これに対し、以下では、モデルA、B、およびCのうちのいずれか1つに限定して適用される比Qの好適条件を検討する。
モデルAのマルチトランジスタチップに限定して適用される比Qの好適条件について検討する。
次に、モデルBのマルチトランジスタチップに限定して適用される比Qの好適条件について検討する。
次に、モデルCのマルチトランジスタチップに限定して適用される比Qの好適条件について検討する。
再び図1を参照して、第1のソース電極11および第2のソース電極21と裏面電極31との厚さの比に関する好適条件について説明する。
次に、オン抵抗を低減する電極配置について説明する。
次に、接続信頼性を向上する電極配置について説明する。
次に、オン抵抗を低減する半導体装置の実装構造について説明する。
上記では、マルチトランジスタチップ1を、チップサイズパッケージとして説明したが、マルチトランジスタチップ1は、チップサイズパッケージには限られない。マルチトランジスタチップ1は、樹脂パッケージなどに封止され、半導体パッケージ装置として構成されてもよい。このような半導体パッケージ装置は、例えば、図1および図2に示すマルチトランジスタチップ1を単純に樹脂パッケージなどに封止したものであってもよい。
1a 半導体パッケージ装置
2、2a 制御IC
3 電池
4 負荷
10 トランジスタ(第1の縦型MOSトランジスタ)
10a 第1の領域
11 第1のソース電極
12 第1のソース電極の第1の部分
13 第1のソース電極の第2の部分
14 第1のソース領域
15 第1のゲート導体
16 第1のゲート絶縁膜
18 第1のボディ領域
19 第1のゲート電極
20 トランジスタ(第2の縦型MOSトランジスタ)
20a 第2の領域
21 第2のソース電極
22 第2のソース電極の第1の部分
23 第2のソース電極の第2の部分
24 第2のソース領域
25 第2のゲート導体
26 第2のゲート絶縁膜
28 第2のボディ領域
29 第2のゲート電極
31 裏面電極
32 半導体基板
33 低濃度不純物層
39 共通ドレイン端子
50、59 半導体モジュール
51 プリント配線基板
52 配線パターン
53 ギャップ
54 配線パターンの第1の部分
55 配線パターンの第2の部分
56 半導体装置
Claims (5)
- シリコンからなり第1導電型の不純物を含む半導体基板と、
前記半導体基板の表面に接して形成され、前記半導体基板の前記第1導電型の不純物の濃度より低い濃度の前記第1導電型の不純物を含む低濃度不純物層と、
前記半導体基板の裏面に接して形成された金属材料で構成された裏面電極と、
前記低濃度不純物層内の第1の領域に形成された第1の縦型MOSトランジスタと、
前記低濃度不純物層内の前記第1の領域に隣接する第2の領域に形成された第2の縦型MOSトランジスタと、を有し、
前記第1の縦型MOSトランジスタは前記低濃度不純物層の表面に複数の第1のソース電極と第1のゲート電極を有し、
前記第2の縦型MOSトランジスタは前記低濃度不純物層の表面に複数の第2のソース電極と第2のゲート電極を有し、
前記半導体基板は、前記第1の縦型MOSトランジスタの第1のドレイン領域および前記第2の縦型MOSトランジスタの第2のドレイン領域の共通ドレイン領域として働き、
前記複数の第1のソース電極のうちの1つの第3のソース電極と、前記複数の第2のソース電極のうちの1つの第4のソース電極とは、それぞれ前記第1の領域と前記第2の領域との境界に対して最近のソース電極であって、かつ前記境界の全域に沿って配置されている、半導体装置。 - 前記第3のソース電極と前記第4のソース電極との間隔が、前記第3のソース電極の幅および前記第4のソース電極の幅の何れよりも狭い、請求項1に記載の半導体装置。
- 前記第3のソース電極と前記第4のソース電極との間隔が、前記第3のソース電極の幅および前記第4のソース電極の幅の何れよりも広い、請求項1に記載の半導体装置。
- シリコンからなり第1導電型の不純物を含む半導体基板と、
前記半導体基板の表面に接して形成され、前記半導体基板の前記第1導電型の不純物の濃度より低い濃度の前記第1導電型の不純物を含む低濃度不純物層と、
前記半導体基板の裏面に接して形成された金属材料で構成された裏面電極と、
前記低濃度不純物層内の第1の領域に形成された第1の縦型MOSトランジスタと、
前記低濃度不純物層内の前記第1の領域に隣接する第2の領域に形成された第2の縦型MOSトランジスタと、を有し、
前記第1の縦型MOSトランジスタは前記低濃度不純物層の表面に第1のソース電極と第1のゲート電極を有し、
前記第2の縦型MOSトランジスタは前記低濃度不純物層の表面に第2のソース電極と第2のゲート電極を有し、
前記半導体基板は、前記第1の縦型MOSトランジスタの第1のドレイン領域および前記第2の縦型MOSトランジスタの第2のドレイン領域の共通ドレイン領域として働き、
前記第1のソース電極は、前記第1の領域と前記第2の領域との境界と、前記第1の領域の前記境界の対向端である第1の対向端との間に、前記境界と交差する方向に並ぶ複数の第1のソース電極を含み、
前記第1のゲート電極は、前記第1の対向端の前記境界と平行方向での中央近傍であって、一対の前記第1のソース電極によって前記境界と平行方向に挟まれた位置に配置され、
前記第1のゲート電極の中心点は、前記第1の領域の、前記境界から最遠の第1のソース電極の、前記境界に対する近端より前記第1の対向端側の位置にあり、
前記第2のソース電極は、前記境界と、前記第2の領域の前記境界の対向端である第2の対向端との間に、前記境界と交差する方向に並ぶ複数の第2のソース電極を含み、
前記第2のゲート電極は、前記第2の対向端の前記境界と平行方向での中央近傍であって、一対の前記第2のソース電極によって前記境界と平行方向に挟まれた位置に配置され、
前記第2のゲート電極の中心点は、前記第2の領域の、前記境界から最遠の第2のソース電極の、前記境界に対する近端より前記第2の対向端側の位置にある、半導体装置。 - プリント配線基板と、
前記プリント配線基板上に帯状に設けられ、長手方向に交差するギャップで第1の部分と第2の部分とに分離されている配線パターンと、
前記ギャップ上に配置された請求項1から4の何れか1項に記載の半導体装置と、を備え、
前記半導体装置は、第1の領域と第2の領域とが前記配線パターンの長手方向に並ぶ向きで配置され、
第1のソース電極および第2のソース電極は、前記配線パターンの前記第1の部分および前記第2の部分にそれぞれ接続されている、半導体モジュール。
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