JP6447946B1 - 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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- JP6447946B1 JP6447946B1 JP2018135347A JP2018135347A JP6447946B1 JP 6447946 B1 JP6447946 B1 JP 6447946B1 JP 2018135347 A JP2018135347 A JP 2018135347A JP 2018135347 A JP2018135347 A JP 2018135347A JP 6447946 B1 JP6447946 B1 JP 6447946B1
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Abstract
【解決手段】半導体装置1は、第1のゲート電極19と複数の第1のソース電極11と第2のゲート電極29と複数の第2のソース電極21とを有し、第1のゲート電極19は、半導体基板32の一方の短辺121との間に他の電極を挟まずに形成され、複数の第1のソース電極11は、略長方形形状のものを複数含み、複数の略長方形形状の第1のソース電極11は、半導体基板32の長辺方向と平行にストライプ状に形成され、第2のゲート電極29は、半導体基板32の他方の短辺122との間に他の電極を挟まずに形成され、複数の第2のソース電極21は、略長方形形状のものを複数含み、複数の略長方形形状の第2のソース電極21は、半導体基板32の長辺方向と平行にストライプ状に形成される。
【選択図】図2A
Description
[1.半導体装置の基本構造]
以下、本開示に係る半導体装置1の構造について説明する。本開示に係る半導体装置1は、半導体基板32に2つの縦型MOS(Metal Oxide Semiconductor)トランジスタを形成した、CSP(Chip Size Package: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。上記2つの縦型MOSトランジスタは、パワートランジスタであり、いわゆる、トレンチMOS型FET(Field Effect Transistor)である。
図3は、スマートホンなどの充放電回路であり、半導体装置1をこの充放電回路のローサイド側に挿入して、双方向の電流の導通を制御する充放電スイッチとして使用する場合を一応用例として示している。
図4は、実施の形態に係る半導体装置1の実装構造の一例を示す分解斜視図であり、半導体装置1を実装した半導体モジュール50の例を示している。
半導体装置1が実装基板51にフェースダウン状態でリフロー実装される場合には、複数の第1のソース電極11、第1のゲート電極19、複数の第2のソース電極21および第2のゲート電極29は、はんだなどの接合材を介して、実装基板51上に設けられた基板電極と接合される。
また、図5A、図5Bに示されるように、半導体装置1が反っているときの、長辺方向中央部と遠端部の高低差を反り量と呼ぶ。
発明者らは、長辺方向の長さが3.40mm、短辺方向の長さが1.96mm、半導体層40の厚さが70μm、金属層31の厚さが30μmの半導体装置1について、その電極(図2Aまたは図2Bにおける、第1のソース電極11、第2のソース電極21、第1のゲート電極19、第2のゲート電極29)の配置位置、形状を変更したサンプルを複数種類作成した。
まず、図9から、サンプル1とサンプル2とサンプル3とのいずれもが、比較サンプルよりもソース電極のはんだ不具合が少ないことがわかる。すなわち、略長方形形状のソース電極の長辺方向を半導体基板32の長辺方向に対して、直交して形成するよりも平行に形成する方が、ソース電極のはんだ不具合の発生数を抑制できることがわかる。
上述の「電極を長辺方向の両端部寄りに形成すれば接合が十分になる」メカニズムより、第1のゲート電極19及び第2のゲート電極29の形成位置については、第1のゲート電極19を一方の短辺121近傍に形成し、第2のゲート電極29を他方の短辺122近傍に形成すればよいので、第1のゲート電極19を、半導体基板32の平面視において、半導体基板32の一方の短辺121との間に他の電極を挟まないようなレイアウト配置にしてもよい。
この構成によれば、第2のゲート電極29のオープン不良の発生頻度が低減される。
半導体モジュール50が製品として使用される環境温度の変化や実装基板51の経時変化等によって実装基板51に反りが生じることがあり、そのような場合でも半導体装置1と実装基板51とを接触させないようにする必要がある。
2 制御IC
3 電池
4 負荷
10 第1の縦型MOSトランジスタ
11、11a、11b、11c、11d 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 第2の縦型MOSトランジスタ
21、21a、21b、21c、21d 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 金属層
32 半導体基板
33 低濃度不純物層
34 層間絶縁膜
35 パッシベーション層
40 半導体層
50 半導体モジュール
51 実装基板
52、56、57 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
101 第1の領域
102 第2の領域
103 境界線
121 一方の短辺
122 他方の短辺
211、211a、211b、211c、211d 第1のソース基板電極
219 第1のゲート基板電極
221、221a、221b、221c、221d 第2のソース基板電極
229 第2のゲート基板電極
300、300a、300b、300c、300d 接合材
301 第1の接合面
302 第2の接合面
303 側面
Claims (15)
- 第1導電型の不純物を含む長方形の半導体基板と、
前記半導体基板の上面に接触して形成され、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、
前記半導体基板の下面全面に接触して形成され、金属材料のみで構成された金属層とからなり、
常温時に前記半導体基板の長辺方向に沿って湾曲しているフェースダウン実装チップサイズパッケージ型半導体装置であって、
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の領域に隣接された第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のゲート電極と複数の第1のソース電極とを有し、
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のゲート電極と複数の第2のソース電極とを有し、
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のソース電極から前記第1のドレイン領域、前記金属層および前記第2のドレイン領域を経由した前記第2のソース電極までの双方向経路を主電流経路とし、
前記第1のゲート電極は、前記半導体基板の平面視において、前記半導体基板の一方の短辺との間に他の電極を挟まずに形成され、
前記複数の第1のソース電極は、前記半導体基板の平面視において、略長方形形状のものを複数含み、
前記複数の略長方形形状の第1のソース電極は、前記半導体基板の平面視において、前記半導体基板の長辺方向と平行にストライプ状に形成され、
前記第2のゲート電極は、前記半導体基板の平面視において、前記半導体基板の他方の短辺との間に他の電極を挟まずに形成され、
前記複数の第2のソース電極は、前記半導体基板の平面視において、略長方形形状のものを複数含み、
前記複数の略長方形形状の第2のソース電極は、前記半導体基板の平面視において、前記半導体基板の長辺方向と平行にストライプ状に形成され、
前記第1の領域と前記第2の領域との境界線は、前記半導体基板の平面視において、略線分であり、
前記第1のゲート電極および前記複数の第1のソース電極と、前記第2のゲート電極および前記複数の第2のソース電極とは、前記半導体基板の平面視において、前記境界線を対称軸とする線対称の位置に形成された
フェースダウン実装チップサイズパッケージ型半導体装置。 - 前記第1のゲート電極は、前記半導体基板の平面視において、前記一方の短辺の中央近傍に形成され、
前記第2のゲート電極は、前記半導体基板の平面視において、前記他方の短辺の中央近傍に形成された
請求項1に記載の半導体装置。 - 前記複数の第1のソース電極のうちの少なくとも1対は、前記半導体基板の平面視において、前記第1のゲート電極に対して、前記一方の短辺方向の両側に形成され、該1対の第1のソース電極と前記一方の短辺との最近接距離は、前記第1のゲート電極の前記境界線側端と前記一方の短辺との距離との最近接距離以下であり、
前記複数の第2のソース電極のうちの少なくとも1対は、前記半導体基板の平面視において、前記第2のゲート電極に対して、前記他方の短辺方向の両側に形成され、該1対の第2のソース電極と前記他方の短辺との最近接距離は、前記第2のゲート電極の前記境界線側端と前記他方の短辺との距離との最近接距離以下である
請求項2に記載の半導体装置。 - 前記半導体基板の平面視において、前記複数の第1のソース電極と前記一方の短辺との第1の最近接距離は、前記半導体基板の短辺方向における前記第1のゲート電極の最大幅以下である
請求項3に記載の半導体装置。 - 前記半導体基板の平面視において、前記第1の最近接距離は、前記複数の第1のソース電極と前記境界線との第2の最近接距離よりも長い
請求項4に記載の半導体装置。 - 前記半導体基板の平面視において、前記複数の第1のソース電極と前記第1のゲート電極との第3の最近接距離は、前記半導体基板の短辺方向における前記第1のゲート電極の最大幅以上である
請求項5に記載の半導体装置。 - 前記半導体基板の平面視において、前記複数の第1のソース電極のうちの少なくとも1つの、前記半導体基板の短辺方向における最大幅は、0.25mm以上0.35mm以下である
請求項1に記載の半導体装置。 - 前記半導体基板の平面視において、前記複数の第1のソース電極と前記半導体基板の長辺との最近接距離は0.08mm以上である
請求項1に記載の半導体装置。 - 前記半導体基板の平面視において、前記半導体基板の長辺方向における前記第1のゲート電極の最大幅は、前記半導体基板の短辺方向における前記第1のゲート電極の最大幅と等しいか、または前記半導体基板の短辺方向における前記第1のゲート電極の最大幅よりも広い
請求項1に記載の半導体装置。 - 請求項1に記載の半導体装置が、実装基板に対して前記湾曲の凹状面が対向してフェースダウン実装された半導体モジュールであって、
前記実装基板は、前記第1のゲート電極と接合材を介して接続され、前記実装基板の上面に形成されたゲート基板電極を有し、
前記ゲート基板電極は、前記実装基板の平面視において、前記半導体基板の短辺方向における最大幅よりも、前記半導体基板の長辺方向における最大幅の方が広い
半導体モジュール。 - 請求項1に記載の半導体装置が、実装基板に対して前記湾曲の凹状面が対向してフェースダウン実装された半導体モジュールであって、
前記実装基板は、前記第1のゲート電極と接合材を介して接続され、前記実装基板の上面に形成されたゲート基板電極を有し、
前記半導体基板の平面視における前記ゲート電極の面積と前記実装基板の平面視における前記ゲート基板電極の面積とは互いに異なる
半導体モジュール。 - 請求項1に記載の半導体装置が、実装基板に対して前記湾曲の凹状面が対向してフェースダウン実装された半導体モジュールであって、
前記実装基板は、前記第1のゲート電極と接合材を介して接続され、前記実装基板の上面に形成されたゲート基板電極を有し、
前記接合材は、
前記第1のゲート電極に接合された第1の接合面と、
前記ゲート基板電極に接合された第2の接合面と、
前記第1の接合面と前記第2の接合面とに挟まれた側面とを有し、
前記実装基板に垂直な平面による前記側面の断面は、直線、または前記接合材側へ凹んだ曲線である
半導体モジュール。 - 請求項1に記載の半導体装置が、複数の接合材を介して、実装基板に対して前記湾曲の凹状面が対向してフェースダウン実装された半導体モジュールであって、
前記複数の接合材のうち、前記半導体基板の平面視において前記一方の短辺との距離が最短である第1の接合材の、前記一方の短辺側端位置の厚さをh1とし、
前記境界線の位置における前記半導体装置と前記実装基板との間隔をy1とし、
前記一方の短辺の位置における前記半導体装置と前記実装基板との間隔をy2とし、
前記半導体基板の長辺方向の長さをLとし、
前記半導体基板の平面視において、前記第1のゲート電極および前記複数の第1のソース電極と前記一方の短辺との最近接距離をAとした時、
θ=arcsin(2×(y1−y2)/L)
h1 > A×sinθ + y2
を満足する
半導体モジュール。 - 前記複数の接合材のうち、前記半導体基板の平面視において前記境界線との距離が最短である第2の接合材の、前記境界線側端位置の厚さをh2とし、
前記半導体基板の平面視において、前記第1のゲート電極および前記複数の第1のソース電極と前記境界線との最近接距離をBとした時、
h2 > (L/2−B)×sinθ + y2
を満足する
請求項13に記載の半導体モジュール。 - 請求項1に記載の半導体装置が、実装基板に対して前記湾曲の凹状面が対向してフェースダウン実装された半導体モジュールであって、
前記半導体基板の平面視において、前記第1のゲート電極および前記複数の第1のソース電極と前記一方の短辺との最近接距離をCとした時、
前記半導体装置と前記実装基板との最近接間隔は0.02×C以上である
半導体モジュール。
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JP2020181968A (ja) * | 2019-04-26 | 2020-11-05 | 住友電気工業株式会社 | 炭化珪素半導体モジュールおよび炭化珪素半導体モジュールの製造方法 |
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