JP2021136423A - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP2021136423A JP2021136423A JP2020034359A JP2020034359A JP2021136423A JP 2021136423 A JP2021136423 A JP 2021136423A JP 2020034359 A JP2020034359 A JP 2020034359A JP 2020034359 A JP2020034359 A JP 2020034359A JP 2021136423 A JP2021136423 A JP 2021136423A
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Abstract
Description
実施の形態1にかかる半導体装置は、シリコン(Si)よりもバンドギャップが広い半導体(ワイドバンドギャップ半導体)を半導体材料として用いて構成される。実施の形態1にかかる半導体装置の構造について、ワイドバンドギャップ半導体として例えば炭化珪素(SiC)を用いた場合を例に説明する。図1は、実施の形態1にかかる半導体装置を半導体基板のおもて面側から見たレイアウトを示す平面図である。
次に、実施の形態2にかかる半導体装置について説明する。図11,12は、実施の形態2にかかる半導体装置を半導体基板のおもて面側から見たレイアウトの一例を示す平面図である。図11に示す実施の形態2にかかる半導体装置20’が実施の形態1にかかる半導体装置20(図1〜4参照)と異なる点は、同一の半導体基板10の活性領域1に、メイン半導体素子11および電流センス部12のみを備える点である。
次に、実施の形態3にかかる半導体装置について説明する。図13は、実施の形態3にかかる半導体装置を半導体基板のおもて面側から見たレイアウトを示す平面図である。図14は、図13の切断線X21−X22における断面構造を示す断面図である。実施の形態3にかかる半導体装置120は、実施の形態1にかかる半導体装置20の構成を適用したJBS(接合障壁ショットキー)構造を備えたSBDである。
1a メイン有効領域
1b,1b’ メイン無効領域
2,142 エッジ終端領域
3 中間領域
10,110 半導体基板
10a〜10c 半導体基板のおもて面の第1〜3面
11 メイン半導体素子
12 電流センス部
12a センス有効領域
12b センス無効領域
13 温度センス部
14 ゲートパッド部
20,20’,120 半導体装置
21a ソースパッド(電極パッド)
21b ゲートパッド(電極パッド)
22 OCパッド(電極パッド)
23a,119 アノードパッド(電極パッド)
23b,125 カソードパッド(電極パッド)
31 n+型ドレイン領域
32,112 n-型ドリフト領域
32a n-型領域
33a,33b n型電流拡散領域
34a,34b,84 p型ベース領域
35a,35b n+型ソース領域
36a,36b,85 p++型コンタクト領域
37a,37b トレンチ
38a,38b ゲート絶縁膜
39a,39b ゲート電極
40,77,117 層間絶縁膜
40a,40b,40c,77a,77b,117a コンタクトホール
41a,41b NiSi膜
42a,42b 第1TiN膜
43a,43b 第1Ti膜
44a,44b 第2TiN膜
45a,45b 第2Ti膜
46a,46b バリアメタル
47a〜47d,121 めっき膜
48a〜48d,122 端子ピン
49a〜49c,123 第1保護膜
50a〜50c,124 第2保護膜
51 ドレイン電極
52 フィールド酸化膜
53 パッシベーション膜
61a,61b,62a,62b,83,101,103,113,114 p+型領域
71,131 n+型出発基板
72,132 n-型炭化珪素層
72a n-型炭化珪素層の厚さを増した部分
73 p型炭化珪素層
74 半導体基板のおもて面の段差
75 p型ポリシリコン層
76 n型ポリシリコン層
80 ゲートランナー
81 ゲートポリシリコン配線層
82 ゲート金属配線層
91 JTE構造のp-型領域
92 JTE構造のp--型領域
93 JTE構造
94,116 n+型チャネルストッパ領域
95,95' ライフタイムキラー導入領域
102,104 n型領域
111 n+型カソード領域
115 p-型領域
118 ショットキー電極
d1 p+型領域の深さ
d2 互いに隣り合うp+型領域間の距離
d3 n型領域の深さ
t1 n-型炭化珪素層の、n+型出発基板上に最初に積層する厚さ
t2 n-型炭化珪素層の、厚さを増した部分の厚さ
t3 p型炭化珪素層の厚さ
t11 n+型出発基板の厚さ
t12 n-型炭化珪素層の厚さ
X 半導体基板のおもて面に平行な方向(第1方向)
Y 半導体基板のおもて面に平行でかつ第1方向と直交する方向(第2方向)
Z 深さ方向
Claims (7)
- シリコンよりもバンドギャップの広いワイドバンドギャップ半導体からなる半導体基板に設けられた活性領域と、
前記半導体基板に設けられ、前記活性領域の周囲を囲む終端領域と、
前記活性領域から前記終端領域にわたって前記半導体基板の内部に設けられた第1導電型領域と、
前記活性領域において前記半導体基板の第1主面と前記第1導電型領域との間に設けられた第2導電型領域と、
前記第1導電型領域と前記第2導電型領域とのpn接合を有し、前記半導体基板の前記第1主面から第2主面に向かう方向または前記第2主面から前記第1主面に向かう方向に電流が流れる縦型半導体素子と、
前記半導体基板の前記第1主面上に設けられ、前記第2導電型領域に電気的に接続された、前記縦型半導体素子の第1電極と、
前記半導体基板の前記第2主面上に設けられ、前記第1導電型領域に電気的に接続された、前記縦型半導体素子の第2電極と、
を備え、
前記活性領域から前記終端領域にわたって前記第1導電型領域の内部に、少数キャリアのライフタイムが短いライフタイムキラー導入領域が設けられていることを特徴とする半導体装置。 - 前記ライフタイムキラー導入領域は、前記終端領域の前記第1主面に延在することを特徴とする請求項1に記載の半導体装置。
- 前記ライフタイムキラー導入領域は、前記終端領域の前記第1主面において、前記活性領域の周囲を囲むことを特徴とする請求項2に記載の半導体装置。
- 前記ライフタイムキラー導入領域には、ワイドバンドギャップ半導体のバンドギャップ内に、ヘリウムまたはプロトンの不純物準位による再結合中心が導入されていることを特徴とする請求項1〜3のいずれか一つに記載の半導体装置。
- 前記半導体基板の前記第1主面に平行な方向に延在するストライプ状に、複数の前記ライフタイムキラー導入領域が設けられていることを特徴とする請求項1〜4のいずれか一つに記載の半導体装置。
- 前記ライフタイムキラー導入領域は、前記第1導電型領域の全体に設けられていることを特徴とする請求項1〜4のいずれか一つに記載の半導体装置。
- 前記pn接合が逆方向バイアスされたときに、前記第1導電型領域の内部に前記活性領域から前記終端領域に向かって空乏層が拡がることを特徴とする請求項1〜6のいずれか一つに記載の半導体装置。
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