JPWO2020149354A1 - 半導体装置および半導体装置の製造方法 - Google Patents
半導体装置および半導体装置の製造方法 Download PDFInfo
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Abstract
Description
実施の形態1にかかる半導体装置の構造について、逆導通IGBT(RC−IGBT:Reverse Conducting IGBT)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。図2は、図1の一部を拡大して示す平面図である。図2には、半導体基板(半導体チップ)10の活性領域41とエッジ終端領域42との境界付近Aを示す。
次に、実施の形態2にかかる半導体装置の構造について説明する。図7は、実施の形態2にかかる半導体装置の水素イオン照射により蓄積領域(第4半導体領域)21を形成した場合のIGBT領域における不純物濃度分布を示す特性図である。図8は、実施の形態2にかかる半導体装置のIGBT領域における電気的な諸特性の分布を示す特性図である。実施の形態2にかかる半導体装置を半導体基板10のおもて面側から見たレイアウトおよび断面構造は、実施の形態1にかかる半導体装置30と同様であり、図1〜3の符号21を符号61に代えたものとなる。図7には、図3の切断線C1−C2における濃度分布を示す。図7は、活性されていない不純物元素も含めた不純物元素の濃度分布である。図8には、図3の切断線C1−C3における電気的な諸特性の分布を示す。
次に、実施の形態3にかかる半導体装置の構造について説明する。図9は実施の形態3にかかる半導体装置の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が実施の形態1にかかる半導体装置と異なる点は、水素イオン照射により形成される蓄積領域71がp-型ベース領域2から離間している点である。図10は、実施の形態3にかかる半導体装置の水素イオン照射により蓄積領域(第4半導体領域)21を形成した場合のIGBT領域における不純物濃度分布を示す特性図である。図10は、活性されていない不純物元素も含めた不純物元素の濃度分布である。
次に、実施の形態4にかかる半導体装置の構造について説明する。図12は、実施の形態4にかかる半導体装置の水素イオン照射により蓄積領域(第4半導体領域)21を形成した場合のIGBT領域における不純物濃度分布を示す特性図である。図12には、図3の切断線C1−C2における濃度分布を示す。実施の形態4にかかる半導体装置を半導体基板10のおもて面側から見たレイアウトおよび断面構造は、実施の形態1にかかる半導体装置30と同様であり、図1〜3の符号2を符号2’に代えたものとなる。
2,2’ p-型ベース領域
3 n++型エミッタ領域
4 p+型コンタクト領域
5 ゲートトレンチ部
6 ゲートトレンチ
7 ゲート絶縁膜
8 ゲート電極
9 層間絶縁膜
9a,9b,9b’,9c コンタクトホール
10 半導体基板
10a 半導体基板のおもて面
10b 半導体基板の裏面
11 エミッタ電極
12 ゲートパッド
13 ゲート配線層
14a ゲートランナー
14b,14b’ 導電層
15 ダミートレンチ部
16 ダミートレンチ
17 ダミーゲート絶縁膜
18 ダミーゲート電極
19a,19b 結晶欠陥領域
21,61,71 蓄積領域
21a,21b,61a,71a,71b,81a 蓄積領域の水素濃度分布
22 結晶欠陥
23 n+型バッファ領域
24 p++型コレクタ領域
25 p++型コレクタ領域またはn++型カソード領域
25a,25a’ p++型コレクタ領域とn++型カソード領域との境界
26 n++型カソード領域
27 コレクタ電極
28 p+型ウェル領域
30 半導体装置
31 IGBT領域
32 FWD領域
41 活性領域
42 エッジ終端領域
51,51’ プロトン通過領域
52,52’ 水素ドナー領域
61b 蓄積領域内の水素以外のn型不純物分布
62a 蓄積領域中の水素原子によるネットドーピング濃度分布
62b 蓄積領域中の水素以外のn型不純物によるネットドーピング濃度分布
63a 蓄積領域中の水素原子によるキャリア濃度分布
63b 蓄積領域中の水素以外のn型不純物によるキャリア濃度分布
81b p-型ベース領域内の水素濃度分布
Db p-型ベース領域内の水素濃度のピーク値
Dc 蓄積領域の水素濃度のピーク値
Kb n+型バッファ領域内に結晶欠陥密度のピーク位置
Ks 結晶欠陥領域内の結晶欠陥密度のピーク位置
Ks’ キャリアライフタイムが最小値となる深さ位置
Pb11 p-型ベース領域内の水素濃度のピーク位置
Pc,Pc’ 蓄積領域の水素濃度のピーク位置
Ph,Ph1,Ph2 水素イオン照射の飛程位置
Rp 水素イオン照射の飛程
S 蓄積領域の水素濃度分布の裾
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な方向でかつ第1方向と直交する方向(第2方向)
Z 深さ方向
Claims (20)
- 半導体基板と、
前記半導体基板の深さ方向の内部に設けられ、前記半導体基板のドーパントのドーピング濃度よりも高いドーピング濃度を有し、前記半導体基板のおもて面から前記半導体基板の深さ方向に予め定められた距離離間した第1深さ位置にドーピング濃度分布のピークを有し、前記第1深さ位置よりも前記半導体基板の裏面側に、前記ピークよりもドーピング濃度が小さいドーピング濃度分布の裾を有する水素ドナーと、
前記半導体基板の深さ方向に、前記第1深さ位置よりも前記半導体基板の裏面側で、前記半導体基板のおもて面側に結晶欠陥密度が最大となる第2深さ位置を有する結晶欠陥領域と、
を備えることを特徴とする半導体装置。 - 半導体基板の内部に設けられた第1導電型の第1半導体領域と、
前記半導体基板の内部において、前記第1半導体領域よりも前記半導体基板のおもて面側に設けられた第2導電型の第2半導体領域と、
前記半導体基板の内部において、前記第1半導体領域よりも前記半導体基板の裏面側に設けられた、前記第1半導体領域よりも不純物濃度の高い第3半導体領域と、
前記半導体基板の内部において、前記第2半導体領域よりも前記半導体基板の裏面側で、前記半導体基板のおもて面に平行な方向に、前記第1半導体領域に接して選択的に設けられた、前記第1半導体領域よりも不純物濃度の高い第1導電型の第4半導体領域と、
前記半導体基板の裏面と前記第4半導体領域との間に設けられ、前記半導体基板のおもて面側に結晶欠陥密度が最大となる第1深さ位置を有する結晶欠陥領域と、
前記半導体基板のおもて面に設けられ、前記第2半導体領域に電気的に接続された第1電極と、
前記半導体基板の裏面に設けられ、前記第3半導体領域に電気的に接続された第2電極と、
を備え、
前記第4半導体領域は、不純物として水素原子を含み、前記半導体基板のおもて面側で水素濃度が最大となる第2深さ位置を含む領域に配置され、
前記結晶欠陥領域の結晶欠陥密度は前記半導体基板中で最大であることを特徴とする半導体装置。 - 前記半導体基板のおもて面から深さ方向に延在して、側壁と前記第2半導体領域とが接し、前記第1半導体領域または前記第4半導体領域に達するトレンチと、
前記トレンチの内部に絶縁膜を介して設けられた第3電極と、
をさらに備えることを特徴とする請求項2に記載の半導体装置。 - 前記第4半導体領域は、前記半導体基板のおもて面に平行な方向に前記トレンチに達することを特徴とする請求項3に記載の半導体装置。
- 前記第4半導体領域は、前記第2半導体領域に接することを特徴とする請求項2〜4のいずれか一つに記載の半導体装置。
- 前記第2半導体領域の内部に選択的に設けられた第1導電型の第5半導体領域をさらに備え、
前記第3半導体領域は、第2導電型であり、
前記トレンチは、前記半導体基板のおもて面から深さ方向に延在して、側壁が前記第5半導体領域および前記第2半導体領域と接し、前記第1半導体領域に達し、
前記第1電極は、前記第5半導体領域および前記第2半導体領域に電気的に接続されていることを特徴とする請求項3〜5のいずれか一つに記載の半導体装置。 - 前記第3半導体領域は、第1導電型であり、
前記第3電極は、前記第1電極に電気的に接続されていることを特徴とする請求項3〜5のいずれか一つに記載の半導体装置。 - 前記第3半導体領域と前記第1深さ位置の間に、前記第1半導体領域よりも不純物濃度の高い第1導電型のバッファ領域を備えることを特徴とする請求項2〜7のいずれか一つに記載の半導体装置。
- 半導体基板の裏面から前記半導体基板の深さ方向に水素イオンを注入する第1水素イオン注入工程と、
前記半導体基板を第1温度でアニールして、前記第1水素イオン注入工程による水素イオンの注入の最大水素濃度の位置に生成した結晶欠陥を低減させ、前記第1水素イオン注入工程で形成された結晶欠陥の欠陥密度が最大値となる位置を、前記最大水素濃度の位置よりも、前記半導体基板の裏面側に形成する第1アニール工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記第1水素イオン注入工程の前に、前記半導体基板の深さ方向で前記欠陥密度が最大値となる位置よりも前記半導体基板の裏面側に、前記半導体基板の裏面から水素イオンを注入する第2水素イオン注入工程を行うことを特徴とする請求項9に記載の半導体装置の製造方法。
- 前記第2水素イオン注入工程では、水素イオンの濃度分布のピークの位置が異なるように、水素イオンを複数回注入することを特徴とする請求項10に記載の半導体装置の製造方法。
- 前記第2水素イオン注入工程の後、前記第1水素イオン注入工程の前に、前記第1温度以上の温度でアニールする第2アニール工程を行うことを特徴とする請求項10または11に記載の半導体装置の製造方法。
- 前記第1アニール工程の後、
前記半導体基板をチップ化する工程と、
前記第1温度よりも低い温度で、チップ化された前記半導体基板を回路基板にはんだ付けするはんだ工程と、を行うことを特徴とする請求項9〜12のいずれか一つに記載の半導体装置の製造方法。 - 半導体基板の内部に設けられた第1導電型の第1半導体領域と、前記半導体基板の内部において、前記第1半導体領域よりも前記半導体基板のおもて面側に設けられた第2導電型の第2半導体領域と、前記半導体基板の内部において、前記第1半導体領域よりも前記半導体基板の裏面側に設けられた、前記第1半導体領域よりも不純物濃度の高い第3半導体領域と、前記半導体基板の内部において、前記第2半導体領域よりも前記半導体基板の裏面側で、前記半導体基板のおもて面に平行な方向に、前記第1半導体領域に接して選択的に設けられた、前記第1半導体領域よりも不純物濃度の高い第1導電型の第4半導体領域と、前記半導体基板の裏面と前記第4半導体領域との間に設けられ、前記半導体基板のおもて面側に結晶欠陥密度が最大となる第1深さ位置を有する結晶欠陥領域と、前記第2半導体領域に電気的に接続された第1電極と、前記第3半導体領域に電気的に接続された第2電極と、を備え、前記第4半導体領域は、不純物として水素原子を含み、前記半導体基板のおもて面側で水素濃度が最大となる第2深さ位置を含む領域に配置され、前記結晶欠陥領域の結晶欠陥密度は前記半導体基板中で最大である半導体装置の製造方法であって、
前記第1半導体領域となる前記半導体基板のおもて面側に、前記第2半導体領域を形成する第1工程と、
前記半導体基板のおもて面に、前記第2半導体領域に電気的に接続された前記第1電極を形成する第2工程と、
前記半導体基板の裏面側に前記第3半導体領域を形成する第3工程と、
前記半導体基板の裏面から、前記第2半導体領域よりも前記半導体基板の裏面側で、かつ前記半導体基板のおもて面に平行な方向で前記第2深さ位置に、水素原子をイオン照射する第4工程と、
前記第4工程の後、熱処理により前記水素原子をドナー化して、前記第2深さ位置を含む領域に、前記第1半導体領域に接して、不純物として前記水素原子を含み、前記第1半導体領域よりも不純物濃度の高い第1導電型の前記第4半導体領域を形成する第5工程と、
前記半導体基板の裏面に、前記第3半導体領域に電気的に接続された前記第2電極を形成する第6工程と、
を含み、
前記第4工程では、イオン照射により前記水素原子の通過領域に結晶欠陥を形成し、
前記第5工程では、前記結晶欠陥の密度が最大となる前記第1深さ位置を有する前記結晶欠陥領域を形成することを特徴とする半導体装置の製造方法。 - 前記半導体基板のおもて面から深さ方向に延在して、側壁と前記第2半導体領域とが接し、前記第1半導体領域または前記第4半導体領域に達するトレンチと、
前記トレンチの内部に絶縁膜を介して設けられた第3電極と、
をさらに備え、
前記第1工程において、前記トレンチ、前記絶縁膜および前記第3電極を形成することを特徴とする請求項14に記載の半導体装置の製造方法。 - 前記半導体基板のおもて面に平行な方向に前記トレンチに達する前記第4半導体領域を形成することを特徴とする請求項15に記載の半導体装置の製造方法。
- 前記第2半導体領域に接する前記第4半導体領域を形成することを特徴とする請求項14〜16のいずれか一つに記載の半導体装置の製造方法。
- 前記第2半導体領域の内部に選択的に設けられた第1導電型の第5半導体領域をさらに備え、
前記第3半導体領域は、第2導電型であり、
前記トレンチは、前記半導体基板のおもて面から深さ方向に延在して、側壁が前記第5半導体領域および前記第2半導体領域と接し、前記第1半導体領域に達し、
前記第1電極は、前記第5半導体領域および前記第2半導体領域に電気的に接続され、
前記第1工程において、前記第5半導体領域を形成することを特徴とする請求項15〜17のいずれか一つに記載の半導体装置の製造方法。 - 前記第3半導体領域は、第1導電型であり、
前記第3電極は、前記第1電極に電気的に接続されていることを特徴とする請求項15〜17のいずれか一つに記載の半導体装置の製造方法。 - 前記第3半導体領域と前記第1深さ位置との間に、前記第1半導体領域よりも不純物濃度の高い第1導電型のバッファ領域を形成することを特徴とする請求項14〜17のいずれか一つに記載の半導体装置の製造方法。
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