JP2018206873A - 炭化珪素半導体装置および炭化珪素半導体装置の製造方法 - Google Patents
炭化珪素半導体装置および炭化珪素半導体装置の製造方法 Download PDFInfo
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Abstract
【解決手段】炭化珪素半導体装置は、炭化珪素半導体基板1と、第1半導体層2と、第1半導体領域10と、第2半導体層11と、第2半導体領域12と、第3半導体領域4と、第4半導体領域5と、第1電極8と、ゲート絶縁膜6と、ゲート電極7と、第2電極9と、を備える。主電流が流れる活性領域101のコーナー部に、第2半導体層11より不純物濃度の高い第5半導体領域51が設けられる。
【選択図】図1
Description
本発明にかかる半導体装置は、ワイドバンドギャップ半導体を用いて構成される。実施の形態1においては、ワイドバンドギャップ半導体として例えば炭化珪素(SiC)を用いて作製された炭化珪素半導体装置について、MOSFETを例に説明する。図1は、実施の形態1にかかる炭化珪素半導体装置のコーナー部の構造を示す図4のA−A’断面図である。図2は、実施の形態1にかかる炭化珪素半導体装置のコーナー部の構造を示す図4のB−B’断面図である。図3は、実施の形態1にかかる炭化珪素半導体装置のコーナー部の構造を示す図4のC−C’断面図である。図4は、実施の形態1にかかる炭化珪素半導体装置のコーナー部の構造を示す上面図である。
次に、実施の形態1にかかる炭化珪素半導体装置の製造方法について、例えば1200Vの耐圧クラスのMOSFETを作製する場合を例に説明する。図5〜8は、実施の形態1にかかる炭化珪素半導体装置の製造途中の状態を示す断面図である。図5〜8では、図2に対応する部分の断面のみを記載している。
図9は、実施の形態2にかかる炭化珪素半導体装置のコーナー部の構造を示す図12のA−A’断面図である。図10は、実施の形態2にかかる炭化珪素半導体装置のコーナー部の構造を示す図12のB−B’断面図である。図11は、実施の形態2にかかる炭化珪素半導体装置のコーナー部の構造を示す図12のC−C’断面図である。図12は、実施の形態2にかかる炭化珪素半導体装置のコーナー部の構造を示す上面図である。
次に、実施の形態2にかかる炭化珪素半導体装置の製造方法について説明する。まず、実施の形態1と同様に、n+型炭化珪素基板1を用意し、p+型コンタクト領域5およびp+型領域51を選択的に形成するまでの工程を順に行う(図5、図6参照)。
図13は、実施の形態3にかかる炭化珪素半導体装置のコーナー部の構造を示す図14のA−A’断面図である。図14は、実施の形態3にかかる炭化珪素半導体装置のコーナー部の構造を示す上面図である。
次に、実施の形態3にかかる炭化珪素半導体装置の製造方法について説明する。まず、実施の形態1と同様に、n+型炭化珪素基板1を用意し、n+型ソース領域4を選択的に形成するまでの工程を順に行う(図5参照)。次に、フォトリソグラフィおよびイオン注入によりp型炭化珪素層11のp+型ベース領域10上の部分の表面層に、p+型コンタクト領域5およびp+型領域51を選択的に形成する(図6参照)。
図15は、実施の形態4にかかる炭化珪素半導体装置のコーナー部の構造を示す図16のA−A’断面図である。図16は、実施の形態4にかかる炭化珪素半導体装置のコーナー部の構造を示す上面図である。
次に、実施の形態4にかかる炭化珪素半導体装置の製造方法について説明する。まず、実施の形態1と同様に、n+型炭化珪素基板1を用意し、n+型ソース領域4を選択的に形成するまでの工程を順に行う(図5参照)。次に、フォトリソグラフィおよびイオン注入によりp型炭化珪素層11のp+型ベース領域10上の部分の表面層に、p+型コンタクト領域5とp+型領域51を選択的に形成する(図6参照)。
図17は、実施の形態5にかかる炭化珪素半導体装置のコーナー部の構造を示す図20のA−A’断面図である。図18は、実施の形態5にかかる炭化珪素半導体装置のコーナー部の構造を示す図20のB−B’断面図である。図19は、実施の形態5にかかる炭化珪素半導体装置のコーナー部の構造を示す図20のC−C’断面図である。図20は、実施の形態5にかかる炭化珪素半導体装置のコーナー部の構造を示す上面図である。
次に、実施の形態5にかかる炭化珪素半導体装置の製造方法について説明する。まず、実施の形態1と同様に、n+型炭化珪素基板1を用意し、フィールド酸化膜13を形成するまでの工程を順に行う(図5〜7参照)。次に、フィールド酸化膜13をフォトリソグラフィによって、エッジ終端領域102および活性領域101のコーナー部には残し、活性領域101のコーナー部以外では半導体層を露出させる。その後、実施の形態1と同様に、ゲート絶縁膜6を形成する工程以降の工程を順に行うことで、図17〜20に示す半導体装置が完成する。
2 n-型炭化珪素層
4 n+型ソース領域
5 p+型コンタクト領域
6 ゲート絶縁膜
7 ゲート電極
8 ソース電極
9 ドレイン電極
10 p+型ベース領域
11 p型炭化珪素層
12 n型ウェル領域
13 フィールド酸化膜
14 層間絶縁膜
15 表面保護膜
16 p+型炭化珪素層
31 JTE1領域
32 JTE2領域
51 p+型領域
101 活性領域
102 エッジ終端領域
103 ゲートランナー領域
Claims (6)
- 第1導電型の炭化珪素半導体基板と、
前記炭化珪素半導体基板のおもて面に設けられた、前記炭化珪素半導体基板より不純物濃度の低い第1導電型の第1半導体層と、
前記第1半導体層の表面に選択的に設けられた第2導電型の第1半導体領域と、
前記第1半導体層および前記第1半導体領域の表面に設けられた第2導電型の第2半導体層と、
前記第2半導体層内の前記第1半導体層上に選択的に設けられた第1導電型の第2半導体領域と、
前記第2半導体層内に選択的に設けられた第1導電型の第3半導体領域と、
前記第2半導体層内の前記第3半導体領域の間に設けられた、前記第2半導体層より不純物濃度の高い第2導電型の第4半導体領域と、
前記第3半導体領域および前記第4半導体領域と電気的に接続する第1電極と、
前記第3半導体領域と前記第2半導体領域とに挟まれた前記第2半導体層の表面に設けられたゲート絶縁膜と、
前記ゲート絶縁膜上に設けられたゲート電極と、
前記炭化珪素半導体基板の裏面に設けられた第2電極と、
を備え、
前記第2半導体層の不純物濃度が5×1016/cm3以下であり、
主電流が流れる活性領域のコーナー部に、前記第2半導体層より不純物濃度の高い第2導電型の第5半導体領域を設けることを特徴とする炭化珪素半導体装置。 - 前記第5半導体領域の、前記活性領域の周囲を囲む終端領域側に、前記第5半導体領域と接する、前記第2半導体層より不純物濃度の高い第6半導体領域をさらに備えることを特徴とする請求項1に記載の炭化珪素半導体装置。
- 前記活性領域のコーナー部において、前記第5半導体領域は、前記第4半導体領域と接することを特徴とする請求項1に記載の炭化珪素半導体装置。
- 前記活性領域のコーナー部において、前記ゲート絶縁膜は、前記第4半導体領域の表面に設けられていることを特徴とする請求項1に記載の炭化珪素半導体装置。
- 前記活性領域のコーナー部において、前記ゲート電極は、フィールド酸化膜により前記第2半導体層および前記第5半導体領域と絶縁されていることを特徴とする請求項1に記載の炭化珪素半導体装置。
- 第1導電型の炭化珪素半導体基板のおもて面に、前記炭化珪素半導体基板より不純物濃度の低い第1導電型の第1半導体層を形成する第1工程と、
前記第1半導体層の表面に選択的に第2導電型の第1半導体領域を形成する第2工程と、
前記第1半導体層および前記第1半導体領域の表面に不純物濃度が5×1016/cm3以下の第2導電型の第2半導体層を形成する第3工程と、
前記第2半導体層内の前記第1半導体層上に選択的に第1導電型の第2半導体領域を形成する第4工程と、
前記第2半導体層内に選択的に第1導電型の第3半導体領域を形成する第5工程と、
前記第2半導体層内の前記第3半導体領域の間に、前記第2半導体層より不純物濃度の高い第2導電型の第4半導体領域を形成する第6工程と、
前記第3半導体領域および前記第4半導体領域と電気的に接続する第1電極を形成する第7工程と、
前記第3半導体領域と前記第2半導体領域とに挟まれた前記第2半導体層の表面に絶縁膜を形成する第8工程と、
前記ゲート絶縁膜上にゲート電極を形成する第9工程と、
前記炭化珪素半導体基板の裏面に第2電極を形成する第10工程と、
を含み、
前記第6工程では、主電流が流れる活性領域のコーナー部に、前記第2半導体層より不純物濃度の高い第2導電型の第5半導体領域を形成することを特徴とする炭化珪素半導体装置の製造方法。
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JP2020177955A (ja) * | 2019-04-15 | 2020-10-29 | 富士電機株式会社 | 炭化珪素半導体装置 |
DE112022000136T5 (de) | 2021-05-24 | 2023-06-15 | Fuji Electric Co., Ltd. | Halbleitervorrichtung |
DE112022000969T5 (de) | 2021-10-14 | 2023-11-23 | Fuji Electric Co., Ltd. | Siliziumkarbid-halbleitervorrichtung |
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