JP2021015884A - 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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- JP2021015884A JP2021015884A JP2019129514A JP2019129514A JP2021015884A JP 2021015884 A JP2021015884 A JP 2021015884A JP 2019129514 A JP2019129514 A JP 2019129514A JP 2019129514 A JP2019129514 A JP 2019129514A JP 2021015884 A JP2021015884 A JP 2021015884A
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Abstract
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。
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説明する。図4〜図9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模式的に示す断面図である。
図10は、実施の形態2にかかる炭化珪素半導体装置の構造を示す上面図である。図11は、実施の形態2にかかる炭化珪素半導体装置の構造を示す他の上面図である。図12は、実施の形態2にかかる炭化珪素半導体装置の構造を示す図11のA−A’断面図である。図10のA−A’部分の構造は、図12と同様であるため図示を省略する。
実施の形態2において、活性領域40の製造方法は実施の形態1と同様のため、説明を省略する。また、電流センス部37aの製造方法は実施の形態1と同様のため、説明を省略する。
2、102 n型炭化珪素エピタキシャル層
2a 第1n型炭化珪素エピタキシャル層
2b 第2n型炭化珪素エピタキシャル層
3、103 p型ベース層
3a、103a 高機能領域
4、104 第1p+型ベース領域
4a 下部第1p+型ベース領域
4b 上部第1p+型ベース領域
4d 第1p+型ベース領域の接続領域
5、105 第2p+型ベース領域
6、106 n型高濃度領域
6a 下部n型高濃度領域
6b 上部n型高濃度領域
7、107 n+型ソース領域
8、108 p++型コンタクト領域
9、109 ゲート絶縁膜
10、110 ゲート電極
11、111 層間絶縁膜
12、112 絶縁膜
13、113 ソース電極
14、114 裏面電極
15、115 ソース電極パッド
16、116 めっき膜
17、117 はんだ
18、118 トレンチ
18a 温度センス用トレンチ
19、119 外部端子電極
21、121 第1保護膜
22、122 ゲート電極パッド
23、123 第2保護膜
25、125 第1TiN膜
26、126 第1Ti膜
27、127 第2TiN膜
28、128 第2Ti膜
29、129 Al合金膜
35、135 アノード電極パッド
35a 第1温度センス部
35b 第2温度センス部
35c 第3温度センス部
135a 温度センス部
36、136 カソード電極パッド
37、137 OCパッド
37a、137a 電流センス部
40、140 活性領域
41、141 エッジ終端領域
42 メイン半導体素子
42a メイン有効領域
42b メイン無効領域
50、150 MOSFET
50a MOS構造部
60、160 半導体チップ
81、181 p型ポリシリコン層
82、182 n型ポリシリコン層
84、184 アノード電極
85、185 カソード電極
90 内蔵電流源
Claims (6)
- 第1導電型の半導体基板と、
前記半導体基板のおもて面に設けられた、前記半導体基板より低不純物濃度の第1導電型の第1半導体層と、
前記第1半導体層の、前記半導体基板側に対して反対側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半導体層の、前記半導体基板側に対して反対側の表面層に選択的に設けられた第1導電型の第1半導体領域と、
前記第1半導体領域および前記第2半導体層を貫通し、前記第1半導体層に達するストライプ形状の第1トレンチと、
前記第1トレンチの内部にゲート絶縁膜を介して設けられたゲート電極と、
前記ゲート電極上に設けられた層間絶縁膜と、
前記第2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1電極と、
前記半導体基板の裏面に設けられた第2電極と、
を有するMOS構造部と、
温度センス部と、
を備え、
前記温度センス部は、
前記半導体基板と、
前記第1半導体層と、
前記半導体基板に設けられた第2トレンチと、
前記第2トレンチの内部に絶縁膜を介して設けられた第1導電型の第1ポリシリコン層および第2導電型の第2ポリシリコン層と、
前記第1ポリシリコン層と電気的に接続するカソード電極と、
前記第2ポリシリコン層と電気的に接続するアノード電極と、を有し、
前記温度センス部は、オン時に主電流が流れる領域に複数設けられていることを特徴とする半導体装置。 - 前記温度センス部は、前記MOS構造部の前記第1トレンチがストライプ状に延びる方向に、前記第1トレンチを分断するように複数設けられていることを特徴とする請求項1に記載の半導体装置。
- 前記MOS構造部は、
隣り合う前記第1トレンチの間において、前記第1半導体層と前記第2半導体層との間に、前記第1半導体層および前記第2半導体層に接して設けられた、前記第2半導体層よりも不純物濃度の高い第2導電型の第2半導体領域と、
前記第1半導体層の内部に、前記第1トレンチと深さ方向に対向する位置に設けられた第2導電型の第3半導体領域と、
前記第2半導体領域と前記第3半導体領域とを接続する接続領域と、
を有し、
前記接続領域内に第2温度センス部が設けられていることを特徴とする請求項1または2に記載の半導体装置。 - 前記温度センス部は、
前記カソード電極と電気的に接続するカソード電極パッドを有し、
前記アノード電極は、前記第1電極と電気的に接続し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。 - 前記温度センス部は、
前記カソード電極と電気的に接続するカソード電極パッドと、
前記アノード電極と電気的に接続するアノード電極パッドと、
を有す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。 - MOS構造部と温度センス部とを有する半導体装置の製造方法において、
第1導電型の半導体基板のおもて面に、前記半導体基板より低不純物濃度の第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、前記半導体基板側に対して反対側の表面に第2導電型の第2半導体層を形成する第2工程と、
前記第2半導体層の、前記半導体基板側に対して反対側の表面層に選択的に第1導電型の第1半導体領域を形成する第3工程と、
前記第1半導体領域および前記第2半導体層を貫通し、前記第1半導体層に達するストライプ状の第1トレンチ、および第2トレンチを形成する第4工程と、
前記第1トレンチの内部にゲート絶縁膜を介してゲート電極を形成する第5工程と、
前記第2トレンチの内部に絶縁膜を介して第1導電型の第1ポリシリコン層および第2導電型の第2ポリシリコン層を形成する第6工程と、
前記ゲート電極上に層間絶縁膜を形成する第7工程と、
前記第2半導体層および前記第1半導体領域の表面に第1電極を形成する第8工程と、
前記半導体基板の裏面に第2電極を形成する第9工程と、
前記第1ポリシリコン層と電気的に接続するカソード電極を形成する第10工程と、
前記第2ポリシリコン層と電気的に接続するアノード電極を形成する第11工程と、
を含み、
前記第6工程では、前記第1トレンチがストライプ状に延びる方向に、前記ゲート電極が形成された前記第1トレンチを分断するように前記第1ポリシリコン層および前記第2ポリシリコン層を複数形成することを特徴とする半導体装置の製造方法。
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