JP6959407B2 - トレンチコンタクト構造を含む半導体装置及び製造方法 - Google Patents
トレンチコンタクト構造を含む半導体装置及び製造方法 Download PDFInfo
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- JP6959407B2 JP6959407B2 JP2020120424A JP2020120424A JP6959407B2 JP 6959407 B2 JP6959407 B2 JP 6959407B2 JP 2020120424 A JP2020120424 A JP 2020120424A JP 2020120424 A JP2020120424 A JP 2020120424A JP 6959407 B2 JP6959407 B2 JP 6959407B2
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Description
(i)ソース領域、本体領域、電流波及領域、ダイオード領域、及びシールド領域のうちの少なくとも1つを形成するステップは、少なくとも1回のマスク有り又はマスク無しのイオン注入プロセスを含んでいてよい。
(ii)ダイオード領域を形成するステップは、異なるイオン注入エネルギー/イオン注入量を有する2回以上のイオン注入プロセスを含んでいてよい。
(iii)シールド領域を形成するステップは、ダイオード領域との重複を調整するための少なくとも1回の傾きイオン注入プロセスを含んでいてよい。
102 トレンチゲート構造
104 第一の表面
106 炭化ケイ素半導体本体
108 トレンチコンタクト構造
110 本体領域
112 トレンチゲート構造の第一の側壁
114 ダイオード領域
116 トレンチゲート構造の第二の側壁
118 シールド領域
120 トレンチコンタクト構造の底部
122 トレンチゲート構造の底部
124 ダイオード領域の底部
126 トレンチコンタクト構造の第一の側壁
128 トレンチコンタクト構造の第二の側壁
130 ソース領域
142 ゲートトレンチ
144 コンタクトトレンチ
1021 ゲート誘電体
1022 ゲート電極
Claims (15)
- 半導体装置(100)において、
第一の表面(104)から炭化ケイ素半導体本体(106)の中へと縦方向(y)に沿って延びるトレンチゲート構造(102)と、
前記第一の表面(104)から前記炭化ケイ素半導体本体(106)の中へと前記縦方向(y)に沿って延びるトレンチコンタクト構造(108)であって、前記第一の表面(104)において前記トレンチゲート構造(102)に対して横方向の距離をおいて配置されるトレンチコンタクト構造(108)と、
前記トレンチゲート構造(102)の第一の側壁(112)に隣接する第一の導電型のソース領域(130)及び第二の導電型の本体領域(110)と、
前記トレンチゲート構造(102)の、前記第一の側壁(112)とは反対の第二の側壁(116)に隣接する前記第二の導電型のダイオード領域(114)と、
前記トレンチコンタクト構造(108)の底部(120)に隣接する前記第二の導電型のシールド領域(118)であって、前記トレンチゲート構造(102)に対して横方向の距離(ld)をとって配置されるシールド領域(118)と、
を含み、
前記トレンチゲート構造(102)の底部(122)と前記第一の表面(104)との間の第一の縦方向の距離(vd1)は、前記トレンチコンタクト構造(108)の底部と前記第一の表面(104)との間の第二の縦方向の距離(vd2)と等しい、半導体装置(100)。 - 前記トレンチコンタクト構造(108)と前記シールド領域(118)の組合せは前記縦方向(y)に関して対称である、請求項1の半導体装置(100)。
- 前記ダイオード領域(114)と前記シールド領域(118)は融合される、請求項1又は2の何れかの半導体装置(100)。
- 前記シールド領域(118)は前記ダイオード領域(114)に対して縦方向の距離をおいて配置され、第一の導電型の半導体領域は前記シールド領域(118)と前記ダイオード領域(114)との間に配置され、前記トレンチコンタクト構造(108)に直接隣接する、請求項1又は2の何れかの半導体装置(100)。
- 前記本体領域(100)は前記トレンチゲート構造(102)の前記第一及び第二の側壁(112、116)のうちの前記トレンチゲート構造(102)の前記第一の側壁(112)のみに隣接する、請求項1〜4の何れか1項の半導体装置(100)。
- 前記トレンチゲート構造(102)の前記底部(122)と前記第一の表面(104)との間の前記第一の縦方向の距離(vd1)は、前記ダイオード領域(114)の底部(124)と前記第一の表面(104)との間の第三の縦方向の距離(vd3)と等しいか、それより大きい、請求項1〜5の何れか1項の半導体装置(100)。
- 前記ダイオード領域(114)は前記トレンチコンタクト構造(108)の第一の側壁(126)に隣接し、別のダイオード領域(114)が前記トレンチコンタクト構造(108)の第二の側壁(128)に隣接する、請求項1〜6の何れか1項の半導体装置(100)。
- 前記第一の導電型の電流波及領域と、
前記第一の導電型のドリフト領域であって、前記電流波及領域と前記第一の導電型の半導体基板との間及び/又は前記電流波及領域と前記第一の導電型のコンタクト領域との間に配置されるドリフト領域と、
をさらに含み、
前記電流波及領域のドーピング濃度は前記ドリフト領域のドーピング濃度より高い、
請求項1〜7の何れか1項の半導体装置(100)。 - 前記半導体装置(100)は少なくとも2つのトレンチコンタクト構造(108)を含み、前記トレンチゲート構造(102)は前記2つのトレンチコンタクト構造(108)の第一の一方と前記2つのトレンチコンタクト構造(108)の第二の一方との間に横方向(x)に沿って配置される、請求項1〜8の何れか1項の半導体装置(100)。
- 前記トレンチゲート構造(102)と前記2つのトレンチコンタクト構造(108)の前記第一の一方との間の第一の横方向の距離は、前記トレンチゲート構造(102)と前記2つのトレンチコンタクト構造(108)の前記第二の一方との間の第二の横方向の距離より小さい、請求項9の半導体装置(100)。
- 前記本体領域(110)は、前記2つのトレンチコンタクト構造(108)の前記第二の一方に対して横方向の距離をおいて配置される、請求項9又は10の何れかの半導体装置(100)。
- 前記ソース領域(130)は前記2つのトレンチコンタクト構造(108)の前記第二の一方に直接隣接する、請求項9〜11の何れかの半導体装置(100)。
- 半導体装置(100)の製造方法において、
第一の表面(104)から炭化ケイ素半導体本体(106)の中へと縦方向(y)に沿って延びるトレンチゲート構造(102)を形成するステップと、
前記第一の表面(104)から前記炭化ケイ素半導体本体(106)の中へと延びるトレンチコンタクト構造(108)を形成するステップであって、前記トレンチコンタクト構造(108)は前記第一の表面(104)において前記トレンチゲート構造(102)に対して横方向の距離をおいて配置されるようなステップと、
第一の導電型のソース領域(130)と第二の導電型の本体領域(110)を形成するステップであって、どちらも前記トレンチゲート構造(102)の第一の側壁(112)に隣接するようなステップと、
前記トレンチゲート構造の、前記第一の側壁(112)とは反対の第二の側壁(116)に隣接する前記第二の導電型のダイオード領域(114)を形成するステップと、
前記トレンチコンタクト構造(108)の底部に隣接する前記第二の導電型のシールド領域(118)を形成するステップであって、前記シールド領域(118)は前記トレンチゲート構造(102)に対して横方向の距離(ld)をとって配置されるようなステップと、
を含み、
前記トレンチゲート構造(102)を形成するステップは、前記第一の表面(104)から前記炭化ケイ素半導体本体(106)の中へと前記縦方向(y)に沿って延びるゲートトレンチ(142)を形成するステップを含み、
前記トレンチコンタクト構造(108)を形成するステップは、前記第一の表面(104)から前記炭化ケイ素半導体本体(106)の中へと前記縦方向(y)に沿って延びるコンタクトトレンチ(144)を形成するステップを含み、
前記ゲートトレンチ(142)と前記コンタクトトレンチ(144)は同時に形成される、製造方法。 - 前記シールド領域(118)は、前記コンタクトトレンチ(144)の底部を通じた少なくとも1回のドーパントのイオン注入によって、前記トレンチコンタクト構造(108)に自己整列されて形成される、
請求項13の方法。 - 前記トレンチゲート構造(102)を形成するステップは、前記ゲートトレンチ(142)内にゲート誘電体(1021)を形成するステップと、前記ゲートトレンチ(142)内にゲート電極(1022)を形成するステップを含み、
前記トレンチコンタクト構造(108)を形成するステップは、前記コンタクトトレンチ(144)内に導電材料を形成するステップを含み、
前記ゲートトレンチ(142)内の前記ゲート電極(1022)と前記コンタクトトレンチ(144)内の前記導電材料は同時に形成される、
請求項13又は14の何れかの方法。
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