JP2016122835A - トレンチ電極を備えた半導体デバイス - Google Patents
トレンチ電極を備えた半導体デバイス Download PDFInfo
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- JP2016122835A JP2016122835A JP2015235406A JP2015235406A JP2016122835A JP 2016122835 A JP2016122835 A JP 2016122835A JP 2015235406 A JP2015235406 A JP 2015235406A JP 2015235406 A JP2015235406 A JP 2015235406A JP 2016122835 A JP2016122835 A JP 2016122835A
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Abstract
Description
11 ドリフト領域
111 チャネル領域
112 より高度にドープされた領域
12 ソース領域
13 ボディ領域
14 ドレイン領域
15 チャネル領域
21 ゲート電極
21’ 電極層
22 ゲート誘電体
30 ダイオード領域
31 第1のダイオード領域
32 第2のダイオード領域
33 第3のダイオード領域
41 ソース電極
412 第2の電極層
42 ゲート接続電極
43 ソース電極セクション
51 絶縁層
53 コンタクト開口部
100 半導体ボディ
101 第1の表面
102 第2の表面
110 トレンチ
1101 トレンチの第1の側壁
1102 トレンチの第2の側壁
1103 トレンチの底部
111 ドリフト領域層
112 ソース領域層
113 ボディ領域層
114 ドレイン領域層
115 コンタクトトレンチ
1151 トレンチの第1の側壁
1152 トレンチの第2の側壁
1153 トレンチの底部
201 第1の保護層
210 エッチングマスク
220 スペーサ
221 第1の誘電体層
222 第2の誘電体層
224 犠牲層
300 注入マスク
301 第1の保護層
302 第2の保護層
α 角度
β 注入角度
D ドレイン端子
G ゲート端子
S ソース端子
x0、x0’、x1、x2、x3 位置
Claims (29)
- 半導体ボディ及び前記半導体ボディに集積された少なくとも1つのデバイスセル(101、102)を含む半導体デバイスであって、前記少なくとも1つのデバイスセルが、
ドリフト領域(11)、ソース領域(12)、及び前記ソース領域(12)と前記ドリフト領域(11)との間に配置されたボディ領域(13)と、
ダイオード領域(30)、及び前記ダイオード領域(30)と前記ドリフト領域(11)との間のpn接合と、
第1の側壁(1101)、前記第1の側壁の反対側の第2の側壁(1102)、及び底部(1103)を備えたトレンチであって、前記ボディ領域(13)が、前記第1の側壁(1101)に隣接し、前記ダイオード領域(30)が、前記第2の側壁(1102)に隣接し、且つ前記pn接合が、前記トレンチの前記底部(1103)に隣接するトレンチと、
前記トレンチに配置され、且つゲート誘電体(22)によって、前記ソース領域(12)、前記ボディ領域(13)、前記ダイオード領域(30)及び前記ドリフト領域(11)から誘電的に絶縁されたゲート電極(21)と、
前記半導体ボディ(100)の第1の表面(101)から前記半導体ボディ(100)の中に延びる更なるトレンチと、
前記更なるトレンチにおいて前記ソース領域(12)及び前記ダイオード領域(30)に隣接する、前記更なるトレンチに配置されたソース電極(41)と、
を含み、
前記ダイオード領域(30)が、前記トレンチの前記底部(1103)の下方に配置された下部ダイオード領域を含み、
前記下部ダイオード領域が、前記トレンチの前記底部(1103)から離れて最大ドーピング濃度を含む半導体デバイス。 - 前記更なるトレンチにおける前記ソース電極(41)が、前記少なくとも1つのデバイスセル(101)の前記ボディ領域(13)に隣接する、請求項1に記載の半導体デバイス。
- 前記更なるトレンチが、第1の側壁(1151)、前記第1の側壁の反対側の第2の側壁(1152)、及び底部(1153)を含み、前記ソース領域(12)が、前記第1及び第2の側壁(1151、1152)に隣接し、且つ前記ダイオード領域(30)が、前記更なるトレンチの少なくとも前記第1の側壁(1151)に隣接する、請求項1に記載の半導体デバイス。
- 少なくとも2つのデバイスセルを含み、
前記少なくとも2つのデバイスセル(101、102)の前記ダイオード領域(30)が、前記半導体ボディ(100)の横方向において離れている、請求項1〜3のいずれか一項に記載の半導体デバイス。 - 前記少なくとも2つのデバイスセル(101、102)の前記ダイオード領域(30)間の距離が、
0.5マイクロメートル〜2マイクロメートルと、
前記トレンチの幅の0.25倍〜1.5倍と、
前記トレンチの下方の前記ドリフト領域(11)における前記ダイオード領域(30)の横幅の30%〜60%と、
からなる群から選択される、請求項4に記載の半導体デバイス。 - 前記更なるトレンチにおける前記ソース電極(41)が、前記ドリフト領域(11)に隣接し、
ショットキーコンタクトが、前記ドリフト領域(11)と前記ソース電極(41)との間に形成される、請求項1〜5のいずれか一項に記載の半導体デバイス。 - 前記第1の表面(101)と前記更なるトレンチの前記底部(1153)との間の垂直距離が、前記第1の表面(101)と前記ダイオード領域(30)の下端との間の垂直距離より小さい、請求項6に記載の半導体デバイス。
- 前記トレンチの前記底部(1103)と前記最大ドーピング濃度の位置との間の距離が、200ナノメートル〜1マイクロメートルである、請求項1〜7のいずれか一項に記載の半導体デバイス。
- 前記トレンチの前記底部(1103)と前記最大ドーピング濃度の位置との間の距離が、250ナノメートル〜500ナノメートルである、請求項8に記載の半導体デバイス。
- 前記最大ドーピング濃度が、1E18cm−3〜5E18cm−3である、請求項1〜9のいずれか一項に記載の半導体デバイス。
- 前記ダイオード領域(30)が、前記最大ドーピング濃度の位置と前記トレンチの前記底部(1103)との間の前記ドーピング濃度の極小値を更に含む、請求項1〜10のいずれか一項に記載の半導体デバイス。
- 前記極小ドーピング濃度が、5E17cm−3〜1E18cm−3である、請求項11に記載の半導体デバイス。
- 前記ゲート誘電体(22)が、前記トレンチの前記第1の側壁(1101)における第1の厚さ、及び前記トレンチの前記第2の側壁(1102)における第2の厚さを有し、前記第2の厚さが、前記第1の厚さより大きい、請求項1〜12のいずれか一項に記載の半導体デバイス。
- 前記第2の厚さが、前記第1の厚さの少なくとも1.5倍である、請求項13に記載の半導体デバイス。
- 前記ゲート誘電体(22)が、前記トレンチの前記第1の側壁(1101)における第1の厚さ、及び前記トレンチの前記底部(1103)における第3の厚さを有し、前記第3の厚さが、前記第1の厚さより厚い、請求項1〜14のいずれか一項に記載の半導体デバイス。
- 前記第3の厚さが、前記第1の厚さの少なくとも1.5倍である、請求項13〜15のいずれか一項に記載の半導体デバイス。
- 前記トレンチが、前記第1の側壁(1101)と前記底部(1103)との間の丸い角を含み、
前記丸い角の半径が、前記第1の側壁(1101)における前記ゲート誘電体(22)の厚さの少なくとも2倍である、請求項1〜16のいずれか一項に記載の半導体デバイス。 - 前記ドリフト領域が、前記少なくとも2つのデバイスセルにおける2つの隣接するデバイスセルの前記ダイオード領域(30)間で前記ドーピング濃度の極大値を含む、請求項4〜17のいずれか一項に記載の半導体デバイス。
- 各ダイオード領域(30)が、
前記ドリフト領域(11)と前記pn接合を形成する第1のダイオード領域(31)と、
前記第1のダイオード領域(31)より高度にドープされ、且つ前記ソース電極(41)に接続される第2のダイオード領域(32)と、
を含む、請求項1〜18のいずれか一項に記載の半導体デバイス。 - 前記第2のダイオード領域(32)が、前記トレンチの前記第2の側壁に隣接する、請求項19に記載の半導体デバイス。
- 各ダイオード領域(30)が、前記第2のダイオード領域(32)より高度にドープされた第3のダイオード領域(33)を含み、
前記第3のダイオード領域(33)が、前記トレンチの前記第2の側壁(1102)に隣接する、請求項19又は20に記載の半導体デバイス。 - 前記第3のダイオード領域(33)の前記ドーピング濃度が、5E18cm−3〜5E19cm−3である、請求項21に記載の半導体デバイス。
- 前記少なくとも2つのデバイスセルが隣接し、
一方のデバイスセルの前記ダイオード領域(30)が、他方のデバイスセルの前記ボディ領域(13)に隣接する、請求項1〜22のいずれか一項に記載の半導体デバイス。 - 前記半導体ボディ(100)が、SiC結晶を含み、
前記トレンチの前記第1の側壁が、前記SiC結晶のc軸と整列される、請求項1〜23のいずれか一項に記載の半導体デバイス。 - 前記半導体ボディ(100)の前記第1の表面(101)と前記第1の側壁(1101)との間の角度が、80°〜89°である、請求項24に記載の半導体デバイス。
- 半導体デバイスを製造する方法であって、
ドリフト領域層(111)、前記ドリフト領域層(111)に隣接するボディ領域層(113)、及び前記ボディ領域層(113)に隣接するソース領域層(112)を含む半導体ボディを提供し、並びに前記半導体ボディ(100)の第1の表面(101)を形成することと、
少なくとも1つのダイオード領域(30)を形成することであって、前記ダイオード領域(30)が、前記ソース領域層(112)から、前記ボディ領域層(113)を通って前記ドリフト領域層(111)の中に延びるように形成し、前記ダイオード領域(30)及び前記ドリフト領域層(111)が1つのpn接合を形成する、形成することと、
少なくとも1つのトレンチ(110)が、第1の側壁において前記ボディ領域層(113)に隣接し、第2の側壁において前記ダイオード領域(30)に隣接し、且つ底部(1103)において前記pn接合に隣接するように、前記第1の側壁(1101)、前記第1の側壁(1101)の反対側の前記第2の側壁(1101)、及び前記底部(1103)を有する前記少なくとも1つのトレンチ(110)を形成することと、
ゲート電極(21)、及び前記ゲート電極(21)を前記半導体ボディ(100)から誘電的に絶縁するゲート誘電体(22)を前記少なくとも1つのトレンチに形成することと、
少なくとも1つの更なるトレンチ(115)が、前記ソース領域層(112)及び前記ダイオード領域(30)に隣接するように、前記少なくとも1つの更なるトレンチ(115)を形成することと、
前記更なるトレンチ(115)において前記ソース領域層(112)及び前記ダイオード領域(30)に隣接するソース電極(41)を前記少なくとも1つの更なるトレンチ(115)に形成することと、
を含み、
前記ダイオード領域(30)を形成した後に残る前記ソース領域層(112)のセクションが、ソース領域(12)を形成し、前記少なくとも1つのダイオード領域(30)を形成した後に残る前記ボディ領域層(113)のセクションが、ボディ領域(13)を形成し、前記少なくとも1つのダイオード領域(30)を形成した後に残る前記ドリフト領域層(111)のセクションが、ドリフト領域(11)を形成し、
前記少なくとも1つのダイオード領域(30)の形成が、前記トレンチの前記底部(1103)の下方に下部ダイオード領域を形成することと、前記トレンチの前記底部(1103)から離れて前記下部ダイオード領域の最大ドーピング濃度を形成することとを含む方法。 - 前記少なくとも1つの更なるトレンチ(115)を形成する前に、絶縁層(51)を前記第1の表面(101)上に形成することを更に含む、請求項26に記載の方法。
- 各ゲート電極(22)の上方で前記絶縁層(51)にコンタクト開口部(53)を形成することと、
各コンタクト開口部(53)において前記ゲート電極(22)に電気的に接続されるゲート接続電極(42)を形成することと、
を更に含む、請求項27に記載の方法。 - 前記トレンチ(110)を形成した後で、水素雰囲気において、前記半導体ボディを熱処理にさらすことを更に含む、請求項26〜28のいずれか一項に記載の方法。
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US10177251B2 (en) | 2017-05-22 | 2019-01-08 | Kabushiki Kaisha Toshiba | Semiconductor device, inverter circuit, drive device, vehicle, and elevator |
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US10700192B2 (en) | 2020-06-30 |
US20190157447A1 (en) | 2019-05-23 |
DE102014117780A1 (de) | 2016-06-09 |
JP6633012B2 (ja) | 2020-01-22 |
US20160163852A1 (en) | 2016-06-09 |
DE102014117780B4 (de) | 2018-06-21 |
JP6105032B2 (ja) | 2017-03-29 |
US9837527B2 (en) | 2017-12-05 |
US20180053841A1 (en) | 2018-02-22 |
JP2017152699A (ja) | 2017-08-31 |
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