JP7013606B1 - 半導体装置、及び半導体装置の製造方法 - Google Patents
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- 239000004065 semiconductor Substances 0.000 title claims abstract description 281
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 59
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000012535 impurity Substances 0.000 claims abstract description 55
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 16
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- 230000001590 oxidative effect Effects 0.000 claims description 12
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- 238000005229 chemical vapour deposition Methods 0.000 description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 6
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- 229910052698 phosphorus Inorganic materials 0.000 description 6
- 239000011574 phosphorus Substances 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000009413 insulation Methods 0.000 description 5
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- 238000001020 plasma etching Methods 0.000 description 4
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 4
- 238000001039 wet etching Methods 0.000 description 4
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 229910052796 boron Inorganic materials 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
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- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
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- 238000001312 dry etching Methods 0.000 description 2
- 238000002149 energy-dispersive X-ray emission spectroscopy Methods 0.000 description 2
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- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910052787 antimony Inorganic materials 0.000 description 1
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 description 1
- 229910052785 arsenic Inorganic materials 0.000 description 1
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 1
- 238000000089 atomic force micrograph Methods 0.000 description 1
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- 229910044991 metal oxide Inorganic materials 0.000 description 1
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
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Abstract
Description
(半導体装置100の構造)
第1の実施形態に係る半導体装置100の詳細な構造について、図1、及び図2を参照して説明する。図1(a)は第1の実施形態に係る半導体装置100の断面図、図1(b)は図1(a)の鎖線A部を示す断面図、図1(c)は第1の実施形態に係る半導体装置100の断面図である。図2(a)は第1の実施形態に係る半導体装置100の平面図、図2(b)は図2(a)のC-C’における断面図、図2(c)は図2(a)のD-D’における断面図を示している。
半導体装置100の動作について説明する。
図3~図10は、第1の実施形態に係る半導体装置100の製造工程を表す工程断面図である。図3~図10を参照して、第1の実施形態に係る半導体装置100の製造方法の一例を説明する。
第1の実施形態に係る半導体装置100の効果について、図11に示す比較例に係る半導体装置400を用いて説明する。
第1の実施形態の変形例に係る半導体装置101について、図12を参照して説明する。図12(a)は第1の実施形態の変形例に係る半導体装置101の断面図、図12(b)は図12(a)の鎖線E部を示す断面図である。
第2の実施形態に係る半導体装置200について、図15を参照して説明する。図15(a)は第2の実施形態に係る半導体装置200の断面図、図15(b)は図15(a)の鎖線F部を示す断面図である。
第2の実施形態の変形例に係る半導体装置201について、図19を参照して説明する。図19は、ドットトレンチ型のフィールドプレート構造を有する半導体装置201の平面図を示しており、図15で示したソース電極14は省略されている。また、図19のL-L’における断面図は、図15に示した第2の実施形態に係る半導体装置200の断面図と同様である。
第3の実施形態に係る半導体装置300について、図20を参照して説明する。図20(a)は第3の実施形態に係る半導体装置300の断面図、図20(b)は図20(a)の鎖線M部を示す断面図である。
10 ドレイン電極
13 ゲート電極
14 ソース電極
20 第1半導体領域
21 ドレイン領域(半導体基板)
22 ドリフト領域
23 第2半導体領域
24 ベース領域
25 コンタクト領域
26 ソース領域
30 導電部(フィールドプレート電極)
31 第1導電部
32 第2導電部
33 第3導電部
34 第4導電部
40 絶縁層
41 第1絶縁部
42 第2絶縁部
43 第3絶縁部
44 第4絶縁部
51 ソースコンタクト領域
52 ゲートコンタクト領域
53 ゲートパッド
Claims (10)
- 第1電極と、
第2電極と、
前記第1電極と前記第2電極との間に設けられ、前記第1電極と電気的に接続された第1導電型の第1半導体領域と、
前記第1半導体領域と前記第2電極との間に設けられた第2導電型の複数の第2半導体領域と、
前記第2半導体領域と前記第2電極との間に設けられ、前記第2電極と電気的に接続された第1導電型の第3半導体領域と、
前記第1電極から前記第1半導体領域に向かう第1方向において前記第1電極側に設けられた第1導電部と、
前記第1方向において前記第2電極側に設けられ、前記第1方向と交わる第2方向において前記第2半導体領域間に位置し、前記第1導電部よりも小さい不純物濃度を有する第2導電部と、
を有する導電部と、
前記第1導電部と前記第1半導体領域との間に設けられた第1絶縁部と、
前記第2方向において、前記第2半導体領域と前記第2導電部との間に設けられたゲート電極と、
前記第2導電部と前記ゲート電極との間に設けられた第2絶縁部と、
前記第2半導体領域と前記ゲート電極との間に設けられた第3絶縁部と、
を有する半導体装置。 - 前記第2電極と、前記ゲート電極及び前記第3半導体領域との間に設けられた第4絶縁部をさらに有し、
前記第2電極の一部は、前記第2方向において前記第4絶縁部を介して前記第3半導体領域と隣接する領域にも設けられ、前記第2電極の一部は前記第2導電部と接続されている請求項1に記載の半導体装置。 - 前記第1半導体領域は、素子領域と、前記素子領域を囲む終端領域を有し、
前記素子領域において、前記第2電極と前記第2導電部とが接続されている請求項1に記載の半導体装置。 - 前記第1方向において前記第1電極側の第2導電部の一部は前記第1絶縁部と隣接し、前記第2導電部の一部と前記第1絶縁部との間に設けられた第3導電部をさらに有する請求項1乃至3のいずれか1つに記載の半導体装置。
- 前記第2方向における前記第2導電部と前記第3導電部の幅の和は、前記ゲート電極間における前記第2方向における前記第2導電部の幅よりも大きい請求項4に記載の半導体装置。
- 前記第2導電部の不純物濃度よりも大きい不純物濃度を有する第4導電部をさらに有し、
前記第4導電部は前記第2電極と接続され、
前記第2方向において、前記第2導電部は前記第2絶縁部と前記第4導電部との間に位置している請求項2または3に記載の半導体装置。 - 前記第2導電部は、前記第1絶縁部と隣接する部分を有するように前記第1方向に延在し、
前記第1絶縁部と隣接する前記第2導電部の前記第2方向における幅は、前記第2絶縁部と隣接する前記第2導電部の前記第2方向における幅はよりも大きい請求項6に記載の半導体装置。 - 前記第2絶縁部に含まれる不純物濃度は、前記第1絶縁部または前記第3絶縁部に含まれる不純物濃度よりも大きい請求項1乃至7のいずれか1つに記載の半導体装置。
- 第1方向において、第1導電型の第1半導体領域の表面から前記第1半導体領域中にトレンチを形成する工程と、
前記トレンチの表面に第1絶縁部を形成する工程と、
前記トレンチ内に前記第1絶縁部を介して第1導電部を形成する工程と、
前記第1方向において前記第1絶縁部との間に前記第1導電部が位置するように設けられ、前記第1導電部と接し、且つ前記第1導電部の不純物濃度よりも小さい不純物濃度を有する第2導電部を形成する工程と、
前記第1絶縁部の一部を除去し、前記第1方向と交わる第2方向において前記第2導電部の一部と前記トレンチの内壁の一部を露出する工程と、
前記第2導電部の表面を酸化することで第2絶縁部を形成する工程と、
露出した前記トレンチの前記内壁を酸化することで第3絶縁部を形成する工程と、
前記第2絶縁部と前記第3絶縁部との間にゲート電極を形成する工程と、
前記第2方向において、第1半導体領域中に前記第3絶縁部を介して前記ゲート電極と対向する第2導電型の第2半導体領域を形成する工程と、
前記表面と前記第2半導体領域との間に第1導電型の第3半導体領域を形成する工程と、
を有する半導体装置の製造方法。 - 前記第2導電部はポリシリコンから成り、且つ前記第2絶縁部は前記第2導電部の熱酸化によって形成される請求項9に記載の半導体装置の製造方法。
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JP2014187237A (ja) * | 2013-03-25 | 2014-10-02 | Renesas Electronics Corp | 半導体装置 |
JP2018129358A (ja) * | 2017-02-07 | 2018-08-16 | ルネサスエレクトロニクス株式会社 | 電流検出装置、負荷駆動システム、及び、電流検出装置の製造方法 |
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