JP6666224B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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Description
本実施形態の半導体装置は、第1の電極と、第2の電極と、ゲート電極と、少なくとも一部が第1の電極と第2の電極との間に設けられ、少なくとも一部がゲート電極と第2の電極との間に設けられた第1導電型の第1の炭化珪素領域と、第1の電極と第1の炭化珪素領域との間に設けられ、第1の炭化珪素領域よりも第1導電型不純物の不純物濃度が高い第1導電型の第2の炭化珪素領域と、第1の電極と第2の炭化珪素領域との間に設けられた第2導電型の第3の炭化珪素領域と、第1の電極と第3の炭化珪素領域との間に設けられた第1導電型の第4の炭化珪素領域と、ゲート電極と第2の炭化珪素領域との間に設けられ、第4の炭化珪素領域との間に第3の炭化珪素領域が位置する第1導電型の第5の炭化珪素領域と、第1の電極と第2の炭化珪素領域との間に設けられ、第1の電極に接する第1導電型の第6の炭化珪素領域と、ゲート電極と第3の炭化珪素領域との間、及び、ゲート電極と第5の炭化珪素領域との間に設けられたゲート絶縁層と、を備える。
本実施形態の半導体装置は、第1の電極と、第2の電極と、ゲート電極と、少なくとも一部が第1の電極と第2の電極との間に設けられ、少なくとも一部がゲート電極と第2の電極との間に設けられた第1導電型の第1の炭化珪素領域と、第1の電極と第1の炭化珪素領域との間に設けられ、第1の電極に接する第1導電型の第2の炭化珪素領域と、第1の電極と第1の炭化珪素領域との間に設けられ、第1の電極に接する第1導電型の第3の炭化珪素領域と、第1の電極と第1の炭化珪素領域との間に設けられ、第1の電極に接する第1導電型の第4の炭化珪素領域と、第1の電極と第1の炭化珪素領域との間に設けられ、第1の電極に接する第1導電型の第5の炭化珪素領域と、第1の電極と第1の炭化珪素領域との間に設けられ、第2の炭化珪素領域と第4の炭化珪素領域との間に位置し、第3の炭化珪素領域と第5の炭化珪素領域との間に位置する第2導電型の第6の炭化珪素領域と、第1の電極と、第6の炭化珪素領域との間に設けられた第1導電型の第7の炭化珪素領域と、ゲート電極と第1の炭化珪素領域との間、ゲート電極と第6の炭化珪素領域との間に設けられたゲート絶縁層と、を備える。
図11は、第2の実施形態の第1の変形例の模式断面図である。図10に対応する断面を示す。
図12は、第2の実施形態の第2の変形例の模式断面図である。図10に対応する断面を示す。
本実施形態の半導体装置は、六角形を基本とするユニットが繰り返し配置されたレイアウトパターンを備える点で第2の実施形態の半導体装置と異なる。以下、第2の実施形態と重複する内容については省略する場合がある。
本実施形態の半導体装置は、四角形を基本とするユニットが繰り返し配置されたレイアウトパターンを備える点で第2の実施形態の半導体装置と異なる。以下、第2の実施形態と重複する内容については省略する場合がある。
14 ドレイン電極(第2の電極)
16 ゲート絶縁層
18 ゲート電極
24 ドリフト領域(第1の炭化珪素領域)
25 ドリフト領域(第1の炭化珪素領域)
26 低抵抗領域(第2の炭化珪素領域)
28 ボディ領域(第3の炭化珪素領域)
29 ボディ領域(第6の炭化珪素領域)
30 ソース領域(第4の炭化珪素領域)
31 ソース領域(第7の炭化珪素領域)
32 JFET領域(第5の炭化珪素領域)
34 SBDカソード領域(第6の炭化珪素領域)
35a 第1のSBDカソード領域(第2の炭化珪素領域)
35b 第2のSBDカソード領域(第3の炭化珪素領域)
35c 第3のSBDカソード領域(第4の炭化珪素領域)
35d 第4のSBDカソード領域(第5の炭化珪素領域)
36 ボディコンタクト領域(第7の炭化珪素領域)
37 ボディコンタクト領域(第8の炭化珪素領域)
100 MOSFET(半導体装置)
200 MOSFET(半導体装置)
300 MOSFET(半導体装置)
400 MOSFET(半導体装置)
Claims (4)
- 第1の電極と、
第2の電極と、
ゲート電極と、
少なくとも一部が前記第1の電極と前記第2の電極との間に設けられ、少なくとも一部が前記ゲート電極と前記第2の電極との間に設けられた第1導電型の第1の炭化珪素領域と、
前記第1の電極と前記第1の炭化珪素領域との間に設けられ、前記第1の炭化珪素領域よりも第1導電型不純物の不純物濃度が高い第1導電型の第2の炭化珪素領域と、
前記第1の電極と前記第2の炭化珪素領域との間に設けられた第2導電型の第3の炭化珪素領域と、
前記第1の電極と前記第3の炭化珪素領域との間に設けられた第1導電型の第4の炭化珪素領域と、
前記ゲート電極と前記第2の炭化珪素領域との間に設けられ、前記第4の炭化珪素領域との間に前記第3の炭化珪素領域が位置する第1導電型の第5の炭化珪素領域と、
前記第1の電極と前記第2の炭化珪素領域との間に設けられ、前記第1の電極に接する第1導電型の第6の炭化珪素領域と、
前記第6の炭化珪素領域と前記第4の炭化珪素領域との間に設けられ、前記第3の炭化珪素領域よりも第2導電型の不純物濃度が高く、前記第2の炭化珪素領域と離間し、前記第2の炭化珪素領域との間に前記第3の炭化珪素領域が位置する第2導電型の第7の炭化珪素領域と、
前記ゲート電極と前記第3の炭化珪素領域との間、及び、前記ゲート電極と前記第5の炭化珪素領域との間に設けられたゲート絶縁層と、
を備え、
前記第2の炭化珪素領域の第1導電型不純物の不純物濃度が前記第5の炭化珪素領域及び前記第6の炭化珪素領域の第1導電型不純物の不純物濃度よりも高い半導体装置。 - 前記第6の炭化珪素領域の第1導電型不純物の不純物濃度が前記第1の炭化珪素領域の第1導電型不純物の不純物濃度よりも高い請求項1記載の半導体装置。
- 前記第5の炭化珪素領域の第1導電型不純物の不純物濃度が前記第1の炭化珪素領域の第1導電型不純物の不純物濃度よりも高い請求項1又は請求項2記載の半導体装置。
- 前記第6の炭化珪素領域の第1導電型不純物の不純物濃度が前記第5の炭化珪素領域の第1導電型不純物の不純物濃度よりも高い請求項1ないし請求項3いずれか一項記載の半導体装置。
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US12107127B2 (en) | 2021-09-22 | 2024-10-01 | Kabushiki Kaisha Toshiba | Semiconductor device |
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US9887285B1 (en) | 2018-02-06 |
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