JP6231377B2 - 半導体装置及び半導体装置の製造方法 - Google Patents
半導体装置及び半導体装置の製造方法 Download PDFInfo
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Description
(半導体装置100の構造)
図1に示すように、本実施例の半導体装置100は、半導体基板10中に、電流が流れる素子領域110と、その素子領域110を取り囲む終端領域120とを有している。本実施例の半導体装置100は、パワーMOSFETである。
次いで、本実施例の半導体装置100の製造方法を説明する。まず、図4に示すように、複数のゲートトレンチ20と、複数の終端トレンチ30とが形成された半導体基板10を準備する。本実施例では、半導体基板10はSiCによって形成されている。なお、図4では、ゲートトレンチ20は1本のみを図示している。図4の時点で、各ゲートトレンチ20の下端部には、フローティング領域26が形成されている。また、各終端トレンチ30の下端部には、フローティング領域36が形成されている。また、半導体基板10には、ドリフト領域12、ボディ領域13、及び、ソース領域11が形成されている。
続いて、図10を参照して、第2実施例の半導体装置200について、第1実施例と異なる点を中心に説明する。本実施例の半導体装置200は、その基本的構成は第1実施例の半導体装置100(図2参照)と共通する。図10では、第1実施例の半導体装置100と共通する要素については同じ符号を用いて示している。
半導体装置200の製造方法も、基本的には第1実施例の製造方法と同様である。ただし、本実施例では、第1の絶縁層32の上面に第2の絶縁層34を堆積させた後に(図6参照)、第2の絶縁層34の上面に第3の絶縁層238を堆積させる工程を実行する。第3の絶縁層238は、第1の絶縁層32及び第2の絶縁層34と同様に、TEOSを原料とするCVDを行うことによって形成される。第3の絶縁層238を形成する際には、第2の絶縁層34を形成する場合よりも低い圧力の下でCVDを実行する。これにより、第2の絶縁層34の上面に、密な絶縁層である第3の絶縁層238を形成することができる。低い圧力の下でのCVDでは絶縁材料の埋め込み性が悪いが、第3の絶縁層238は平坦な表面上に形成されるので、埋め込み性は問題とならない。
12:ドリフト領域
14:ドレイン領域
18:ドレイン電極
20:ゲートトレンチ
22:ゲート絶縁膜
24:ゲート電極
26:フローティング領域
28:隔壁
30:終端トレンチ
31:隔壁
32、32a、32b:第1の絶縁層
34、34a、34b:第2の絶縁層
36:フローティング領域
40:層間絶縁膜
42:コンタクトホール
44:ゲート配線
100:半導体装置
110:素子領域
120:終端領域
200:半導体装置
238:第3の絶縁層
Claims (2)
- 素子領域と、前記素子領域を取り囲む終端領域が形成されている半導体基板を有しており、
前記素子領域は、
前記半導体基板の表面に形成されているゲートトレンチと、
前記ゲートトレンチの内面を覆うゲート絶縁膜と、
前記ゲート絶縁膜の内側に設けられているゲート電極、
を有しており、
前記終端領域は、
前記半導体基板の表面に形成されている終端トレンチと、
前記終端トレンチの内面全体と前記終端領域内の前記半導体基板の上面を覆う第1の絶縁層と、
前記終端トレンチ内の前記第1の絶縁層の表面に配置されているとともに、前記終端トレンチ内に充填され、かつ、前記終端領域内の前記半導体基板の上面に形成された前記第1の絶縁層の上面に形成されている、第2の絶縁層と、
前記第2の絶縁層の上面に形成されている第3の絶縁層と、
前記第3の絶縁層の上方に配置され、前記ゲート電極と電気的に接続されているゲート配線、
を有しており、
前記第1の絶縁層の屈折率は、前記第2の絶縁層の屈折率よりも大きく、かつ、
前記第3の絶縁層の屈折率は、前記第2の絶縁層の屈折率よりも大きい、
半導体装置。 - ゲートトレンチと前記ゲートトレンチを取り囲む終端トレンチを有する半導体基板の前記ゲートトレンチの内部と前記終端トレンチの内部と前記半導体基板の上面に、第1の圧力の下で第1の絶縁層を堆積する工程と、
前記第1の絶縁層が堆積された後に、前記ゲートトレンチの内部と前記終端トレンチの内部と前記半導体基板の上面に堆積された前記第1の絶縁層の上面に、前記第1の圧力より高い第2の圧力の下で、第2の絶縁層を堆積する工程と、
前記第2の絶縁層の上面に前記第2の圧力より低い第3の圧力で第3の絶縁層を堆積する工程と、
前記ゲートトレンチが形成されている範囲内の前記半導体基板の上面の前記第1、第2及び第3の絶縁層と、前記ゲートトレンチ内の前記第1及び前記第2の絶縁層の一部とを除去する工程と、
前記除去が行われた後で、前記半導体基板を熱処理する工程と、
前記熱処理の後で、前記ゲートトレンチの内面を覆うゲート絶縁膜を形成する工程と、
前記ゲート絶縁膜の内側にゲート電極を形成する工程と、
前記第3の絶縁層の上方に、前記ゲート電極と電気的に接続されるようにゲート配線を形成する工程、
を有する半導体装置の製造方法。
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JP2013267788A JP6231377B2 (ja) | 2013-12-25 | 2013-12-25 | 半導体装置及び半導体装置の製造方法 |
US15/105,278 US9941366B2 (en) | 2013-12-25 | 2014-10-14 | Semiconductor device and manufacturing method of semiconductor device |
DE112014005992.7T DE112014005992B4 (de) | 2013-12-25 | 2014-10-14 | Halbleitervorrichtung und Herstellungsverfahren einer Halbleitervorrichtung |
CN201480071043.7A CN105874576B (zh) | 2013-12-25 | 2014-10-14 | 半导体装置及半导体装置的制造方法 |
PCT/JP2014/077320 WO2015098244A1 (ja) | 2013-12-25 | 2014-10-14 | 半導体装置及び半導体装置の製造方法 |
TW103138545A TW201526237A (zh) | 2013-12-25 | 2014-11-06 | 半導體裝置及半導體裝置的製造方法 |
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JP2011216651A (ja) | 2010-03-31 | 2011-10-27 | Renesas Electronics Corp | 半導体装置の製造方法 |
JP5708788B2 (ja) * | 2011-03-16 | 2015-04-30 | 富士電機株式会社 | 半導体装置およびその製造方法 |
US20130087852A1 (en) * | 2011-10-06 | 2013-04-11 | Suku Kim | Edge termination structure for power semiconductor devices |
US9614043B2 (en) * | 2012-02-09 | 2017-04-04 | Vishay-Siliconix | MOSFET termination trench |
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CN105874576A (zh) | 2016-08-17 |
JP2015126027A (ja) | 2015-07-06 |
DE112014005992B4 (de) | 2018-06-14 |
TW201526237A (zh) | 2015-07-01 |
US20160315157A1 (en) | 2016-10-27 |
WO2015098244A1 (ja) | 2015-07-02 |
CN105874576B (zh) | 2019-04-02 |
US9941366B2 (en) | 2018-04-10 |
DE112014005992T5 (de) | 2016-09-08 |
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