SEMICONDUCTOR DEVICE AND SEMICONDUCTOR DEVICE MANUFACTURING METHOD

PROBLEM TO BE SOLVED: To improve properties of a semiconductor device.SOLUTION: In a semiconductor device having a super junction structure where p-type column regions PC1 and n-type column regions NC1 are periodically arranged, each n-type column region NC1 has a vertical part composed of an epitax...

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Main Authors YAMAGUCHI NATSUO, TANIGUCHI DAISUKE, ABIKO YUYA, EGUCHI SOJI, SAITO SHIGEAKI
Format Patent
LanguageEnglish
Japanese
Published 15.03.2018
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Summary:PROBLEM TO BE SOLVED: To improve properties of a semiconductor device.SOLUTION: In a semiconductor device having a super junction structure where p-type column regions PC1 and n-type column regions NC1 are periodically arranged, each n-type column region NC1 has a vertical part composed of an epitaxial layer NE located between trenches DT1 and tapered embedded n-type epitaxial films ENE arranged on lateral faces of the trench DT1; and each p-type column region PC1 is composed of an embedded p-type epitaxial film EPE arranged in the trench DT1. As described above, by providing the tapered embedded n-type epitaxial films n sidewalls of the trench DT1 where the p-type column region PC1 is arranged, the p-type column region PC1 can be formed in an inverted trapezoidal shape thereby to improve a margin for variation in p-type impurity concentration of the p-type column region PC1. Additionally, due to transverse diffusion of an n-type impurity (e.g., As), on-resistance can be reduced.SELECTED DRAWING: Figure 2 【課題】半導体装置の特性を向上させる。【解決手段】p型カラム領域PC1とn型カラム領域NC1とが周期的に配置されたスーパージャンクション構造を有する半導体装置を次のように構成する。n型カラム領域NC1は、溝DT1間に位置するn型のエピタキシャル層NEよりなる垂直部と、溝DT1の側面に配置されたテーパ状の埋め込みn型エピタキシャル膜ENEと、を有し、p型カラム領域PC1は、溝DT1中に配置された埋め込みp型エピタキシャル膜EPEよりなる。このように、p型カラム領域PC1が配置される溝DT1の側壁に、テーパ状の埋め込みn型エピタキシャル膜ENEを設けることにより、p型カラム領域PC1を逆台形状とすることができ、p型カラム領域PC1のp型不純物濃度のバラツキに対するマージンを向上することができる。また、n型不純物(例えば、As)の横方向拡散により、オン抵抗の低減を図ることができる。【選択図】図2
Bibliography:Application Number: JP20160177033