SEMICONDUCTOR DEVICE AND MANUFACTURING METHOD OF THE SAME

PROBLEM TO BE SOLVED: To form a super junction structure having a high aspect ratio.SOLUTION: A semiconductor device manufacturing method comprises the steps of: forming an epitaxial layer EPI in a plurality of layers by employing a "trench fill method"; and forming trenches, respectively,...

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Bibliographic Details
Main Authors ABIKO YUYA, IIDA TETSUYA, ICHIMURA AKIO, EGUCHI SOJI
Format Patent
LanguageEnglish
Japanese
Published 23.09.2016
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Summary:PROBLEM TO BE SOLVED: To form a super junction structure having a high aspect ratio.SOLUTION: A semiconductor device manufacturing method comprises the steps of: forming an epitaxial layer EPI in a plurality of layers by employing a "trench fill method"; and forming trenches, respectively, at the stages of forming the plurality of layers. That is, as shown in FIG.3, for example, at the stage of forming the epitaxial layer EPI1, a trench TR1 is formed in the epitaxial layer EPI1, and subsequently, at the stage of forming the epitaxial layer EPI2, a trench TR2 is formed in the epitaxial layer EPI2, and at the stage of forming the epitaxial layer EPI3, a trench TR3 is formed in the epitaxial layer EPI3.SELECTED DRAWING: Figure 3 【課題】高アスペクト比を有するスーパージャンクション構造を形成する。【解決手段】「トレンチフィル法」を採用しながら、エピタキシャル層EPIを複数層に分けて形成し、それぞれの複数層を形成した段階で、それぞれの複数層にトレンチを形成する。すなわち、例えば、図3に示すように、エピタキシャル層EPI1を形成した段階で、このエピタキシャル層EPI1にトレンチTR1を形成し、その後、エピタキシャル層EPI2を形成した段階で、このエピタキシャル層EPI2にトレンチTR2を形成し、エピタキシャル層EPI3を形成した段階で、このエピタキシャル層EPI3にトレンチTR3を形成する。【選択図】図3
Bibliography:Application Number: JP20150048613