Invention Grant
- Patent Title: Trench forming method
- Patent Title (中): 沟槽成型方法
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Application No.: US12656911Application Date: 2010-02-19
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Publication No.: US08093152B2Publication Date: 2012-01-10
- Inventor: Sadaharu Tamaki
- Applicant: Sadaharu Tamaki
- Applicant Address: JP
- Assignee: Lapis Semiconductor Co., Ltd.
- Current Assignee: Lapis Semiconductor Co., Ltd.
- Current Assignee Address: JP
- Agency: Rabin & Berdo, PC
- Priority: JP2009-037807 20090220
- Main IPC: H01L21/311
- IPC: H01L21/311

Abstract:
A trench forming method for forming trenches without creating gouges at the boundary between a masking oxide film and a semiconductor layer and at the boundary between an oxide film insulating layer and the semiconductor layer, includes at least three etching steps each using, as the etching gas, one of at least two types of etching gases that respectively contain different components.
Public/Granted literature
- US20100216311A1 Trench forming method Public/Granted day:2010-08-26
Information query
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