Invention Grant
- Patent Title: Method for preventing floating gate variation
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Application No.: US14688006Application Date: 2015-04-16
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Publication No.: US09728545B2Publication Date: 2017-08-08
- Inventor: Chang-Ming Wu , Shih-Chang Liu
- Applicant: Taiwan Semiconductor Manufacturing Co., Ltd.
- Applicant Address: TW Hsin-Chu
- Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
- Current Assignee: Taiwan Semiconductor Manufacturing Co., Ltd.
- Current Assignee Address: TW Hsin-Chu
- Agency: Eschweiler & Potashnik, LLC
- Main IPC: H01L29/423
- IPC: H01L29/423 ; H01L21/28 ; H01L27/105 ; H01L29/66 ; H01L29/06 ; H01L27/11521 ; H01L27/11526 ; H01L27/11548 ; H01L27/11519

Abstract:
A method for manufacturing an embedded flash memory device is provided. Memory and logic shallow trench isolation (STI) regions respectively extend into memory and logic regions of a substrate. The memory and logic STI regions have upper surfaces approximately coplanar with an upper surface of a pad layer overlying the substrate. A capping layer is formed overlying the logic region. A first etch is performed into the pad layer to expose memory gaps between the memory STI regions. A floating gate layer is formed filling the memory gaps. A second, dry etch is performed into the floating gate layer to etch the floating gate layer back to below upper surfaces of the capping layer and the memory STI regions. A third etch is performed into the memory STI regions to recess the memory STI regions. A fourth etch is performed into the floating gate layer to form floating gates.
Public/Granted literature
- US20160307911A1 Method for Preventing Floating Gate Variation Public/Granted day:2016-10-20
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