Invention Grant
- Patent Title: Split gate flash cell semiconductor device
- Patent Title (中): 分离栅闪存单元半导体器件
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Application No.: US14561597Application Date: 2014-12-05
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Publication No.: US09257515B2Publication Date: 2016-02-09
- Inventor: Yimin Wang
- Applicant: WaferTech, LLC
- Applicant Address: US WA Camas
- Assignee: WAFERTECH, LLC
- Current Assignee: WAFERTECH, LLC
- Current Assignee Address: US WA Camas
- Agency: Duane Morris LLP
- Main IPC: H01L29/788
- IPC: H01L29/788 ; H01L29/423 ; H01L21/28 ; H01L27/115 ; H01L27/088

Abstract:
A split gate flash cell device with floating gate transistors is provided. Each floating gate transistor is formed by providing a floating gate transistor substructure including an oxide disposed over a polysilicon gate disposed over a gate oxide disposed on a portion of a common source. Nitride spacers are formed along sidewalls of the floating gate transistor substructure and cover portions of the gate oxide that terminate at the sidewalls. An isotropic oxide etch is performed with the nitride spacers intact. The isotropic etch laterally recedes opposed edges of the oxide inwardly such that a width of the oxide is less than a width of the polysilicon gate. An inter-gate dielectric is formed over the floating gate transistor substructure and control gates are formed over the inter-gate dielectric to form the floating gate transistors.
Public/Granted literature
- US20150084112A1 SPLIT GATE FLASH CELL SEMICONDUCTOR DEVICE Public/Granted day:2015-03-26
Information query
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