Invention Grant
US08389356B2 Flash cell with floating gate transistors formed using spacer technology
有权
使用间隔技术形成浮栅晶体管的闪存单元
- Patent Title: Flash cell with floating gate transistors formed using spacer technology
- Patent Title (中): 使用间隔技术形成浮栅晶体管的闪存单元
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Application No.: US13045449Application Date: 2011-03-10
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Publication No.: US08389356B2Publication Date: 2013-03-05
- Inventor: Yimin Wang
- Applicant: Yimin Wang
- Applicant Address: US WA Camas
- Assignee: Wafertech, LLC
- Current Assignee: Wafertech, LLC
- Current Assignee Address: US WA Camas
- Agency: Duane Morris LLP
- Main IPC: H01L21/336
- IPC: H01L21/336

Abstract:
Methods for forming split gate flash cell structures provide for symmetrical cells that are immune to misalignment of the photoresist pattern when forming the control gates. Spacers are utilized to form the floating gates in the floating gate transistors used in the flash cells. The spacers may be oxide spacers used to mask a polysilicon layer that will form the floating gates or the spacers may be polysilicon spacers that will themselves form the floating gates. The inter-gate oxide of the floating gate transistors may be formed using HTO or may be deposited. Hard mask spacers are used in conjunction with the control gate photoresist patterning operation to control the size and configuration of the control gate and the channel length.
Public/Granted literature
- US20120231594A1 FLASH CELL WITH FLOATING GATE TRANSISTORS FORMED USING SPACER TECHNOLOGY Public/Granted day:2012-09-13
Information query
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