发明名称 |
Method with trench source to increase the coupling of source to floating gate in split gate flash |
摘要 |
A split-gate flash memory cell having improved programming and erasing speed with a tilted trench source, and also a method of forming the same are provided. This is accomplished by forming two floating gates and their respective control gates sharing a common source region. A trench is formed in the source region and the walls are sloped to have a tilt. A source implant is performed at a tilt angle and the trench is lined with a gate oxide layer. Subsequently, a lateral diffusion of the source implant is performed followed by thermal cycling. The lateral enlargement of the diffused source is found to increase the coupling ratio of the split-gate flash memory cell substantially.
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申请公布号 |
US2004018687(A1) |
申请公布日期 |
2004.01.29 |
申请号 |
US20030627013 |
申请日期 |
2003.07.25 |
申请人 |
TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY |
发明人 |
HSIEH CHIA-TA;KUO DI SON;LIN CHRONG-JUN;CHU WEN-TING |
分类号 |
H01L21/8247;H01L27/115;(IPC1-7):H01L21/336 |
主分类号 |
H01L21/8247 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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