发明授权
US5384277A Method for forming a DRAM trench cell capacitor having a strap connection
失效
用于形成具有带连接的DRAM沟槽电池电容器的方法
- 专利标题: Method for forming a DRAM trench cell capacitor having a strap connection
- 专利标题(中): 用于形成具有带连接的DRAM沟槽电池电容器的方法
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申请号: US169875申请日: 1993-12-17
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公开(公告)号: US5384277A公开(公告)日: 1995-01-24
- 发明人: Louis L. Hsu , Toshio Mii , Joseph F. Shepard , Seiki Ogura
- 申请人: Louis L. Hsu , Toshio Mii , Joseph F. Shepard , Seiki Ogura
- 申请人地址: NY Armonk
- 专利权人: International Business Machines Corporation
- 当前专利权人: International Business Machines Corporation
- 当前专利权人地址: NY Armonk
- 主分类号: H01L21/285
- IPC分类号: H01L21/285 ; H01L27/108 ; H01L21/70 ; H01L27/00
摘要:
A method of forming a MOS DRAM cell having a trench capacitor in which the strap connection to the trench capacitor, the source, drain, and isolation are all raised above the surface of the single crystal silicon includes the steps of forming the trench capacitors, depositing a blanket gate stack including the gate oxide and a set of gate layers, and then depositing isolation members in apertures etched in the gate stack using the gate oxide as an etch stop. The same sidewalls that are used to form an LDD source and drain combine with nitride sidewalls on a gate contact aperture to separate a gate contact from source and drain contacts.
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