发明授权
- 专利标题: Method for fabricating a cylindrical capacitor including implanting impurities into the upper sections of the lower electrode to prevent the formation of hemispherical grain silicon on the upper sections
- 专利标题(中): 一种用于制造圆柱形电容器的方法,包括将杂质注入到下电极的上部,以防止在上部形成半球形晶粒硅
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申请号: US12013509申请日: 2008-01-14
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公开(公告)号: US07741176B2公开(公告)日: 2010-06-22
- 发明人: Tomohiro Uno , Yoshitaka Nakamura
- 申请人: Tomohiro Uno , Yoshitaka Nakamura
- 申请人地址: JP Tokyo
- 专利权人: Elpida Memory, Inc.
- 当前专利权人: Elpida Memory, Inc.
- 当前专利权人地址: JP Tokyo
- 代理机构: Sughrue Mion, PLLC
- 优先权: JP2007-005944 20070115
- 主分类号: H01L21/8242
- IPC分类号: H01L21/8242 ; H01L27/108
摘要:
A method for fabricating a semiconductor device is disclosed. The semiconductor device includes a capacitor and a support insulator. The capacitor includes a cylindrical electrode. The cylindrical electrode comprises upper and lower sections. The lower section has a roughened inner surface and an outer surface supported by the support insulator. The upper section upwardly projects from the support insulator. An initial cylindrical electrode is formed, wherein the initial cylindrical electrode comprises an initial upper section and an initial lower section which correspond to the upper section and the lower section of the cylindrical electrode, respectively. The initial upper section is supported by the support insulator. Specific impurities are implanted into the initial upper section, wherein the specific impurities serve to prevent the initial upper section from being roughened. Then, the initial cylindrical electrode is exposed to a roughening process so that the initial lower section is roughened to be the lower section.
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