发明授权
- 专利标题: Method of manufacturing a ferroelectric capacitor having iridium oxide lower electrode
- 专利标题(中): 制造具有氧化铱下电极的铁电电容器的方法
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申请号: US10461858申请日: 2003-06-11
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公开(公告)号: US06998323B2公开(公告)日: 2006-02-14
- 发明人: Takashi Nakamura
- 申请人: Takashi Nakamura
- 申请人地址: JP Kyoto
- 专利权人: Rohm Co., Ltd.
- 当前专利权人: Rohm Co., Ltd.
- 当前专利权人地址: JP Kyoto
- 代理机构: Hamre, Schumann, Mueller & Larson P.C.
- 优先权: JP6-2243 19940113; JP6-2245 19940113; JP6-2246 19940113; JP6-2247 19940113
- 主分类号: H01L21/8242
- IPC分类号: H01L21/8242
摘要:
It is an object of the present invention to provide a ferroelectric capacitor which maintains high ferroelecticity. A silicon oxide layer 2, a lower electrode 12, a ferroelectric layer 8 and an upper electrode 10 are formed on a silicon substrate 2. The lower electrode 12 is formed by an alloy layer made of iridium and platinum. The alloy layer of the lower electrode 12 can be formed under appropriate lattice constant correspond with a kind and composition of the ferroelectric layer 8. So that, a ferroelectric layer having excellent ferroelectricity can be obtained. Also, it is possible to prevent vacancy of oxygen in the ferroelectric layer 8.
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