发明授权
- 专利标题: Method of fabricating node capacitor for DRAM processes
- 专利标题(中): 制造用于DRAM工艺的节点电容器的方法
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申请号: US357236申请日: 1999-07-20
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公开(公告)号: US6150278A公开(公告)日: 2000-11-21
- 发明人: Wayne Tan , Kun-Chi Lin
- 申请人: Wayne Tan , Kun-Chi Lin
- 申请人地址: TWX Hsin-Chu
- 专利权人: United Microelectronics Corp.
- 当前专利权人: United Microelectronics Corp.
- 当前专利权人地址: TWX Hsin-Chu
- 主分类号: H01L21/02
- IPC分类号: H01L21/02 ; H01L21/8242
摘要:
An improved method of fabricating a node capacitor for a dynamic random access memory (DRAM) process is disclosed. The process includes depositing a first interpoly dielectric (IPD1) layer over a substrate, patterning a first photoresist layer on the first interpoly dielectric layer, thereby defining a trench. A trench is etched in the first interpoly dielectric layer using the first photoresist layer as a mask. A first polysilicon layer is deposited on the first interpoly dielectric layer. The first polysilicon layer is etched to expose the first interpoly dielectric layer, then forming a landing pad over the substrate. In order to a polycide layer and a second interpoly dielectric (IPD2) layer are deposited, patterning a second photoresist layer, thereby defining a bit line structure. A bit line structure is formed, then depositing a spacer on the bit line structure. A second polysilicon layer is deposited, patterning a third photoresist layer, thereby defining a bottom electrode. A bottom electrode is formed, then depositing a thin NO (silicon nitride-silicon oxide) dielectric layer on the bottom electrode. An addition step is performed before forming the thin NO dielectric layer on the bottom electrode. In this additional step, a hemispherical grain (HSG) polysilicon layer is formed on the second polysilicon layer. This advantage is used to the hemispherical grain polysilicon layer increasing the area of a node capacitor. A third polysilicon layer is deposited completely covering the thin NO dielectric layer to form a top electrode.
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