发明授权
US6015734A Method for improving the yield on dynamic random access memory (DRAM)
with cylindrical capacitor structures
有权
用于提高具有圆柱形电容器结构的动态随机存取存储器(DRAM)的产量的方法
- 专利标题: Method for improving the yield on dynamic random access memory (DRAM) with cylindrical capacitor structures
- 专利标题(中): 用于提高具有圆柱形电容器结构的动态随机存取存储器(DRAM)的产量的方法
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申请号: US148561申请日: 1998-09-04
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公开(公告)号: US6015734A公开(公告)日: 2000-01-18
- 发明人: Kuo Ching Huang , Yu Hua Lee , Cheng-Ming Wu
- 申请人: Kuo Ching Huang , Yu Hua Lee , Cheng-Ming Wu
- 申请人地址: TWX Hsin-Chu
- 专利权人: Taiwan Semiconductor Manufacturing Company, Ltd.
- 当前专利权人: Taiwan Semiconductor Manufacturing Company, Ltd.
- 当前专利权人地址: TWX Hsin-Chu
- 主分类号: H01L21/8242
- IPC分类号: H01L21/8242 ; H01L27/108
摘要:
A new method for forming stacked capacitors for DRAMs having improved yields when the bottom electrode is misaligned to the node contact is achieved. A planar silicon oxide (SiO.sub.2) first insulating layer, a Si.sub.3 N.sub.4 etch-stop layer, and a disposable second insulating layer are deposited. First openings for node contacts are etched in the insulating layers. A polysilicon layer is deposited and etched back to form node contacts in the first openings. The node contacts are recessed in the second insulating layer, but above the etch-stop layer to form node contacts abutting the etch-stop layer. A disposable third SiO.sub.2 layer is deposited. Second openings for bottom electrodes are etched over and to the node contacts. A conformal second polysilicon layer is deposited and chem/mech polished back to form the bottom electrodes in the second openings. The third and second insulating layers are removed by wet etching to the etch-stop layer. When the second openings are misaligned over the node contact openings, the polysilicon plugs abutting the Si.sub.3 N.sub.4 etch-stop layer protect the SiO.sub.2 first insulating layer from being eroded over the devices on the substrate. The capacitors are completed by forming a thin dielectric layer on the bottom electrodes, and forming top electrodes from a patterned third polysilicon layer.
公开/授权文献
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