发明授权
US5866453A Etch process for aligning a capacitor structure and an adjacent contact
corridor
失效
用于对齐电容器结构和相邻触点走廊的蚀刻工艺
- 专利标题: Etch process for aligning a capacitor structure and an adjacent contact corridor
- 专利标题(中): 用于对齐电容器结构和相邻触点走廊的蚀刻工艺
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申请号: US527924申请日: 1995-09-14
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公开(公告)号: US5866453A公开(公告)日: 1999-02-02
- 发明人: Kirk D. Prall , Pierre Fazan , Trung Doan , Tyler Lowrey
- 申请人: Kirk D. Prall , Pierre Fazan , Trung Doan , Tyler Lowrey
- 申请人地址: ID Boise
- 专利权人: Micron Technology, Inc.
- 当前专利权人: Micron Technology, Inc.
- 当前专利权人地址: ID Boise
- 主分类号: H01L21/8242
- IPC分类号: H01L21/8242 ; H01L27/108 ; H01L21/20
摘要:
An etch process for increasing the alignment tolerances between capacitor components and an adjacent contact corridor in Dynamic Random Access Memories. The etch process is implemented in a capacitor structure formed over a semiconductor substrate. The capacitor structure includes a first conductor, a dielectric layer on the first conductor and a second conductor on the dielectric layer. The second conductor has a horizontal region laterally adjacent to and extending away from the first conductor. The etch process comprises the steps of: (a) forming a layer of patterned photoresist over the second conductor, the photoresist being patterned to expose a portion of the horizontal region of the second conductor at a desired location of a contact corridor above a source/drain region in the substrate; (b) using the photoresist as an etch mask, anisotropically etching away the exposed portions of the horizontal region of the second conductor; and (c) using the photoresist again as an etch mask, isotropically etching away substantially all of the remaining portions of the horizontal region of the second conductor and thereby enlarging the area available for locating the contact corridor. Alternatively, the horizontal region of the second conductor is removed using a single isotropic etch.
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