发明授权
- 专利标题: Self-aligned contact formation for semiconductor devices
- 专利标题(中): 用于半导体器件的自对准接触形成
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申请号: US915386申请日: 1997-08-20
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公开(公告)号: US6080672A公开(公告)日: 2000-06-27
- 发明人: Werner Juengling , Kirk Prall , Trung T. Doan , Guy T. Blalock , David Dickerson , David S. Becker
- 申请人: Werner Juengling , Kirk Prall , Trung T. Doan , Guy T. Blalock , David Dickerson , David S. Becker
- 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: H01L21/316
- IPC分类号: H01L21/316 ; H01L21/60 ; H01L21/8242 ; H01L21/00
摘要:
In accordance with the present invention, there is provided a method for fabricating a contact on an integrated circuit, such as a DRAM. The method includes the following steps. A gate stack is formed on the integrated circuit. A spacer is formed on sidewalls of the gate stack. An insulating film is formed on the integrated circuit. The insulating film is planarized. Finally, a gate contact opening is formed through the planarized insulating film. In one embodiment, the gate contact opening is formed by removing the insulator, spacer and insulating film by etching. In this embodiment, the insulator, spacer and insulating film are etched at substantially similar rates. As a result, the integrated circuit is tolerant of mask misalignments, and does not over-etch field oxide or create silicon nitride slivers. In another embodiment, the planarizing step is performed with chemical mechanical planarization to form a substantially flat topography on the surface of the integrated circuit. Thus, the present invention does not require lithography equipment with a relatively large field of depth. In yet a third embodiment, the method may comprise additional steps, including forming additional dielectric on the integrated circuit. Then, gate and bitline contact openings are formed through the additional dielectric. Finally, gate and bitline contacts are formed in self-alignment to the gate stacks. This embodiment may be implemented by forming the gate and bitline contact openings with an etch that removes the additional dielectric, but does not substantially remove the spacer. As a result, the bitline contact cannot be inadvertently connected to a gate stack that functions as a wordline. This connection might disable the integrated circuit.
公开/授权文献
- US5223641A Carboxylic acid mixtures and process for producing the same 公开/授权日:1993-06-29
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