发明授权
- 专利标题: Method of forming contact plugs
- 专利标题(中): 形成接触塞的方法
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申请号: US569838申请日: 1995-12-07
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公开(公告)号: US5858865A公开(公告)日: 1999-01-12
- 发明人: Werner Juengling , Kirk Prall , Gordon Haller , David Keller , Tyler Lowrey
- 申请人: Werner Juengling , Kirk Prall , Gordon Haller , David Keller , 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: H01L21/28
- IPC分类号: H01L21/28 ; H01L21/60 ; H01L21/768 ; H01L21/8242 ; H01L23/485 ; H01L21/3205
摘要:
Within an integrated circuit, a contact plug with a height not extending above the level of the gate/wordline nitride is nonetheless provided with a relatively large contact area or landing pad, significantly larger than the source/drain region to which the contact plug is electrically connected. Methods for producing the inventive contact plug include (1) use of a nitride facet etch, either (a) during a nitride spacer formation etch or (b) during a BPSG etch; (2) using at least one of (a) an isotropic photoresist etch or partial descum to narrow BPSG spacers above the gate/wordline nitride, and (b) a nitride step etch to etch the shoulder area of the gate/wordline nitride exposed by a BPSG etch; and (3) polishing a BPSG layer down to the top of a gate/wordline nitride before any doped polysilicon plug fill, masking for BPSG etch and performing a BPSG etch, etching the photoresist layer through a partial descum, and etching the shoulder area of the gate/wordline nitride exposed thereby.
公开/授权文献
- US4020563A Slab gel dryer and method 公开/授权日:1977-05-03
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