发明名称 |
Planarization of a non-conformal device layer in semiconductor fabrication |
摘要 |
A substantially planar surface is produced from a non-conformal device layer formed over a complex topography, which includes narrow features with narrow gaps and wide features and wide gaps. A conformal layer is deposited over the non-conformal layer. The surface is then polished to expose the non-conformal layer over the wide features. An etch selective to the non-conformal layer is then used to substantially remove the non-conformal layer over the wide features. The conformal layer is then removed, exposing the non-conformal layer. The thickness of the non-conformal layer is now more uniform as compared to before. This enables the polish to produce a planar surface with reduced dishing in the wide spaces.
|
申请公布号 |
US5880007(A) |
申请公布日期 |
1999.03.09 |
申请号 |
US19970940650 |
申请日期 |
1997.09.30 |
申请人 |
SIEMENS AKTIENGESELLSCHAFT;INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
VARIAN, KATHRYN H.;TOBBEN, DIRK;SENDELBACH, MATTHEW |
分类号 |
H01L21/302;H01L21/3065;H01L21/3105;H01L21/3205;H01L21/762;H01L21/768;H01L23/522;(IPC1-7):H01L21/76 |
主分类号 |
H01L21/302 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|