Invention Grant
- Patent Title: Etching compositions
- Patent Title (中): 蚀刻组合物
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Application No.: US09285773Application Date: 1999-04-05
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Publication No.: US06833084B2Publication Date: 2004-12-21
- Inventor: Garry A. Mercaldi , Donald L. Yates
- Applicant: Garry A. Mercaldi , Donald L. Yates
- Main IPC: C09K1300
- IPC: C09K1300

Abstract:
The present invention provides an etching composition which includes a polyhydric alcohol in combination with two inorganic acids. Preferably the etching composition of the present invention is a mixture of a glycol, nitric acid and hydrofluoric acid, with propylene glycol being preferred. The etching composition of the present invention achieves a selectivity of greater than 70:1, doped material to undoped material. The present invention provides an etching formulation which has increased selectivity of doped polysilicon to undoped polysilicon and provides an efficient integrated circuit fabrication process without requiring time consuming and costly processing modifications to the etching apparatus or production apparatus.
Public/Granted literature
- US20010004553A1 METHOD FOR ETCHING DOPED POLYSILICON WITH HIGH SELECTIVITY TO UNDOPED POLYSILICON Public/Granted day:2001-06-21
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