The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 20, 1996
Filed:
May. 13, 1994
David J Keller, Boise, ID (US);
Micron Semiconductor, Inc., Boise, ID (US);
Abstract
The present invention teaches a method for etching a tungsten silicide (WSi.sub.x) film overlying a polysilicon film in an enclosed chamber during a semiconductor fabrication process, by the steps of: providing a patterned mask overlying the WSi.sub.x film thereby providing exposed portions of the WSi.sub.x film; presenting an etchant chemistry comprising NF.sub.3 and HeO.sub.2 to the exposed portions of the WSi.sub.x film at a temperature ranging from -20.degree. C. to 100.degree. C., thereby etching away the exposed portions of the WSi.sub.x film and simultaneously etching substantially vertical sidewalls in the WSi.sub.x film, the etching continues into the polysilicon film, thereby forming a WSi.sub.x /polysilicon stack having substantially vertical sidewalls.