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:
Mar. 26, 1996
Filed:
Nov. 21, 1994
Applicant:
Inventors:
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437225 ; 437228 ; 437195 ; 437192 ; 1566361 ; 148D / ;
Abstract
A method of forming a metal plug, including a step of flattening by polishing the surface of a contact plug which is formed by etching back a metal layer, for example, a deposited layer of Blk-W on a substrate. It also makes it possible to print a wiring metal layer by a lithographic process which has thus far been considered difficult to apply to Blk-W. In the method of the invention, a contact hole 3 is opened in an insulation film layer 2 on a substrate 1, and, after coating an adhesion layer 4, a metal layer 5 is deposited on the entire surface. Thereafter, the surface of the metal layer 5 is flattened by a polishing operation, and etched back to form a metal plug 7.