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:
Sep. 06, 1983
Filed:
Jan. 26, 1982
Wolfgang M Feist, Burlington, MA (US);
Raytheon Company, Lexington, MA (US);
Abstract
A semiconductor structure wherein a masking layer is formed to cover a portion of a surface of a semiconductor. A first doped region is formed in a portion of the semiconductor exposed by the masking layer. A chemical etchant is brought into contact with the masking layer, reducing the area of the masking layer covering the semiconductor exposing a second, different portion of the semiconductor contiguous to the first exposed portion of the semicoductor. Particles capable of establishing a doped region in the semiconductor layer are introduced into the second, different exposed portion of the semiconductor to form a second doped region in the semiconductor contiguous to the first doped region, such chemically etched masking layer inhibiting such particles from becoming introduced into the portion of the semiconductor disposed beneath the chemically etched masking layer. With such methods a self-aligned gate region may be formed in a field effect device having small channel lengths.