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:
Aug. 14, 1990
Filed:
Jan. 31, 1990
Applicant:
Inventors:
Arthur E Geissberger, Roanoke, VA (US);
Robert A Sadler, Roanoke, VA (US);
Gregory E Menk, Roanoke, VA (US);
Matthew L Balzan, Roanoke, VA (US);
Assignee:
ITT Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437110 ; 148D / ; 148D / ; 437128 ; 437133 ;
Abstract
A composite buffer layer is formed with a layer of GaAs on a semi-insulating GaAs substrate. Next a short period superlattice is formed followed by another GaAs layer, whereon is formed a first AlGaAs layer having a first mole fraction of Al and a second AlGaAs layer having a second mole fraction of Al higher than the first mole fraction. As intrinsic GaAs channel layer is formed on the second AlGaAs layer.