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. 10, 1991
Filed:
Mar. 27, 1989
Applicant:
Inventors:
Assignee:
NEC Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
437132 ; 148D / ; 148D / ; 148D / ; 437 31 ; 437 95 ; 437107 ; 437939 ; 437946 ;
Abstract
A heterostructure bipolar transistor is formed by a process of steps of holding an N-type gallium arsenide body using as an emitter region in a high vacuum of 10.sup.-9 torr to 10.sup.-13 torr at a first temperature of 400.degree. C. to 1,000.degree. C. where arsenic on a surface of the gallium arsenide body drifts away, lowering the first temperature to a second temperature of 300.degree. C. to 400.degree. C. to start a molecular beam epitaxial growth of a germanium, and forming an N-type germanium layer using as a collector region.