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:
Dec. 03, 1991
Filed:
Apr. 01, 1991
Applicant:
Inventors:
Helmut Tews, Unterhaching, DE;
Hans-Peter Zwicknagl, Stuttgart, DE;
Assignee:
Siemens Aktiengesellschaft, Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ; H01L / ; H01L / ;
U.S. Cl.
CPC ...
437 22 ; 437 24 ; 437 33 ; 148D / ; 357 34 ;
Abstract
A method for manufacturing a heterobipolar transistor having and at least greatly diminished extrinsic base-collector capacitance provides an insulation implantation in a sub-collector layer grown onto a semi-insulating substrate via a first mask that covers a region provided for the sub-collector to be constructed or the sub-collector is formed by doping the semi-insulating substrate through a mask. The semiconductor layers for the collector, the base and the emitter, the sub-collector being fashioned in a limited region provided therefore and the emitter is aligned on the sub-collector with a second mask.