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:
Feb. 09, 1999
Filed:
Sep. 04, 1997
Applicant:
Inventors:
Assignee:
Asea Brown Boveri AG, Baden, CH;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
438133 ;
Abstract
A two-stage method is proposed for producing a highly transparent anode emitter (2) in a GTO (1). In a first step, an anode emitter (2) is indiffused whose thickness is greater than 0.5 .mu.m and whose doping concentration is greater than 10.sup.17 cm.sup.-3. In a second step, the emitter efficiency of the anode emitter (2) is subsequently reduced to a desired degree by local carrier life setting.