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:
May. 14, 1985
Filed:
Aug. 25, 1982
Roland Sittig, Umiken, CH;
BBC Brown, Boveri & Company, Limited, Baden, CH;
Abstract
A semiconductor component such as a four layer assymetrical thyristor having four zones of alternately opposite conductivity type, including a P emitter, an N base, a P base and an N emitter, wherein in the N base zone there is provided a stopping layer in a partial region adjacent the P emitter. The stopping layer has a doping concentration which decreases in a direction towards the P emitter zone perpendicular to the four zones. Thus the transport factor for the holes injected by the P emitter is desirably changed by means of lowering the doping concentration of the stopping layer in front of the P emitter, on the side of the anode, of a highly blocking thyristor in the forward direction, while the full effectiveness of the stopping layer remains unchanged. Also a lower blocking current in the blocking condition and/or a lower transmission voltage in the passing condition is attained.