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. 21, 1990
Filed:
Oct. 31, 1988
Applicant:
Inventors:
Assignee:
Siemens Aktiengesellschaft, Berlin and Munich, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 38 ;
Abstract
Semiconductor structural elements with four regions of alternating conductivity type have a stored charge characteristic which becomes apparent as so-called 'tail' current upon switching off. The tail current can be reduced by means of an anode-side emitter region containing damaged regions generated by laser bombardment which extend through a pn-junction formed between the anode-side emitter region and a central region up into the central region.