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. 30, 2008
Filed:
Nov. 09, 2006
Holger Ruething, Munich, DE;
Hans-joachim Schulze, Ottobrunn, DE;
Manfred Pfaffenlehner, Munich, DE;
Holger Ruething, Munich, DE;
Hans-Joachim Schulze, Ottobrunn, DE;
Manfred Pfaffenlehner, Munich, DE;
Infineon Technologies AG, Munich, DE;
Abstract
A power IGBT includes a semiconductor body having an emitter zone of a first conduction type and a drift zone of a second conduction type proximate to the emitter zone. The IGBT further includes a cell array, each transistor cell of the array having a source zone, a body zone disposed between the source zone and the drift zone, the body zone and source zone short-circuited, and a gate electrode configured to be insulated with respect to the source zone and the body zone. The cell array has a first cell array section with a first cell density and a second cell array section with a second cell density that is lower than the first cell density. The emitter zone has a lower emitter efficiency in a region corresponding to the second cell array section than in a region corresponding to the first cell array section.