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. 05, 2017
Filed:
Sep. 29, 2015
Infineon Technologies Ag, Neubiberg, DE;
Stefan Decker, Munich, DE;
Sven Lanzerstorfer, Feldkirchen, AT;
Thorsten Meyer, Munich, DE;
Robert Zink, Riegersdorf, AT;
Infineon Technologies AG, Neubiberg, DE;
Abstract
A semiconductor device comprises a semiconductor body. The semiconductor body comprises insulated gate field effect transistor cells. At least one of the insulated gate field effect transistor cells comprises a source zone of a first conductivity type, a body zone of a second, complementary conductivity type, a drift zone of the first conductivity type, and a trench gate structure extending into the semiconductor body through the body zone along a vertical direction. The trench gate structure comprises a gate electrode separated from the semiconductor body by a trench dielectric. The trench dielectric comprises a source dielectric part interposed between the gate electrode and the source zone and a gate dielectric part interposed between the gate electrode and the body zone. The ratio of a maximum thickness of the source dielectric part along a lateral direction and the minimum thickness of the gate dielectric part along the lateral direction is at least 1.5.