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. 05, 2019
Filed:
Dec. 03, 2015
Fuji Electric Co., Ltd., Kanagawa, JP;
Toshiaki Sakata, Matsumoto, JP;
Mutsumi Kitamura, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kanagawa, JP;
Abstract
Provided is a semiconductor device having a superjunction structure formed by a first conduction type column and a second conduction type column, including a first region of the superjunction structure in which a PN ratio increases in a direction from a first surface side to a second surface side of the superjunction structure; and a second region of the superjunction structure that contacts the first region and is adjacent to a channel region of the semiconductor device, wherein a PN ratio of the second region is less than the PN ratio at an end of the first region on the second surface side and thickness of the second region is less than thickness of the first region.