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. 03, 2026
Filed:
Feb. 22, 2023
Fuji Electric Co., Ltd., Kawasaki, JP;
Yuki Karamoto, Matsumoto, JP;
Kaname Mitsuzuka, Matsumoto, JP;
FUJI ELECTRIC CO., LTD., Kanagawa, JP;
Abstract
Provided is a semiconductor device including: a semiconductor substrate having an upper surface and a lower surface and provided with a drift region of a first conductivity type; and a buffer region provided between the drift region and the lower surface and having a higher doping concentration than the drift region. The buffer region has M doping concentration peaks provided at different positions in a depth direction of the semiconductor substrate, and a charge carrier coefficient α represented by Expression (1) is 2000 or more and 50000 or less in at least one integer i (i is an integer of 1 or more and M−1 or less).