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:
Jun. 18, 1991
Filed:
Jan. 22, 1990
Applicant:
Inventor:
Yasukazu Seki, Kanagawa, JP;
Assignee:
Fuji Electric Co., Ltd., Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L / ;
U.S. Cl.
CPC ...
357 234 ; 357 38 ; 357 39 ; 357 63 ;
Abstract
A conductivity modulation MOSFET having a second buffer layer is disclosed. The second buffer layer is thinner and has a higher impurity concentration than the first buffer layer. The second buffer layer is interspersed with heavy metal atoms such as gold and platinum that facilitate recombination of holes and electrons thereby shortening turn off time. However, because of the relative thinness of the second layer compared to the first layer, the second layer has almost no influence in increasing ON resistance.