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:
Apr. 27, 2010
Filed:
Jul. 29, 2005
Applicants:
Hideo Yamamoto, Kanagawa, JP;
Kenya Kobayashi, Kanagawa, JP;
Inventors:
Hideo Yamamoto, Kanagawa, JP;
Kenya Kobayashi, Kanagawa, JP;
Assignee:
NEC Electronics Corporation, Nakahara-ku, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01L 27/088 (2006.01);
U.S. Cl.
CPC ...
Abstract
A MOSFET has a base layer and a source layer in a cell surrounded by a trench gate formed in a semiconductor substrate. A trench contact is formed through the source layer and the base layer. The gate is polygonal such as square. The trench contact is thin and linear so as to increase embedding characteristics. Further, the trench contact is ring or cross shaped so as to reduce a source length.