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:
Jul. 29, 2014
Filed:
Mar. 07, 2013
Panasonic Corporation, Osaka, JP;
Yusuke Kinoshita, Kyoto, JP;
Satoshi Tamura, Osaka, JP;
Yoshiharu Anda, Osaka, JP;
Tetsuzo Ueda, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A semiconductor device includes: a second nitride semiconductor layer formed on a first nitride semiconductor layer, and having a larger band gap than the first nitride semiconductor layer; and an electrode filling a recess formed in the first and second nitride semiconductor layers. The first nitride semiconductor layer has a two-dimensional electron gas layer immediately below the second nitride semiconductor layer. The electrode and the second nitride semiconductor layer are in contact with each other at a first contact interface. The electrode and a portion of the first nitride semiconductor layer corresponding to the two-dimensional electron gas layer are in contact with each other at a second contact interface connected below the first contact interface. The first contact interface is formed such that a width of the recess increases upward. The second contact interface is more steeply inclined than the first contact interface.