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:
Sep. 24, 2019
Filed:
Jun. 08, 2018
Asahi Kasei Kabushiki Kaisha, Tokyo, JP;
Akira Yoshikawa, Tokyo, JP;
Kazuhiro Nagase, Tokyo, JP;
Motoaki Iwaya, Tokyo, JP;
Saki Ushida, Tokyo, JP;
ASAHI KASEI KABUSHIKI KAISHA, Tokyo, JP;
Abstract
An MSM ultraviolet ray receiving element has a low dark state current value and a good photosensitivity. The MSM ultraviolet ray receiving element has a first nitride semiconductor layer on a substrate, a second nitride semiconductor layer on the first nitride semiconductor layer, and first and second electrodes on the second nitride semiconductor layer. The first nitride semiconductor layer contains AlGaN (0.4≤X≤0.90). The second nitride semiconductor layer contains AlGaN with a film thickness t (nm) satisfying 5≤t≤25. The first electrode and the second electrode contain a material containing at least three elements of Ti, Al, Au, Ni, V, Mo, Hf, Ta, W, Nb, Zn, Ag, Cr, and Zr. Al composition ratios X and Y and a film thickness t satisfy −0.009×t+X+0.22−0.03≤Y≤−0.009×t+X+0.22+0.03.