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. 05, 2022
Filed:
Jun. 10, 2019
Applicants:
Sciocs Company Limited, Ibaraki, JP;
Sumitomo Chemical Company, Limited, Tokyo, JP;
Inventor:
Fumimasa Horikiri, Ibaraki, JP;
Assignees:
SCIOCS COMPANY LIMITED, Ibaraki, JP;
SUMITOMO CHEMICAL COMPANY, LIMITED, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C01B 21/06 (2006.01); C30B 29/40 (2006.01); H01L 21/02 (2006.01); G01N 21/95 (2006.01); G01N 21/84 (2006.01); C30B 25/02 (2006.01);
U.S. Cl.
CPC ...
C30B 29/406 (2013.01); C01B 21/0632 (2013.01); G01N 21/95 (2013.01); H01L 21/02389 (2013.01); C01P 2002/82 (2013.01); C01P 2006/40 (2013.01); C30B 25/02 (2013.01); G01N 2021/8477 (2013.01);
Abstract
There is provided a nitride crystal substrate constituted by group-III nitride crystal, containing n-type impurities, with an absorption coefficient α being approximately expressed by equation (1) by a least squares method in a wavelength range of at least 1 μm or more and 3.3 μm or less.α=  (1)(where 1.5×10≤K≤6.0×10, a=3),