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. 04, 2017
Filed:
Jan. 24, 2014
Nitto Denko Corporation, Ibaraki-shi, Osaka, JP;
Seiki Teraji, Ibaraki, JP;
Hiroto Nishii, Ibaraki, JP;
Taichi Watanabe, Ibaraki, JP;
Yusuke Yamamoto, Ibaraki, JP;
Kazunori Kawamura, Ibaraki, JP;
Takashi Minemoto, Kusatsu, JP;
Jakapan Chantana, Kusatsu, JP;
NITTO DENKO CORPORATION, Osaka, JP;
Abstract
The present invention provides a CIGS film substantially free from oxidation of a front surface thereof and a CIGS solar cell employing the CIGS film and substantially free from reduction and variation in conversion efficiency. The CIGS film, which is used as a light absorbing layer for the CIGS solar cell, includes: a first region having a Ga/(In+Ga) ratio progressively reduced along its thickness toward a predetermined first thickness position from a back surface of the CIGS film; a second region having a Ga/(In+Ga) ratio progressively increased along its thickness toward a predetermined second thickness position from the first region; and a third region provided on the second region and having a Ga/(In+Ga) ratio progressively reduced along its thickness toward the front surface of the CIGS film.