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:
Nov. 25, 2014
Filed:
Jan. 28, 2013
Asahi Glass Company, Limited, Chiyoda-ku, JP;
Yutaka Kuroiwa, Chiyoda-ku, JP;
Yuichi Yamamoto, Chiyoda-ku, JP;
Tomomi Abe, Chiyoda-ku, JP;
Tetsuya Nakashima, Chiyoda-ku, JP;
Yasushi Kawamoto, Chiyoda-ku, JP;
Shigeru Niki, Tsukuba, JP;
Shogo Ishizuka, Tsukuba, JP;
Asahi Glass Company, Limited, Tokyo, JP;
Abstract
A glass substrate for a CIGS solar cell, having high cell efficiency and high glass transition temperature is provided. The glass substrate for a vapor-deposited CIGS film solar cell has a glass transition temperature of at least 580° C. and an average thermal expansion coefficient of from 70×10to 100×10/° C., wherein the ratio of the average total amount of Ca, Sr and Ba within from 10 to 40 nm in depth from the surface of the glass substrate to the total amount of Ca, Sr and Ba at 5,000 nm in depth from the surface of the glass substrate is at most 0.35, and the ratio of the average Na amount within from 10 to 40 nm in depth from the surface of the glass substrate after heat treatment to such average Na amount before the heat treatment is at least 1.5.