Ube Industries, Inc.

Ken Kawagishi

Hiroaki Yamaguchi

Hiroto Shimokawa

Takeshi Uekido

Takao Miyamoto

Nobu Iizumi

Naoyuki Matsumoto

A CIS solar cell having flexibility and high conversion efficiency may be produced, using, as a substrate, a polyimide film which is prepared from an aromatic tetracarboxylic acid component comprising 3,3',4,4&#x2032;-biphenyltetracarboxylic dianhydride as the main component and an aromatic diamine component comprising p-phenylenediamine as the main component, and has a maximum dimensional change in the temperature-increasing step of from 25&#xb0; C. to 500&#xb0; C. within a range of from +0.6% to +0.9%, excluding +0.6%, based on the dimension at 25&#xb0; C. before heat treatment.

Process for producing a solar cell having an aromatic polyimide film substrate for high photoelectric conversion efficiency

A polyimide-metal laminate comprising a polyimide film and a metal layer for use as an electrode, which is formed on the side (Side B) of the polyimide film which was in contact with a support when producing a self-supporting film in the production of the polyimide film, is used to produce a CIS solar cell.

Polyimide-metal laminate and solar cell

Disclosed is a polyimide film prepared from an aromatic tetracarboxylic acid component and an aromatic diamine component, which has a dimensional change from 25&#xb0; C. to 500&#xb0; C. within a range of from &#x2212;0.3% to +0.6% based on the initial dimension at 25&#xb0; C. The polyimide film may be used as a substrate for a CIS solar cell.

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Ube, Japan

Ken Kawagishi