Matsushita Electric Industrial Co., Ltd.

Noriyuki Ueno

Mikio Murozono

Kuniyoshi Omura

Toshiya Kuwamura

Naoki Suyama

Hazime Takada

Yuutaro Kita

Battery

A polycrystalline CuInSe.sub.2 film is produced by adding a liquid cooling medium to a mixture of Cu, In and Se powders, grinding the resulting composition by means of a ball-mill to provide a slurry containing CuInSe.sub.2 of low crystallinity, drying and adding a binding agent to the slurry to form a paste, coating a substrate with the paste, and sintering the paste so applied under a nitrogen atmosphere. The starting materials that can be used are not limited to respective powders of the above-mentioned elements but may be Cu-Se and In-Se compounds and the method provides CuInSe.sub.2 of excellent quality on a mass production scale at low cost.

Method for production of copper indium diselenide

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Nara, Japan

Noriyuki Ueno