Kabushiki Kaisha Toyota Chuo Kenkyusho

Institute of National Colleges of Technology, Japan

Hironori Katagiri

Tomoyoshi Motohiro

Tatsuo Fukano

The sulfide has the following composition, and the photoelectric element uses the sulfide. (1) The sulfide contains Cu, Zn, and Sn as a principal component. (2) When x is a ratio of Cu/(Zn+Sn), y is a ratio of Zn/Sn (x and y being atomic ratios), and the composition of the sulfide is represented by the (x, y) coordinates, with the points A=(0.78, 1.32), B=(0.86, 1.32), C=(0.86, 1.28), D=(0.90, 1.23), E=(0.90, 1.18), and F=(0.78, 1.28), the composition (x, y) of the sulfide is on any one of respective straight lines connecting the points A&#x2192;B&#x2192;C&#x2192;D&#x2192;E&#x2192;F&#x2192;A in that order, or within an area enclosed by the respective straight lines.

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Nagaoka, Japan

Hironori Katagiri