Recent Progress of Amorphous-Silicon Solar-Cell Technology in Japan

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Abstract
A review is given of the current state of the art in Japanese domestic activities in amorphous silicon solar-cell R and D. The historical background and the present status of amorphous silicon solar-cell research in Japan are overviewed. Some new approaches and key technologies to improve solar-cell performance with new amorphous materials such as a-SiC:H, µc-Si:H, a-SiGe:H and heterojunction solar cells constructed of these materials are introduced. Progress of the conversion efficiency in various types of amorphous-silicon solar-cells is surveyed and discussed. Recent features of the industrialization of a-Si photovoltaic cells in Japan are also reviewed, and future prospects are indicated.