the mass production process for space-use cells is used, it is best to apply the fabrication technology for low-cost terrestrial-use cells and to improve on their performance to space cell level. It is expected that the technology of terrestrial-use solar cells will be promoted to the cost level of several hundreds of yen per watt for amorphous Si cell in a production scale of 10 GW per year by 2000. The cost of the SPS cell will be from ¥250 to ¥400 per watt as the terrestrial-use cell adds the necessary performance suitable for space use. Solar cell development for SPS, coupled with development for low-cost terrestrialuse cells, is one target of technical development of mass production for commercial cells. REFERENCES [1] Hongu, T. (1985) Research promises future breakthroughs in solar energy, Business Japan, 30, p. 45. [2] Ovshinsky, Stanford R. & Yang, Jeffrey (1985) A figure of merit evaluation of amorphous silicon alloy solar cells, Proceedings of the 1985 International Conference on Solar and Wind Energy Applications, p. 75. [3] Ushirokawa, A. & Suzuki, A. (1982) Manufacturing experiment of the large area thin film silicon solar cell for SPS in space, Proceedings of The Space Station Symposium, 1, p. 313.
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