• Low cost • Flight proven • Lower specific power • Large degradation for strong radiation The typical performances of c-Si for space use mounted on polyimide film are as follows. (Conditions : After 10 years in a 840 km 80 deg. inclination orbit, Cerium-doped microshee grade Z (CMZ) cover glass, unframed panel.)[Nozette, 1992] From the point of low cost and light weight, a-Si mounted on thin film has high performance The characteristics of a-Si are as follows: • Mass produceable • Lightweight and very compact stowed size • Better operation at high temperature • Very light absorbent • Excellent tolerance to radiation dose • Little degradation with temperature • Degradation of its efficiency by light The typical performances of a-Si cells are as follows: (Conditions : After 10 years in a 840 km 80 deg. inclination orbit, CMZ cover glass, unframed panel.) For the large scale SPS in Geosynchronous Earth Orbit (GEO), like NASA/DOE model, a-Si can reduce total mass and cost. Because radiation degradation of a-Si is lower than that of c-Si, a-Si has a lot of merits in designing a long-term commercial Solar Power Satellite in GEO. GaAs (Gallium Arsenide) The efficiency of individual cells has reached 25.7%(AM1.5) which is near the theoretical value (27%). The efficiency of this cell is higher than that of Si, but the cost is much higher than that of Si.
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