Abstract
It is shown that the nature of radiation-induced point defects and dopant interactions can cause a shift in the optimum base doping concentration for terrestrial and space solar cells. The base doping concentration has been optimized for high-efficiency Si, GaAs, and InP solar cells before and after electron irradiation. A combination of detailed carrier lifetime calculations and cell modeling is used to show that the optimum doping concentration for irradiated cells increases for InP cells, decreases for Si cells, and remains essentially unchanged for GaAs cells compared to their counterpart terrestrial cells. The optimum base doping for Si cells decreases from 8.94*10/sup 16/ cm/sup -3/ to approximately 6.6*10/sup 14/ cm/sup -1/ after 1-MeV electron irradiation. In the case of GaAs, the optimum base doping concentration remains at approximately 2*10/sup 17/ cm/sup -3/ for both irradiated and unirradiated cells. The InP base doping needs to be increased in the range of (2-6)*10/sup 17/ cm/sup -3/ from 2*10/sup 17/ cm/sup -3/ for radiation fluences in the range of 10/sup 15/ to 10/sup 16/ cm/sup -2/. >
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