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We investigate the diode ideality factors obtained from the photovoltaic characteristics and compare them with the ones from the conventional current-voltage characteristics. By eliminating the series resistance in the bulk region, the ideality factors from the photovoltaic measurements can give more accurate information on the recombination processes and the defects in the active quantum wells.
In high concentration photovoltaic (HCPV) systems, III-V multijunction solar cells work under high concentration condition at a small size, normally less than 1cm2. In this case, the metal coverage ratio and the current density become larger than those in the case of flat-plate solar cells. Due to the high current density, combined with the sheet resistance of solar cells, most of currents reverse...
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