Abstract
Starting from a heterogeneous semiconductor junction, with an ideal diode characteristic, the maximum attainable efficiency η is calculated for the conversion of solar energy into electric energy. It is calculated as a function of the two semiconductor band gaps, E g 1 and E g 2 , and of two material parameters, a 1 and a 2. The present paper shows how a heterojunction solar cell exhibits better utilization of the solar energy than a homojunction solar cell, but also how the low open circuit voltage completely destroys this advantage. It is proved that the only possible benefits of using a heterojunction, are less severe conditions for the parameters a 1 and a 2.
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