The dependence of the generation efficiencyk, the collection efficiencyQ, and the current efficiencyσ = kQof a heterojunction solar cell on the two semiconductor bandgapsEg1andEg2is investigated. It is assumed that the two semiconductors have ideal absorption characteristics. It is shown that a heterojunction solar cell can exhibit a better current efficiency σ than a homojunction solar cell, if the semiconductor with the larger bandgap is situated at the illuminated side of the junction.
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Vos et al. (1977) studied this question.