Open-circuit voltage of an illuminated nonideal heterojunction

The possibility of using the model of tunneling-recombination transport for calculating the photovoltage of an illuminated nonideal heterojunction is demonstrated. The technique of photoexcitation with light of varying spectral composition is used, and the difference in the behavior of the dependence of the photovoltage on the illumination is explained. The heterojunction photovoltage is calculated taking into account the predominance of the tunneling-recombination transport mechanism in the barrier region and modification of the shape of the potential barrier during illumination. It is shown that the dependences calculated at various illumination levels agree with those obtained experimentally.