Open-circuit voltage of organic photovoltaics: Implications of the generalized Einstein relation for disordered semiconductors

The open-circuit voltage dependence on light intensity and temperature is calculated for organic photovoltaics, taking into account the generalized Einstein relation for disordered semiconductors. The results show that open-circuit voltage losses in bulk-heterojunction organic solar cells are affected from the diffusion enhancement inherent to disordered semiconductors. The model is validated by the fitting to recently published experimental data.

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► Generalized Einstein relation (GER) for disordered semiconductors is analyzed.
► GER was found to affect Voc of disordered organic PV.
► Physical model of Voc, which incorporates GER is presented.
► Voc dependences on light intensity and temperature are simulated.
► Model is validated by the fitting to recently published experimental data.