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.

Graphical AbstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► 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.