Publication date: 15th December 2025
Losses in open circuit voltage (Voc) are among the limitations to overcome in order to improve the performance of organic solar cells. Using temperature dependent measurements of the electroluminescence (EL) and the external quantum efficiency (EQE) we aim to get a better understanding of the different processes that lead to these losses. From the EQE the losses are calculated by determining the photovoltaic bandgap at which the EQE shows its strongest decrease, which allows to account for losses due to the non-ideal absorption onset and nonradiative recombination. The nonradiative recombination losses can also be estimated using the EL quantum efficiency. With the latter it can be determined how accurate the calculation of this loss component is depending on the photon energy range over which the Voc loss was calculated and from which point the contribution of noise does affect the result. We will show EQE and EL spectra of inverted structure PM6-L8BO solar cells and discuss the resulting losses to the open circuit voltage depending on different parameters.
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