Proceedings of Materials for Sustainable Development Conference (MAT-SUS) (NFM22)
DOI: https://doi.org/10.29363/nanoge.nfm.2022.026
Publication date: 11th July 2022
The introduction of Y-series non-fullerene acceptor such as Y6 have helped to push the power conversion efficiency of organic solar cells above 18 % in single and 19 % in multiple junction organic solar cells. While the wide absorption spectrum of state of the art organic blends guarantees high short circuit currents (Jsc), the fill factor (FF) and in particular the open circuit voltage (Voc) lack well behind the Shockley Queisser limit.
Here we present the results of detailed investigations of Y-series NFAs blended with the donor polymer PM6. Regarding free charge recombination, we find that the reoccupation of the highly emissive Y6 singlet exciton causes almost all photon emission from of the solar cell, but that this pathway contributes to less than 1 % of the total recombination current [1]. On the other hand, while the decay of the decay of the CT state entirely dominates charge recombination, its optical properties remain hidden under the strong Y6 singlet exciton absorption and emission. Interestingly, it is only for very low CT state absorption combined with a fairly high CT radiative efficiency that the solar cell benefits from the radiative properties of the singlet excitons. We also find that despite the high structural order of the PM6:YY6 blend, energetic disorder causes a substantial loss in the Voc [2]. Further studies suggest that the same energetic disorder accelerates the CT decay and with this non-geminate recombination, being the main cause for the non-ideal FF. We conclude that major performances losses in such blends are connected to the CT state properties and energetic disorder, both being difficult to disclose by conventional spectroscopic technqiues
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