Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.284
Publication date: 7th February 2022
The great progress in organic photovoltaics (OPV) over the past few years was achieved largely by the development of non-fullerene acceptors (NFAs) with power conversion efficiencies now approaching 20%. To achieve this result and further enhance device performance, loss mechanisms must be identified and minimized. Especially triplet excitons are known as being detrimental to device performance, since they can form energetically trapped states, responsible for non-radiative losses or even device degradation. Using the complementary spin-sensitive methods of photoluminescence detected magnetic resonance (PLDMR), transient electron paramagnetic resonance (trEPR) and transient absorption (TA) corroborated by quantum-chemical calculations, we reveal exciton pathways and identify energetically trapped triplet excitons in OPV blends employing the polymer donors PBDB-T, PM6 and PM7 together with NFAs Y6 and Y7. Thereby, all blends reveal long-lived triplet excitons on the NFA via non-geminate hole back transfer. Further, we detect additional triplet generation on the NFA via spin-orbit coupling induced intersystem crossing in blends with the best performing halogenated polymers PM6 and PM7. In conclusion, we identify triplet formation in all tested solar cell absorber films, which underlines that there is an untapped potential for improved charge collection efficiency and elimination of device degradation caused by triplet excitons.
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