Proceedings of 13th Conference on Hybrid and Organic Photovoltaics (HOPV21)
Publication date: 11th May 2021
The great progress in OPV over the past few years was achieved by the development of non-fullerene acceptors (NFAs), increasing the power conversion efficiency of organic solar cells up to 18.2%.[1] To further enhance device performance, loss mechanisms have to be identified and minimized. Especially triplet excitons (TE) are detrimental for efficient free charge generation, since they can form energetic trap states, responsible for non-radiative losses or even material degradation. Using spin sensitive measurement techniques, such as optically detected magnetic resonance (ODMR) and transient electron paramagnetic resonance (trEPR), we analyse exciton pathways in NFA-based OSC blends, employing PBDB-T, PM6 and PM7, as donors and Y6 and ITIC, as NFAs. We identify and assign long-living triplet excitons on NFAs, which are generated either via geminate intersystem crossing (ISC) or non-geminate hole back transfer (HBT). In comparison to fullerene-based blends with acceptor PC70BM, trap states on fullerene were partially absent due to higher lying triplet energies, instead TE formed rather on the donor. However, NFA-based solar cells show higher efficiencies due to improved absorption. The good performance suggests that this advantage has higher impact on device efficiency than trapped triplet formation on NFAs and resulting degradation mechanisms. This result is further confirmed by the ternary blend PM6:O-IDTBR:Y6, which possess higher stability than the binary blend PM6:Y6.[2] Formation of long-lived triplets is determined on both NFAs in the ternary blend, supporting the assumption, that triplet excitons are less responsible for degradation in OPV.
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International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
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