Proceedings of MATSUS23 & Sustainable Technology Forum València (STECH23) (MATSUS23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.127
Publication date: 22nd December 2022
Non-fullerene acceptors (NFAs) have attracted a lot of attention within the organic PV community. Several NFAs are available today outperforming fullerene acceptors in bulk heterojunction solar cells and power conversion efficiencies > 18% have been reported for several different donor acceptor systems. In addition, NFA-based solar cells show also very promising device stabilities under standard operation conditions. In this contribution, I will review the status and the potential of non-fullerene acceptors. I will discuss the charge generation and recombination processes and the role of triple states in NFA-based absorbers. Photoluminescence experiments performed at low temperatures and high magnetic fields reveal the efficient generation of triplet states in non-fullerene acceptors like Y6. Different recombination processes in bulk-heterojunctions containing fullerene or non-fullerene acceptors are found. The role to triplet states in NFA-based bulk-heterojunction blends will be discussed. Especially the role of triplet-triplet annihilation and singlet fission processes will be considered in detail.
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