Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.215
Publication date: 7th February 2022
Many studies have reported that charge transfer (CT) states are important for the function of organic solar cells, impacting both on charge photogeneration and on the recombination pathways limiting device open circuit voltage. Such states can be most readily observed optically as CT state absorption or emission, allowing direct observation of CT state energetics. Indeed measurement of CT state energies has been central to many analyses of organic solar cell function. However recent several studies of high performance, low energy offset organic solar cells employing non-fullerene solar cells have reported that CT state absorption and emission is no longer clearly observable. This raises the question of how to probe CT states in such devices, and indeed whether CT states are important for function of these devices. In my talk, I will address the charge carrier dynamics which underlie the performance of organic solar cells employing non-fullerene acceptors. I will consider the impact of charge transfer states on these dynamics, in particular for low energy offset, high performance devices, and analyses of the function of such devices when CT state absorption and emission is not easily measurable.
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