Proceedings of nanoGe Spring Meeting 2022 (NSM22)
DOI: https://doi.org/10.29363/nanoge.nsm.2022.295
Publication date: 7th February 2022
Excitonic transport in organic semiconductors underpins charge generation in all manner of organic electronic devices[1]. In this presentation I will discuss the role that exciton diffusion length plays in organic photovoltaic devices and introduce a steady-state technique to measure the diffusion length in organic semiconductors through exciton-exciton annihilation (EEA), named pulsed-PLQY. Previously, accurate measurements of exciton diffusion length through EEA required highly specialized time-resolved equipment[2]. I will show that by measuring in steady-state the required equipment specialization, cost, and time can be reduced, while the accuracy is improved.
Specifically, a Kinetic Monte-Carlo hopping model is used to simulate the exciton dynamics in an organic semiconductor. These dynamics are analysed using traditional and steady-state EEA techniques. It is found that pulsed-PLQY is less sensitive to the choice of initial density and has increasing confidence with increasing densities used. These simulations are validated by preforming both steady-state and traditional EEA experiments on organic semiconductors, including technologically relevant non-fullerene acceptors (NFAs). Overall, it is found that NFAs show an increase in diffusion length, driven primarily by an increases in diffusivity, when compared to the benchmark fullerene acceptor [3].
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