Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.286
Publication date: 18th July 2019
In the application of moleculr electronic materials to solar energy conversion or light emission, device performance depends on the competition between interfacial charge transfer processes and charge transport. Carrier dynamics depend strongly on the chemical structure and physical organisation of the molecular components. In this talk we will consider dynamic electronic processes in two types of solar energy conversion system, molecular photovoltaic devices and conjugated polymer photocatalysts. In molecular donor: acceptor solar cells, we use a combination of transient optical spectroscopy, luminescence and device measurements to probe charge separation and recombination dynamics, and to study the dependence of these processes on the energies and other properties of the relevant excited states. We find that the energetic offset, local microsctructure and brightness of the interfacial state all influence charge generation efficiency. In the case of polymer photocatalysts, activity is driven by a photoinduced charge transfer event from a polymer to a hole scavenger. We use a combination of steady-state and time-resolved spectroscopic tools to show that dynamics depend on microstructure both of the polymer – which controls exciton diffusion – and of the local solvent environment – which controls the driving force. We conclude with a comparison of the key factors controlling useful charge generation in the two types of system.
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International Conference on Hybrid and Organic Photovoltaics
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