Proceedings of nanoGe Fall Meeting19 (NFM19)
DOI: https://doi.org/10.29363/nanoge.nfm.2019.147
Publication date: 18th July 2019
Current photovoltaic devices feature significant thermalisation losses reducing their efficiency. Within this context, singlet fission represents a powerful strategy to make a better use of the high-energy part of the solar spectrum, hence enhancing single junction solar cell performance. More in details, singlet fission is a carrier multiplication process in organic semiconductors where one photo-excited singlet exciton state is converted into two spin-triplet excitons, each carrying about half the energy of the originally excited singlet state. As two carriers are produced for each photon absorbed, photovoltaic devices based on singlet fission materials – typically, conjugated organic molecules - represent a great promise for a consistent increase of the efficiency of solar cells.
In parallel, metal-halide perovskites have recently attracted wide attention as the absorber material for solar cells.
Our work is aimed at investigating electron transfer dynamics between singlet fission materials (e.g. tetracene, pentacene, rubrene) and suitable perovskites. For efficient singlet fission solar devices, the bandgap of the absorbing perovskite material needs to be well-matched with the triplet state energy of the conjugated organic molecule - around half the bandgap of the singlet fission material itself. For these reasons, low bandgap perovskites are employed in our investigation. We study photoluminescence and exciton dynamics to investigate the charge and energy transfer across the organic/perovskite interface. Computational methods based on first-principles charge and excited state dynamics across the heterojunction are also employed to provide insights for the development of high-performance hybrid solar devices.
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