Proceedings of International Conference on Perovskite Thin Film Photovoltaics and Perovskite Photonics and Optoelectronics (NIPHO20)
Publication date: 25th November 2019
Current solar energy conversion devices suffer from significant thermalisation losses which inevitably reduce their efficiency. Singlet fission is a powerful strategy to reduce thermalization, hence enhancing single junction solar cell efficiencies. 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 (e.g. conjugated organic molecules) represent great promise for a better use of the high-energy part of the solar spectrum. 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 (i.e. about half the bandgap of the singlet fission material itself).
In this work we show triplet transfer from tetracene to silicon upon exposure to air by measuring magnetic-field-dependent photocurrents and we investigate properties at the tetracene/silicon interface.
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