Low frequency lattice excitations in hybrid perovskites for photovoltaic
This proposal wish to study the lattice excitations in lead-halide based hybrid organic perovskites. Recently, these compounds of general formula MPbX3 (where M is organic molecule and X an halogne atom) have conducted to a scientific breakthrough in the quest for low-cost solar cells, with record efficiencies up to 20%. We want to adress the questions of the role of low energy excications for understanding of underlying mechanisms related to transport properties. The low energy excitations corresponds to two aspects (certainly coupled): the low energy phonons related PbX3 octahedra and the relaxation dynsmics of the organic molecule. These compounds exhbit a complex sequence of phase transitions which involve the dynamical disorder of the organic cations. High quality single crystals of sufficient mass to measure phonons has been grown at the university of Rennes. We wish to study two systems: MAPbBr3 (MA=methylammonium (MCH3NH3)), and FAPbI3 FA=formamidinium (HC(NH2)2) . We request 10 days on IN12.
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Bourges; DA CUNHA FERREIRA Afonso; ECOLIVET Claude; EVEN Jacky; Antoine Létoublon and RAYMOND Stephane. (2017). Low frequency lattice excitations in hybrid perovskites for photovoltaic. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-169
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