Local dynamics and vibrational states in hybrid H & D methylammonium lead iodide perovskite MA+PbI3-
We aim to fully investigate vibrational and dynamics properties by inelastic (INS) and quasielastic (QENS) incoherent neutron scattering in methyl ammonium lead iodide perovskite. This family of materials shows high performance as sensitizer in photovoltaic cells, when incorporated in a mesoscopic heterojunction with TiO2, and an organic hole transporter. Although this material is known since the 1950’s, only few dynamics studies have been done in the past, without any attempt to probe the time ranges covered by QENS. It turns out that the knowledge of this dynamics is of prime importance to understand in details the electronic properties of this material. This would allow in the future to design new related materials without toxic elements such as lead and with better stability to humidity. In order to try to differentiate precisely the evolution of the dynamics of the methyl ammonium group as a function of the temperature we will do the same study on fully and partially hydrogenated (deuterated) compounds.
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DJURADO David; BOUCHARD Mathilde; DEMADRILLE RENAUD; Bernhard Frick; IVANOV Alexandre; MENDEZ MALAGA Maria; OLLIVIER Jacques; POUGET Stephanie; REISS Peter and ZBIRI Mohamed. (2015). Local dynamics and vibrational states in hybrid H & D methylammonium lead iodide perovskite MA+PbI3-. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-04-140
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