Carrier scattering processes and low energy phonon spectroscopy in hybrid perovskites crystals

Jacky Even (1) , Serge Paofai (2) , Philippe Bourges (3) , Antoine Létoublon (1) , Stéphane Cordier (2) , Olivier Durand (1) , Claudine Katan (2)

1 FOTON - Fonctions Optiques pour les Technologies de l'informatiON
2 ISCR - Institut des Sciences Chimiques de Rennes
3 LLB - UMR 12 - Laboratoire Léon Brillouin

Despite the wealth of research conducted the last three years on hybrid organic perovskites (HOP), several questions remain open including: to what extend the organic moiety changes the properties of the material as compared to all-inorganic (AIP) related perovskite structures. To ultimately reach an answer to this question, we have recently introduced two approaches that were designed to take the stochastic molecular degrees of freedom into account, and suggested that the high temperature cubic phase of HOP and AIP is an appropriate reference phase to rationalize HOP's properties. In this paper, we recall the main concepts and discuss more specifically the various possible couplings between charge carriers and low energy excitations such as acoustic and optical phonons. As available experimental or simulated data on low energy excitations are limited, we also present preliminary neutron scattering and ultrasonic measurements obtained and freshly prepared single crystals of CH3NH3PbBr3 .

Keywords: hybrid perovskite; electron-phonon interaction; transport; neutron scattering; ultrasonic measurements

Domains: Chemical Sciences; Theoretical and/or physical chemistry

Jacky Even, Serge Paofai, Philippe Bourges, Antoine Létoublon, Stéphane Cordier, et al.. Carrier scattering processes and low energy phonon spectroscopy in hybrid perovskites crystals. Proceedings of SPIE, the International Society for Optical Engineering, 2016, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices V, 9743, pp.97430M. ⟨10.1117/12.2213623⟩. ⟨hal-01291680⟩