Temperature-dependence phonon measurements in single crystal FAPbI3 and FAPbBr3
During the past few years, hybrid organic perovskites (HOP) have been intensively studied as promising materials for not only photovoltaics, but optoelectronic applications in general. Currently, lead-halide based HOP of general formulae MPbX3 (X=I, Br, Cl; M=methylammonium (MA=MCH3NH3), or FA=formamidinium (FA = HC(NH2)2) are the most popular studied systems. As part of our project we aim to better study the dynamic and structural properties of hybrid perovskites, i.e. low-frequency phonons and relaxation molecular dynamics. In our most recent experiment on IN12 (26th-31st January 2017), we have measured acoustic phonon branches of the formamidinium-based iodine hybrid perovskite FAPbI3 and sound velocities have been estimated in most directions. This will allow for the comparison of the elastic constants between MAPbI3, MAPbBr3, FAPbBr3 and FAPbI3. However, it has been reported that these perovskite systems undergo a phase transition between 130 and 160K. We then ask for 7 days in total on the cold source triple axis spectrometer IN12 to study how the lattice dynamics of FAPbI3 and FAPbBr3 evolve across lower temperatures, especially at around 150K.
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DA CUNHA FERREIRA Afonso; Bourges; EVEN Jacky; Antoine Létoublon; PAOFAI SERGE and RAYMOND Stephane. (2018). Temperature-dependence phonon measurements in single crystal FAPbI3 and FAPbBr3. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-02-172
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