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Portugall, Oliver
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article
Impact of microstructure on the electron-hole interaction in lead halide perovskites
Abstract
Despite the remarkable progress in the performance of devices based onthe lead halide perovskite semiconductor family, there is still a lackof consensus on their fundamental photophysical properties. Here, usingmagneto-optical transmission spectroscopy we elucidate the impact of themicrostructure on the Coulomb interaction between photo-createdelectron–hole pairs in methylammonium lead triiodide (MAPbI<sub>3</sub>) and the triple-cation lead mixed-halide composition, Cs<sub>0.05</sub>(MA<sub>0.17</sub>FA<sub>0.83</sub>)<sub>0.95</sub>Pb(I<sub>0.83</sub>Br<sub>0.17</sub>)<sub>3</sub>(Cs: cesium, MA: methylammonium, FA: formamidinium) by investigatingthin films with a wide range of grain sizes from tens of nanometers tomicrons. At low temperatures, in which thermal fluctuations of theinteractions are frozen and the rotational disorder of the organiccation is negligible, the exciton binding energy and reduced effectivemass of carriers remain effectively unchanged with grain size. Weconclude that the microstructure plays a negligible role in the Coulombinteraction of the photo-created electron–hole pairs, in contrast toprevious reports. This renewed understanding of the relationship betweenthese fundamental electronic properties and the microstructure iscritical for future fundamental studies and improving device design.