Anomalous Electron–Phonon Coupling in Cesium-Substituted Methylammonium Lead Iodide Perovskites
Luis Pérez-Fidalgo,
Kai Xu,
Bethan L. Charles
et al.
Abstract:Most metal halide perovskites (MHPs) which under ambient
conditions
crystallize in a tetragonal or cubic phase exhibit a fairly linear
increase of the fundamental gap with increasing temperature, in frank
contrast to other conventional semiconductors. Though valid in general
for MHPs, it has been shown for the archetypal perovskite MAPbI3 (MA stands for methylammonium) that such a behavior is due
to an almost equal footing of the effects of thermal expansion on
the electronic states and the temperature-induced… Show more
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