Speaker: Dr Julian Steele
Affiliation: University of Queensland
Abstract
While the optoelectronic properties of metal halide perovskites resemble traditional semiconductors, like III-Vs and Si, their soft and dynamic crystal structure confers an assortment of complex thermally-activated properties. This includes ion (or defect) transport and large polaron formation, local polar fluctuations and complex thermal-phase relations. Underpinning these interesting properties is the tendency of perovskites to exhibit fluctuations in their local crystal structure and strong lattice anharmonicity – deviations from the harmonic approximation for oscillating atoms. At elevated temperatures, a static picture of metal perovskite semiconductors simply breaks down and one must account for microscopic lattice dynamics, i.e., phonons, to understand its macroscopic, bulk physical properties. In this contribution, we aim to connect the atomistic origins of anharmonic lattice dynamics in perovskites with their macroscopic properties, including optoelectronic and thermo-mechanical properties.
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