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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 7: Perovskites - organized by Eva M. Herzig (University of Bayreuth, Bayreuth)

CPP 7.5: Invited Talk

Tuesday, March 23, 2021, 11:00–11:40, CPPa

Ultrafast spectroscopy of charge and structural dynamics in hybrid perovskites — •Felix Deschler — TU Munich

Metal-halide perovskites have emerged as promising semiconductors for optoelectronics, in which the soft-crystalline material structure leads to unexpected excitation dynamics, and for which the underlying physics remain unexplored. Unusually strong spin-orbit coupling was predicted to introduce Rashba-type state splitting in the electronic band structure of these materials, which is expected to affect recombination dynamics and spin-populations. It remains an open question, how dynamic changes in the material structure and electronic state populations control application-relevant electronic state nature and relaxation.

In my talk I will present how we use advanced optical spectroscopy to study the dynamics of optically-excited electronic state populations and crystal structure in functional hybrid perovskite semiconductors on ultrafast timescales. I will present results on mixed-cation mixed-halide bulk metal-halide perovskites, for which I will discuss how photodoping controls the properties and recombination of electronic states, and how these can enable highly-efficient optoelectronic devices and novel functionality. I will further discuss recent results on tracking the polaronic nature of excitation on ultrafast time-scales with ultrafast time-resolved diffraction experiments, from which we extract charge localization dynamics in real time.