SKM 2023 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Hybrid and Perovskite Photovoltaics III
CPP 51.2: Vortrag
Donnerstag, 30. März 2023, 15:15–15:30, GÖR 226
Time-resolved structural changes in hybrid perovskites under illumination — •Ivan Zaluzhnyy1, Linus Pithan1, Alexander Hinderhofer1, Rustam Rysov2, Fabian Paulus3, and Frank Schreiber1 — 1Institute of applied physics, University of Tübingen, Tübingen, Germany — 2Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 3Center for advancing electronics Dresden, Technical University of Dresden, Dresden, Germany
Hybrid perovskites with mixed halides are known to undergo phase segregation when illuminated by visible light. We used coherent X-ray diffraction at synchrotron sources to reveal the structural changes in the series of MAPbBr(3−x)Ix perovskites illuminated with a white and blue light (broad spectrum and λ≈450 nm, respectively). The experimental data allow us to characterize the initial structure of the perovskite films, observe the changes during the illumination, and estimate the time scales over which these changes take place. Moreover, using x-ray photon correlation spectroscopy (XPCS), we can observe the movement of the domain walls and characterize the mobility of the halide ions. The obtained results allow us to better understand the microscopic mechanisms leading to the halide segregation.