SKM 2023 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 51: Hybrid and Perovskite Photovoltaics III
CPP 51.7: Talk
Thursday, March 30, 2023, 16:45–17:00, GÖR 226
Interferometric Bulk Access in Pump-Probe Microspectroscopy of MAPbBr3 Crystals — •Tobias Seewald1, Ulrich J. Bahnmüller2, Sebastian Polarz2, and Lukas Schmidt-Mende1 — 1Department of Physics, University of Konstanz, Germany — 2Institute of Inorganic Chemistry, Leibnitz University Hannover, Germany
We present a microspectroscopic study on individual facets of MAPbBr3 crystals synthesized via an aerosol method controlling the exposed lattice planes. Transient reflection and photoluminescence spectra collected from single few µm facets allow to correlate the findings to micromorphology and lattice termination. Internal reflection of the probe pulse is found to form Fabry-Pérot resonances in the sub-band gap spectral region, which sensitively respond to the modified refractive index upon photoexcitation. Comparing one- and two-photon pump absorption, the dynamics of bulk and surface states can be distinguished on ps timescales.