Dresden 2026 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 45: Perovskite and Photovoltaics: Spectroscopy
HL 45.8: Talk
Thursday, March 12, 2026, 17:00–17:15, POT/0006
Influence of static disorder on the low temperature photoexcitation dynamics in triple cation lead halide perovskites — •Alexander Schauerte1, Anton Krüger1, Isabel Allegro2, Dominik Muth1, Ian Howard2, Uli Lemmer2, and Marina Gerhard1 — 1Department of Physics and Marburg Centre for Quantum Materials and Sustainable Technologies, Hans-Meerwein-Str. 4, Philipps-Universität Marburg, 35032 Marburg, Germany — 2Light Technology Institute, Karlsruhe Institute of Technology, Kaiserstraße 12, 76131 Karlsruhe, Germany
We study the recombination dynamics of phase stable triple cation lead halide perovskites Cs0.1(MA0.17FA0.83)0.9Pb1−x(I0.84Br0.16)3−2x with intentionally induced deficiencies of Pb over a broad temperature range using time-resolved photoluminescence (PL) spectroscopy. In the temperature range below 70 K, we find pronounced sub-nanosecond PL dynamics which are accompanied by an increase of the carrier diffusivity by more than one order of magnitude. The findings are attributed to the polaronic Mott transition, beyond which polaron radii overlap, leading to efficient transport and bimolecular recombination. Moreover, the observed energy dependent PL dynamics at low temperatures indicate the presence of a phonon bottleneck, which inhibits efficient cooling of the excited population. We find that a higher degree of static disorder slows down bimolecular recombination, while the phonon bottleneck effect is more pronounced, potentially because slower recombination does not effectively reduce the hot carrier population.
Keywords: TRPL; Excitation dynamics; Triple Cation Perovskites