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HL: Fachverband Halbleiterphysik
HL 13: Poster I
HL 13.43: Poster
Montag, 18. März 2024, 15:00–18:00, Poster E
Low temperature photoexcitation dynamics in triple cation lead halide perovskites — •Alexander Schauerte1, Isabel Allegro2, Anton Krüger1, Ian Howard2, Uli Lemmer2, and Marina Gerhard1 — 1Department of Physics and Material Sciences Center, Philipps-Universität Marburg, Germany — 2Light Technology Institute, Karlsruhe Institute of Technology, Germany
Hybrid perovskites are a promising class of materials not only for cheap and efficient solar cells, but they also show a huge potential for lasing applications. In both cases, the charge carrier dynamics is of great interest.
Here, we study the recombination dynamics of the triple cation lead halide perovskite Cs0.1(MA0.17FA0.83)0.9Pb(I0.84Br0.16)3 using time-resolved photoluminescence spectroscopy. The combination of spectrally and spatially resolved measurements allows us to explore the relaxation pathways of carriers and their spatial diffusion on the picosecond time scale.
At low temperatures, the diffusion at early times is enhanced compared to higher temperatures, but saturates within a nanosecond. Moreover, the low-temperature spectra reveal a red-shift over time, particularly below approximately 70 K, indicating the population of energetically relaxed and more localized states. We attribute the dispersive dynamics at low temperatures to the absence of dynamic disorder, which mitigates self-trapping effects at early times, but leads to the population of localized emissive tail states at later times, unraveling the underlying static disorder.
Keywords: TRPL; Triple cation lead halide perovskites; Low temperature; Charge carrier diffusion