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Berlin 2024 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 32: Spin Phenomena in Semiconductors

HL 32.3: Vortrag

Mittwoch, 20. März 2024, 15:30–15:45, EW 015

Extended Spin Lifetimes in Transition Metal Doped Hybrid Lead Halide Perovskites — •Jonathan Zerhoch1,2,3, Stanislav Bodnar1, Jamie Lerpiniere4, Shangpu Liu1,2,3, Timo Neumann2,3,5, Barbara Sergl2,3, Markus W. Heindl1,2,3, Andrii Shcherbakov1,2,3, Ahmed Elghandour6, Rüdiger Klingeler6, Alison Walker4, and Felix Deschler11Physikalisch-Chemisches Institut, Universität Heidelberg — 2Walter Schottky Institut, Technische Universität München — 3Physics Department, TUM School of Natural Sciences, Technische Universität München — 4Department of Physics, University of Bath — 5Cavendish Laboratory, University of Cambridge — 6Kirchhoff Institut für Physik, Universität Heidelberg

The outstanding optoelectronic properties of hybrid metal halide perovskites, and their strong spin-orbit coupling, enable efficient manipulation of the charge carrier’s angular momentum. In this work, we investigate the dominant spin relaxation mechanism in CH3NH3PbBr3 polycrystalline thin films with nominal doping levels up to 50% with the transition metal Mn2+ . We investigate the spin relaxation times in these paramagnetic hybrid semiconductors with ultrafast circularly polarized broadband transient absorption spectroscopy at cryogenic temperatures. Using quantitative theoretical analysis of the photoexcitation cooling processes, we identify increased carrier momentum scattering rates extending the spin relaxation lifetimes by a factor of three. We explain this observation with motional narrowing effects in the paramagnetic ensemble of Mn2+ impurities.

Keywords: Perovskite; Spin; Transient Absorption; Magnetic Doping

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