Berlin 2024 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 32: Spin Phenomena in Semiconductors

HL 32.3: Talk

Wednesday, March 20, 2024, 15:30–15:45, EW 015

Extended Spin Lifetimes in Transition Metal Doped Hybrid Lead Halide Perovskites — •Jonathan Zerhoch^1,2,3, Stanislav Bodnar¹, Jamie Lerpiniere⁴, Shangpu Liu^1,2,3, Timo Neumann^2,3,5, Barbara Sergl^2,3, Markus W. Heindl^1,2,3, Andrii Shcherbakov^1,2,3, Ahmed Elghandour⁶, Rüdiger Klingeler⁶, Alison Walker⁴, and Felix Deschler¹ — ¹Physikalisch-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