Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.92: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Time resolved spin dynamics in lead halide hybrid organic perovskite Fa0.9Cs0.1PbI2.8Br0.2 — •Erik Kirstein1, Eiko Evers1, Vasilli V. Belykh1,2, Evgeny A. Zhukov1, Dennis Kudlacik1, Ina V. Kalitukha3, Olga Nazarenko4, Maxim V. Kovalenko4,5, Dmtri R. Yakovlev1,3, and Manfred Bayer1,31Experimentelle Physik 2, Technische Universität Dortmund, D-44227 Dortmund, Germany — 2Moscow, Russia — 3St. Petersburg, Russia — 4Laboratory of Inorganic Chemistry, ETH Zürich, CH-8093 Zürich, Switzerland — 5Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland

Lead halide hybrid organic perovskites attract increased attention due their promising applications, related to their high quantum efficiency and easy synthesis. The spin dynamics in perovskite materials is not studied in detail so far, but shows promising results. The studied Fa0.9Cs0.1PbI2.8Br0.2 bulk sample was grown out of solution of respective ions in polar solvents. Its bandgap of 1.51 eV makes this material well-suited for the resonant excitation with Ti:Sapphire laser. We study the coherent spin dynamics of electrons and holes by means of time-resolved pump-probe Kerr rotation technique at cryogenic temperatures and magnetic fields up to 6 T. We measure longitudinal spin relaxation times T1, transverse dephasing times T2*, g-factor values and their spread Δg.

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