Dresden 2020 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 25: Perovskite and photovoltaics I (joint session HL/CPP)

HL 25.2: Talk

Tuesday, March 17, 2020, 09:45–10:00, POT 251

Time resolved spin dynamics in lead halide hybrid organic perovskite Fa₀.9Cs₀.1PbI_2.8Br_0.2 — •Erik Kirstein¹, Eiko Evers¹, Vasilli V. Belykh^1,2, Evgeny A. Zhukov¹, Dennis Kudlacik¹, Ina V. Kalitukha³, Olga Nazarenko⁴, Maxim V. Kovalenko^4,5, Dmtri R. Yakovlev^1,3, and Manfred Bayer^1,3 — ¹Experimentelle Physik 2, Technische Universität Dortmund, D-44227 Dortmund, Germany — ²P.N. Lebedev Physical Institute, Russian Academy of Sciences, 119991 Moscow, Russia — ³Ioffe Institute, Russian Academy of Sciences,194021 St. 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 high quantum efficiency and easy synthesis. Spin dynamics in perovskite materials is not studied in detail so far, but shows promising results. The studied Fa_0.9Cs_0.1PbI_2.8Br_0.2 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.