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Unexpected Anisotropy of the Electron and Hole Landé g-Factors in Perovskite CH3NH3PbI3 Polycrystalline Films

Abstract : In this work, we studied, at low temperature, the coherent evolution of the localized electron and hole spins in a polycrystalline film of CH3NH3PbI3 (MAPI) by using a picosecond-photo-induced Faraday rotation technique in an oblique magnetic field. We observed an unexpected anisotropy for the electron and hole spin. We determined the electron and hole Landé factors when the magnetic field was applied in the plane of the film and perpendicular to the exciting light, denoted as transverse ⊥ factors, and when the magnetic field was applied perpendicular to the film and parallel to the exciting light, denoted as parallel ∥ factors. We obtained |ge,⊥|=2.600 ± 0.004, ∣∣ge,∥∣∣=1.604 ± 0.033 for the electron and |gh,⊥|=0.406 ± 0.002, ∣∣gh,∥∣∣=0.299 ± 0.007 for the hole. Possible origins of this anisotropy are discussed herein
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https://hal.sorbonne-universite.fr/hal-03648330
Contributor : Laurent Legrand Connect in order to contact the contributor
Submitted on : Thursday, April 21, 2022 - 2:05:00 PM
Last modification on : Friday, August 5, 2022 - 2:58:08 PM
Long-term archiving on: : Friday, July 22, 2022 - 7:18:21 PM

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Guadalupe Garcia-Arella, Gaëlle Trippé-Allard, Thomas Campos, Frédérick Bernardot, Laurent Legrand, et al.. Unexpected Anisotropy of the Electron and Hole Landé g-Factors in Perovskite CH3NH3PbI3 Polycrystalline Films. Nanomaterials, MDPI, 2022, 12 (9), pp.1399. ⟨10.3390/nano12091399⟩. ⟨hal-03648330⟩

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