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

AUTHORS

Garcia-Arella Guadalupe
Trippé-Allard Gaëlle
Campos Thomas
Bernardot Frédérick
Legrand Laurent
Garrot Damien
Deleporte Emmanuelle
Testelin Christophe
Chamarro Maria

KEYWORDS

Halide perovskite

CH 3 NH 3 PbI 3

G-factor

Polycrystalline film

Photo-induced Faraday rotation

Document type

Journal articles

Résumé

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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