Weak Dispersion of Exciton Landé Factor with Band Gap Energy in Lead Halide Perovskites: Approximate Compensation of the Electron and Hole Dependences.

Autor: Kopteva NE; Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany., Yakovlev DR; Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany., Kirstein E; Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany., Zhukov EA; Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany., Kudlacik D; Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany., Kalitukha IV; Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia., Sapega VF; Ioffe Institute, Russian Academy of Sciences, St. Petersburg, 194021, Russia., Hordiichuk O; Department of Chemistry and Applied Biosciences, Laboratory of Inorganic Chemistry, ETH Zürich, Zürich, 8093, Switzerland.; Department of Advanced Materials and Surfaces, Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, 8600, Switzerland., Dirin DN; Department of Chemistry and Applied Biosciences, Laboratory of Inorganic Chemistry, ETH Zürich, Zürich, 8093, Switzerland., Kovalenko MV; Department of Chemistry and Applied Biosciences, Laboratory of Inorganic Chemistry, ETH Zürich, Zürich, 8093, Switzerland.; Department of Advanced Materials and Surfaces, Laboratory for Thin Films and Photovoltaics, Empa-Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, 8600, Switzerland., Baumann A; Experimental Physics VI, Julius-Maximilian University of Würzburg, 97074, Würzburg, Germany., Höcker J; Experimental Physics VI, Julius-Maximilian University of Würzburg, 97074, Würzburg, Germany., Dyakonov V; Experimental Physics VI, Julius-Maximilian University of Würzburg, 97074, Würzburg, Germany., Crooker SA; National High Magnetic Field Laboratory, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA., Bayer M; Experimentelle Physik 2, Technische Universität Dortmund, 44227, Dortmund, Germany.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Apr; Vol. 20 (16), pp. e2300935. Date of Electronic Publication: 2023 Nov 27.
DOI: 10.1002/smll.202300935
Abstrakt: The optical properties of lead halide perovskite semiconductors in vicinity of the bandgap are controlled by excitons, so that investigation of their fundamental properties is of critical importance. The exciton Landé or g-factor g X is the key parameter, determining the exciton Zeeman spin splitting in magnetic fields. The exciton, electron, and hole carrier g-factors provide information on the band structure, including its anisotropy, and the parameters contributing to the electron and hole effective masses. Here, g X is measured by reflectivity in magnetic fields up to 60 T for lead halide perovskite crystals. The materials band gap energies at a liquid helium temperature vary widely across the visible spectral range from 1.520 up to 3.213 eV in hybrid organic-inorganic and fully inorganic perovskites with different cations and halogens: FA 0.9 Cs 0.1 PbI 2.8 Br 0.2 , MAPbI 3 , FAPbBr 3 , CsPbBr 3 , and MAPb(Br 0.05 Cl 0.95 ) 3 . The exciton g-factors are found to be nearly constant, ranging from +2.3 to +2.7. Thus, the strong dependences of the electron and hole g-factors on the bandgap roughly compensate each other when combining to the exciton g-factor. The same is true for the anisotropies of the carrier g-factors, resulting in a nearly isotropic exciton g-factor. The experimental data are compared favorably with model calculation results.
(© 2023 The Authors. Small published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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