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

Author:

Kopteva Natalia E.1ORCID,Yakovlev Dmitri R.1ORCID,Kirstein Erik1ORCID,Zhukov Evgeny A.1ORCID,Kudlacik Dennis1ORCID,Kalitukha Ina V.2ORCID,Sapega Victor F.2ORCID,Hordiichuk Oleh34,Dirin Dmitry N.3ORCID,Kovalenko Maksym V.34ORCID,Baumann Andreas5ORCID,Höcker Julian5ORCID,Dyakonov Vladimir5ORCID,Crooker Scott A.6ORCID,Bayer Manfred1ORCID

Affiliation:

1. Experimentelle Physik 2 Technische Universität Dortmund 44227 Dortmund Germany

2. Ioffe Institute Russian Academy of Sciences St. Petersburg 194021 Russia

3. Department of Chemistry and Applied Biosciences Laboratory of Inorganic Chemistry ETH Zürich Zürich 8093 Switzerland

4. Department of Advanced Materials and Surfaces Laboratory for Thin Films and Photovoltaics Empa–Swiss Federal Laboratories for Materials Science and Technology Dübendorf 8600 Switzerland

5. Experimental Physics VI Julius‐Maximilian University of Würzburg 97074 Würzburg Germany

6. National High Magnetic Field Laboratory Los Alamos National Laboratory Los Alamos NM 87545 USA

Abstract

AbstractThe 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 gX 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, gX 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: FA0.9Cs0.1PbI2.8Br0.2, MAPbI3, FAPbBr3, CsPbBr3, and MAPb(Br0.05Cl0.95)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.

Funder

Deutsche Forschungsgemeinschaft

Russian Foundation for Basic Research

Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung

Eidgenössische Technische Hochschule Zürich

Publisher

Wiley

Subject

Biomaterials,Biotechnology,General Materials Science,General Chemistry

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