The Landé factors of electrons and holes in lead halide perovskites: universal dependence on the band gap.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 35654813.
- Also identified by DOI 10.1038/s41467-022-30701-0 and PMC identifier 9163162.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
The Landé or g-factors of charge carriers are decisive for the spin-dependent phenomena in solids and provide also information about the underlying electronic band structure. We present a comprehensive set of experimental data for values and anisotropies of the electron and hole Landé factors in hybrid organic-inorganic (MAPbI<sub>3</sub>, MAPb(Br<sub>0.5</sub>Cl<sub>0.5</sub>)<sub>3</sub>, MAPb(Br<sub>0.05</sub>Cl<sub>0.95</sub>)<sub>3</sub>, FAPbBr<sub>3</sub>, FA<sub>0.9</sub>Cs<sub>0.1</sub>PbI<sub>2.8</sub>Br<sub>0.2</sub>, MA=methylammonium and FA=formamidinium) and all-inorganic (CsPbBr<sub>3</sub>) lead halide perovskites, determined by pump-probe Kerr rotation and spin-flip Raman scattering in magnetic fields up to 10 T at cryogenic temperatures. Further, we use first-principles density functional theory (DFT) calculations in combination with tight-binding and k ⋅ p approaches to calculate microscopically the Landé factors. The results demonstrate their universal dependence on the band gap energy across the different perovskite material classes, which can be summarized in a universal semi-phenomenological expression, in good agreement with experiment.