SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Poster Session V: Electronic structure of surfaces: Spectroscopy, surface states III
O 64.4: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Surface electronic structure of CsSnBr3perovskite — •Jonas Hauner, Janek Rieger, Daniel Niesner, and Thomas Fauster — Friedrich-Alexander-Universität, Erlangen, Deutschland
Lead and tin halide based semiconductors with the perovskite structure show high dynamic disorder, i.e. local and instantaneous deviations from the ideal perovskite structure. These are expected to be larger for tin than for lead halide perovskites. Resulting local orientation of electric dipoles may drive unusual physical phenomena like dynamical Rashba or polaronic effects. While lead-based compounds are studied extensively, reports of tin-based compound surfaces are limited. We carried out angle-resolved photoelectron spectroscopy and two-photon photoelectron spectroscopy (2PPE) on (001) surfaces of CsSnBr3. The valence band maximum is found close to the Fermi level and thus the surfaces are p-doped. The valence band dispersion is consistent with a hole effective mass of m* < 0.2 me. Two unoccupied states are found by 2PPE.