SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 64: Poster Session V: Electronic structure of surfaces: Spectroscopy, surface states III
O 64.5: Poster
Mittwoch, 3. März 2021, 10:30–12:30, P
Surface atomic and electronic structure of CsPbBr3 — •Janek Rieger, Tilman Kißlinger, M. Alexander Schneider, Thomas Fauster, and Daniel Niesner — Lehrstuhl für Festkörperphysik, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Staudtstr. 7, D-91058 Erlangen, Germany
Lead-halide-based semiconductors with the perovskite structure (LHPs) and the empirical formula ABX3 (where A=Cs, CH3NH3, B=Pb and X=I, Br, Cl) tend to form stable (001) surfaces, which can exhibit AX and BX2 surface terminations. A giant Rashba splitting of the valence bands backfolded to the Γ point could be observed for the BX2 termination, but not for the AX-terminated surfaces of organic-inorganic LHPs (A=CH3NH3) [1].
For a systematic study of the interplay between surface atomic and electronic structure of purely inorganic LHPs, we carried out low-energy electron diffraction (LEED), scanning tunneling microscopy (STM) and angle-resolved photoelectron spectroscopy (ARPES) on CsPbBr3. From our STM and LEED results we can identify the prevalence of two different surface terminations for different preparations. The different terminations exhibit distinct spectral features in photoemission spectroscopy. ARPES results indicate no Rashba splitting and no band backfolding of the valence bands for the CsBr termination in line with earlier observations [2].
[1] J. Yang et al., Phys. Rev. B 102, 245101 (2020).
[2] M. Puppin et al., Phys. Rev. Lett. 124, 206402 (2020).