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HL: Fachverband Halbleiterphysik
HL 19: Focus Session: When theory meets experiment: Hybrid halide perovskites for applications beyond solar II (joint session HL/CPP)
HL 19.5: Vortrag
Montag, 16. März 2020, 16:30–16:45, POT 251
Surface atomic and electronic structure of CsPbBr3 inorganic perovskite — •Janek Rieger, Felix Trunk, Thomas Fauster, and Daniel Niesner — Lehrstuhl für Festkörperphysik, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Staudtstr. 7, D-91058 Erlangen, Germany
The crystallographic orientation of the surface has a strong impact on the performance of solar cells built from lead-halide perovskites [1].
For a systematic study of the surface carrier-dynamics, we prepare atomically well-defined (001) surfaces of the inorganic perovskite CsPbBr3 by epitaxial growth in ultra-high vacuum. Low-energy electron diffraction was carried out to analyze the resulting samples.
The measured surface unit cell as well as the corresponding phase transitions differ from the bulk-terminated ones. Angle-resolved photoelectron spectroscopy finds a valence-band structure in line with data we obtained from single crystals. Finally, we also investigated the energetics of the conduction-band electrons using two-photon photoelectron spectroscopy. From the positions of the valence-band maximum and the conduction-band minimum we conclude that our CsPbBr3 samples are intrinsic.
[1] S. Y. Leblebici et al., Nat. Energy 1.8, 16093 (2016).