Regensburg 2019 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: Perovskite and Hybrid Photovolatics II (joint session HL/CPP)

HL 43.1: Vortrag

Donnerstag, 4. April 2019, 15:00–15:15, H36

Valence band structure of CsPbBr3 inorganic perovskite — •Janek Rieger1, Daniel Niesner1, Andrii Kanak2, Petro Fochuk2, Ievgen Levchuk3, Christoph Brabec3, and Thomas Fauster11Lehrstuhl für Festkörperphysik, University of Erlangen-Nürnberg, Staudtstr. 7, D-91058 Erlangen, Germany — 2Department of General Chemistry and Material Science, Yuriy Fedkovych Chernivtsi National University, Kotsjubynskyi St. 2, Chernivtsi, 58012, Ukraine — 3I-MEET, Department of Materials Science and Engineering, University of Erlangen-Nürnberg, Martensstr. 7, D-91058 Erlangen, Germany

The impact of the organic ion on the electronic properties of lead halide perovskites is matter of an ongoing debate. With angle-resolved photoelectron spectroscopy we investigated the properties of the valence bands of different perovskite single crystals cleaved in ultra-high vacuum. The talk focusses on recent results from the inorganic perovskite CsPbBr3. Measurements were carried out in the temperature range from 87 K to 350 K, covering all bulk phase transitions of the material. The width of the valence band and the dispersion of the valence band maximum are discussed. Results are compared to the valence band structure of the organic-inorganic perovskite (HC(NH2)2)PbBr3 as well as to (CH3NH3)PbBr3, which was already investigated in detail by our group [1].
D. Niesner et al., Phys. Rev. Lett. 117, 126401 (2016).

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