Regensburg 2022 – scientific programme
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O: Fachverband Oberflächenphysik
O 42: Metal substrates 2
O 42.1: Talk
Wednesday, September 7, 2022, 10:30–10:45, S053
Atomic structure determination of epitaxially grown tin perovskite CsSnBr3 on gold surfaces — •Madad Abbasli1, Jenny Schrage1, Jiaqi Cai1, Jeremy Hieulle2, Alex Redinger2, Carsten Busse1, and Robin Ohmann1 — 1University of Siegen, Department of Physics, Germany — 2University of Luxembourg, Department of Physics and Materials Science, Luxembourg
Tin perovskites can be efficient and environmentally friendly substitutions to lead perovskites, but they have a drawback due to oxidation from Sn2+ to Sn4+. Here, we present an in-situ study of epitaxially grown CsSnBr3 on Au(111) and Au(100) in ultrahigh vacuum (UHV) using scanning tunneling microscopy (STM), low energy electron diffraction (LEED) and x-ray photoelectron spectroscopy (XPS). By co-evaporation of the precursor molecules CsBr and SnBr2 submonolayers up to a few monolayers are obtained. On Au(111), CsSnBr3 grows in three differently oriented domains due to the hexagonal symmetry of the substrate. On Au(100), which has square symmetry, identical to CsSnBr3, but with about half of the lattice constant of the perovskite, we observe a (2x2) superstructure. Chemical analysis shows no indication of tin oxidation, which demonstrates the importance of preparation of tin perovskites in vacuum using evaporation.