Regensburg 2022 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 20: Poster
DS 20.42: Poster
Mittwoch, 7. September 2022, 16:00–18:00, P3
Combinatorial Synthesis of Pb1-xSnxSe Films with Sputter Deposition — •Thomas Schmidt, Peter Kerres, and Matthias Wuttig — RWTH Aachen University, Aachen, Germany
PbSe and SnSe are two chalcogenides with a wide range of applications of their properties, in particular as thermoelectrics. Interestingly, these two iso-electronic materials employ different bonding mechanisms. While at room temperature SnSe utilizes covalent bonds, PbSe is characterized by a more unconventional bonding mechanism, coined metavalent bonding. Therefore, we expect significant property changes upon crossing the border between those two bonding mechanisms. Such a change opens up the possibility to tailor material properties with sample stoichiometry. We have thus studied optical and electrical properties of Pb1-xSnxSe films as a function of stoichiometry. Effective sample-production has been employed to facilitate this analysis. In this study the compositions around x=0.5, at which a structural transition is expected, are confocally sputtered and subsequently analyzed. The two targets PbSe (cubic structure) and SnSe (orthorhombic structure) were focused on the different ends of the 7.5 cm long Si-substrate. The resulting stoichiometry gradient in the sample was determined by energy dispersive X-ray spectroscopy and linked to the evolution of structure (X-ray diffraction) and optical properties (spectroscopic ellipsometry and reflectometry).