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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: 2D Materials V: Growth, Structure and Substrate Interaction (joint session O/CPP)

CPP 40.9: Talk

Wednesday, March 29, 2023, 17:00–17:15, GER 37

Nucleation stage for the oriented growth of tantalum sulfide monolayers on Au(111) — •Thais Chagas¹, Kai Mehlich¹, Abdus Samad², Catherine Grover¹, Daniela Dombrowski^{1, 3}, Jiaqi Cai¹, Udo Schwingenschlögl², and Carsten Busse¹ — ¹Department Physik, Universität Siegen, Siegen, Germany — ²Physical Science and Engineering Division, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia — ³Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany

We study the nucleation stage in the epitaxial growth of monolayer TaS₂ as a model system for monolayer transition metal sulfides. The growth was done under ultra-high vacuum conditions with Au(111) as a substrate on which the metal atoms are evaporated, and the sulfur is provided from a background of H₂S. Using scanning tunneling microscopy (STM), we find small trimers with a well-defined triangular shape that act as nuclei for the further growth of extended tantalum sulfide monolayers. We identify these trimers as TaS₃ using density functional theory (DFT). We propose that the unique orientation of the trimers is the cause of the well-defined orientation of a complete TaS₂ layer found under favorable growth conditions.