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O: Fachverband Oberflächenphysik

O 79: 2D Materials V: Growth, Structure and Substrate Interaction

O 79.3: Talk

Thursday, March 21, 2024, 11:00–11:15, MA 005

Growth of Titanium Ditelluride on Au(111) — •Andreas Raabgrund, Hannah Loh, Alexander Wegerich, Tilman Kisslinger, Lutz Hammer, and M. Alexander Schneider — Universität Erlangen-Nürnberg, 91058 Erlangen, Germany

Aiming at the MBE growth of transition metal ditelluride (MTe2) films, especially in the monolayer limit, the formation of and interaction with the substrate interface is of fundamental interest. The growth of a MTe2 film can be achieved either by the tellurization of the desired metal substrate [1] or by the deposition of Te [2] or any other chalcogenide [3] and a desired transition metal on a substrate of suitable choice.

In this contribution we follow the latter approach and investigate tellurium and titanium on Au(111) by LEED-IV, DFT, and STM. Starting from submonolayer coverages of Ti and Te, a first stable, ordered (3√3×3√3)R30^∘ superstructure is found. With increasing amount of Ti and a proper annealing step a (5×√3)_rect structure develops. For higher amounts of Te and Ti, a closed hexagonal film with a lateral lattice parameter of 4/3 times that of Au(111) is found by LEED and STM. STM topography and spectroscopy measurements indicate the growth of a TiTe2 layer on a Te containing interface to the Au(111) substrate.
[1] T. Kißlinger et al., Phys. Rev. B 108, 205412 (2023)
[2] K. Lasek et al., ACS Nano 14, 8473 (2020)
[3] S. G. Sørensen et al., ACS Nano 8, 6788 (2014)

Keywords: Titanium Telluride; TMDC; Au(111); STM; LEED-IV