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Single-oriented epitaxial MoS2

Using a combination of surface science techniques, including XPS, XPD, STM and ARPES we succesfully demonstrate a protocol for the synthesis through physical vapor deposition of SL MoS2 on Au(111) with a single domain orientation featuring large area and a low concentration of defects. The observed complete spin reversal of the states near K and –K points of the Brillouin zone makes this layer ideal for spin-valleytronics applications.

H. Bana et al., 2D Mater. 5, 035012 (2018).

Transition metal dichalcogenides (TMDCs) are a rising star among other two-dimensional materials, in view of a possible usage in building new electronic devices.
In particular, the employment of single layer (SL) MoS2, the prototypical TMDC, for electronic devices, demands a controllable growth of highly crystalline layers featuring large area with a low concentration of defects to preserve its outstanding electronic properties. Moreover, given the peculiar electronic structure, new degrees of freedom are accessible allowing for spin- and valley-dependent phenomena, that can be retained in devices only through singly-oriented domains.
Current chemical vapor deposition methods have not been able to achieve this and have produced mirror twin domains leading to the formation of domain boundaries and dislocations in the layer.

We present a protocol to synthesize a singly-oriented SL MoS2 on Au(111) based on the physical vapor deposition technique where the ideal growth conditions were determined by monitoring the growth by fast-XPS.

We investigated the structural properties using a combination of surface science techniques, including scanning tunneling microscopy (STM) and x-ray photoelectron diffraction (XPD). In particular, the latter was pivotal in determining the single-orientation of the grown MoS2 layer. Moreover, Angular resolved photoemission measurements (ARPES), confirmed the single layer character and the high structural quality of MoS2 while the single domain orientation allowed the measurement, through spin-resolved ARPES of the complete spin polarization with spin reversal of the states near K and -K points of the MoS2 Brillouin zone.

Retrieve article
Epitaxial growth of single-orientation high-quality MoS2 monolayers;
H. Bana, E. Travaglia, L. Bignardi, P. Lacovig, C. E. Sanders, M. Dendzik, M. Michiardi, M. Bianchi, D. Lizzit, F. Presel, D. De Angelis, N. Apostol, P. Kumar Das, J. Fujii, I. Vobornik, R. Larciprete, A. Baraldi, P. Hofmann, and S. Lizzit;
2D Mater. 5, 035012 (2018).
10.1088/2053-1583/aabb74
Last Updated on Tuesday, 06 August 2019 13:22