SKM 2023 – scientific programme
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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 40.10: Talk
Wednesday, March 29, 2023, 17:15–17:30, GER 37
Growth and structure of two-dimensional single-layer HfS2 on Au(111) — •Monika Schied, Paolo Lacovig, and Silvano Lizzit — Elettra-Sincrotrone Trieste
HfS2 is a promising 2D material for low-power semiconductor devices due to its predicted high electron mobility and low contact resistance for n-type carrier transport. For actual applications, layers with excellent structural and electronic properties are needed. However, films with the necessary quality are only available from exfoliation, which is neither scalable nor very reproducible and only few experimental studies on a single-layer (SL) of HfS2 have been performed so far. In analogy to the growth of high-quality SL transition metal dichalcogenides (TMDCs) such as MoS2 and WS2 [1,2] we have epitaxially grown an ordered layer of HfS2 on Au(111) by chemical vapour deposition (CVD). Monitoring the S 2p and Hf 4f core levels in real time by fast X-ray photoelectron spectroscopy (XPS) allows the fine-tuning of the relevant parameters – such as the dosing rate and temperature – during the growth. The characterization by X-ray photoelectron diffraction (XPD) and low-energy electron diffraction (LEED) gives insight into the crystal structure of the film grown in this way.
[1] Bana, H., et.al., 2D Mater. 5 035012 (2018)
[2] Bignardi, L. et.al., Phys. Rev. Mat. 3, 014003, (2019)