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  • Title: HfSe2 thin films: 2D transition metal dichalcogenides grown by molecular beam epitaxy.
    Author: Yue R, Barton AT, Zhu H, Azcatl A, Pena LF, Wang J, Peng X, Lu N, Cheng L, Addou R, McDonnell S, Colombo L, Hsu JW, Kim J, Kim MJ, Wallace RM, Hinkle CL.
    Journal: ACS Nano; 2015 Jan 27; 9(1):474-80. PubMed ID: 25496648.
    Abstract:
    In this work, we demonstrate the growth of HfSe2 thin films using molecular beam epitaxy. The relaxed growth criteria have allowed us to demonstrate layered, crystalline growth without misfit dislocations on other 2D substrates such as highly ordered pyrolytic graphite and MoS2. The HfSe2 thin films exhibit an atomically sharp interface with the substrates used, followed by flat, 2D layers with octahedral (1T) coordination. The resulting HfSe2 is slightly n-type with an indirect band gap of ∼ 1.1 eV and a measured energy band alignment significantly different from recent DFT calculations. These results demonstrate the feasibility and significant potential of fabricating 2D material based heterostructures with tunable band alignments for a variety of nanoelectronic and optoelectronic applications.
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