Fabrication of MoSe2 nanoribbons via an unusual morphological phase transition

Yuxuan Chen, Ping Cui, Xibiao Ren, Chendong Zhang, Chuanhong Jin, Zhenyu Zhang () and Chih-Kang Shih ()
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Yuxuan Chen: University of Texas at Austin
Ping Cui: International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
Xibiao Ren: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Chendong Zhang: University of Texas at Austin
Chuanhong Jin: State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University
Zhenyu Zhang: International Center for Quantum Design of Functional Materials (ICQD), Hefei National Laboratory for Physical Sciences at the Microscale, and Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China
Chih-Kang Shih: University of Texas at Austin

Nature Communications, 2017, vol. 8, issue 1, 1-9

Abstract: Abstract Transition metal dichalcogenides (TMDs) are a family of van der Waals layered materials exhibiting unique electronic, optical, magnetic and transport properties. Their technological potentials hinge critically on the ability to achieve controlled fabrication of desirable nanostructures, such as nanoribbons and nanodots. To date, nanodots/nanoislands have been regularly observed, while controlled fabrication of TMD nanoribbons remains challenging. Here we report a bottom-up fabrication of MoSe2 nanoribbons using molecular beam epitaxy, via an unexpected temperature-induced morphological phase transition from the nanodot to nanoribbon regime. Such nanoribbons are of zigzag nature, characterized by distinct chemical and electronic properties along the edges. The phase space for nanoribbon growth is narrowly defined by proper Se:Mo ratios, as corroborated experimentally using different Se fluxes, and supported theoretically using first-principles calculations that establish the crucial role of the morphological reconstruction of the bare Mo-terminated edge. The growth mechanism revealed should be applicable to other TMD systems.

Date: 2017
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DOI: 10.1038/ncomms15135

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