Tunability of the Superconductivity of NbSe2 Films Grown by Two-Step Vapor Deposition

Huihui Lin; Meijuan Chang; Xingjie Fu; Pengfei Li; Maoxin Chen; Luyan Wu; Fangqi Yang; Quan Zhang

doi:10.3390/molecules28031059

Tunability of the Superconductivity of NbSe₂ Films Grown by Two-Step Vapor Deposition

Molecules. 2023 Jan 20;28(3):1059. doi: 10.3390/molecules28031059.

Authors

Huihui Lin¹, Meijuan Chang^{1

2}, Xingjie Fu¹, Pengfei Li¹, Maoxin Chen¹, Luyan Wu³, Fangqi Yang³, Quan Zhang⁴

Affiliations

¹ Department of Chemistry, National University of Singapore, Singapore 117549, Singapore.
² Institute for Functional Intelligent Materials, Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore.
³ Key Laboratory for Organic Electronics and Information Displays, Jiangsu Key Laboratory for Biosensors, Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts and Telecommunications, Nanjing 210023, China.
⁴ College of Chemistry and Chemical Engineering, Hubei Normal University, Huangshi 435002, China.

Abstract

Layered metallic transition-metal dichalcogenides (TMDCs) are ideal platforms for exploring their fascinating electronic properties at two-dimensional limits, such as their charge density wave (CDW) and superconductivity. Therefore, developing ways to improve the crystallization quality of TMDCs is urgently needed. Here we report superconductively tunable NbSe₂ grown by a two-step vapor deposition method. By optimizing the sputtering conditions, superconducting NbSe₂ films were prepared from highly crystalline Nb films. The bilayer NbSe₂ films showed a superconducting transition temperature that was up to 3.1 K. Similar to the salt-assisted chemical vapor deposition (CVD) method, superconducting monolayer NbSe₂ crystals were also grown from a selenide precursor, and the growth strategy is suitable for many other TMDCs. Our growth method not only provides a way to improve the crystalline quality of TMDC films, but also gives new insight into the growth of monolayer TMDCs. It holds promise for exploring two-dimensional TMDCs in fundamental research and device applications.

Keywords: NbSe2; superconductor; transition-metal dichalcogenides (TMDCs); two-step vapor deposition.

Abstract

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