van der Waals Self-Epitaxial Growth of Inch-Sized Superconducting Niobium Diselenide Films

Liang Ma; Xiaohan Wang; Hao Wang; Xiangyi Wang; Guifu Zou; Yanqiu Guan; Shuya Guo; Haochen Li; Qi Chen; Lin Kang; Labao Zhang; Peiheng Wu

doi:10.1021/acs.nanolett.3c01283

van der Waals Self-Epitaxial Growth of Inch-Sized Superconducting Niobium Diselenide Films

Nano Lett. 2023 Aug 9;23(15):6892-6899. doi: 10.1021/acs.nanolett.3c01283. Epub 2023 Jul 20.

Authors

Liang Ma¹, Xiaohan Wang¹, Hao Wang^{1

2}, Xiangyi Wang³, Guifu Zou³, Yanqiu Guan¹, Shuya Guo¹, Haochen Li¹, Qi Chen¹, Lin Kang^{1

2

4}, Labao Zhang^{1

2

4}, Peiheng Wu^{1

2}

Affiliations

¹ Research Institute of Superconductor Electronics, Nanjing University, Nanjing 210023, China.
² Hefei National Laboratory, Hefei 230088, China.
³ College of Energy, Soochow Institute for Energy and Materials Innovations, and Key Laboratory of Advanced Carbon Materials and Wearable Energy Technologies of Jiangsu Province, Soochow University, Suzhou 215123, China.
⁴ Synergetic Innovation Center of Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.

PMID: 37470724
DOI: 10.1021/acs.nanolett.3c01283

Abstract

Ultrathin superconducting films are the basis of superconductor devices. van der Waals (vdW) NbSe₂ with noncentrosymmetry exhibits exotic superconductivity and shows promise in superconductor electronic devices. However, the growth of inch-scale NbSe₂ films with layer regulation remains a challenge because vdW structural material growth is strongly dependent on the epitaxial guidance of the substrate. Herein, a vdW self-epitaxy strategy is developed to eliminate the substrate driving force in film growth and realize inch-sized NbSe₂ film growth with thicknesses from 2.1 to 12.1 nm on arbitrary substrates. The superconducting transition temperature of 5.1 K and superconducting transition width of 0.30 K prove the top homogeneity and quality of superconductivity among all of the synthetic NbSe₂ films. Coupled with a large area and substrate compatibility, this work paves the way for developing NbSe₂ superconductor electronics.

Keywords: chemical solution deposition; niobium diselenide; transition metal dichalcogenide films; two-dimensional superconductors; van der Waals epitaxy.