High-quality monolayer superconductor NbSe2 grown by chemical vapour deposition

Hong Wang, Xiangwei Huang, Junhao Lin, Jian Cui, Yu Chen, Chao Zhu, Fucai Liu, Qingsheng Zeng, Jiadong Zhou, Peng Yu, Xuewen Wang, Haiyong He, Siu Hon Tsang, Weibo Gao, Kazu Suenaga, Fengcai Ma, Changli Yang, Li Lu, Ting Yu, Edwin Hang Tong Teo (), Guangtong Liu () and Zheng Liu ()
Additional contact information
Hong Wang: Nanyang Technological University
Xiangwei Huang: Chinese Academy of Sciences
Junhao Lin: National Institute of Advanced Industrial Science and Technology (AIST)
Jian Cui: Chinese Academy of Sciences
Yu Chen: School of Physical and Mathematical Sciences, Nanyang Technological University
Chao Zhu: Nanyang Technological University
Fucai Liu: Nanyang Technological University
Qingsheng Zeng: Nanyang Technological University
Jiadong Zhou: Nanyang Technological University
Peng Yu: Nanyang Technological University
Xuewen Wang: Nanyang Technological University
Haiyong He: Nanyang Technological University
Siu Hon Tsang: Nanyang Technological University
Weibo Gao: School of Physical and Mathematical Sciences, Nanyang Technological University
Kazu Suenaga: National Institute of Advanced Industrial Science and Technology (AIST)
Fengcai Ma: Liaoning University
Changli Yang: Chinese Academy of Sciences
Li Lu: Chinese Academy of Sciences
Ting Yu: School of Physical and Mathematical Sciences, Nanyang Technological University
Edwin Hang Tong Teo: Nanyang Technological University
Guangtong Liu: Chinese Academy of Sciences
Zheng Liu: Nanyang Technological University

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

Abstract: Abstract The discovery of monolayer superconductors bears consequences for both fundamental physics and device applications. Currently, the growth of superconducting monolayers can only occur under ultrahigh vacuum and on specific lattice-matched or dangling bond-free substrates, to minimize environment- and substrate-induced disorders/defects. Such severe growth requirements limit the exploration of novel two-dimensional superconductivity and related nanodevices. Here we demonstrate the experimental realization of superconductivity in a chemical vapour deposition grown monolayer material—NbSe2. Atomic-resolution scanning transmission electron microscope imaging reveals the atomic structure of the intrinsic point defects and grain boundaries in monolayer NbSe2, and confirms the low defect concentration in our high-quality film, which is the key to two-dimensional superconductivity. By using monolayer chemical vapour deposited graphene as a protective capping layer, thickness-dependent superconducting properties are observed in as-grown NbSe2 with a transition temperature increasing from 1.0 K in monolayer to 4.56 K in 10-layer.

Date: 2017
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DOI: 10.1038/s41467-017-00427-5

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