Direct Chemical Vapor Deposition Growth and Band-Gap Characterization of MoS2/h-BN van der Waals Heterostructures on Au Foils.
Stacked transition-metal dichalcogenides on hexagonal boron nitride (h-BN) are platforms for high-performance electronic devices. However, such vertical stacks are usually constructed by the layer-by-layer polymer-assisted transfer of mechanically exfoliated layers. This inevitably causes interfacial contamination and device performance degradation. Herein, we develop a two-step, low-pressure chemical vapor deposition synthetic strategy incorporating the direct growth of monolayer h-BN on Au foil with the subsequent growth of MoS2. In such vertical stacks, the interactions between MoS2and Au are diminished by the intervening h-BN layer, as evidenced by the appearance of photoluminescence in MoS2. The weakened interfacial interactions facilitate the transfer of the MoS2/h-BN stacks from Au to arbitrary substrates by an electrochemical bubbling method. Scanning tunneling microscope/spectroscopy characterization shows that the central h-BN layer partially blocks the metal-induced gap states in MoS2/h-BN/Au foils. The work offers insight into the synthesis, transfer, and device performance optimization of such vertically stacked heterostructures.
Zhepeng
Z
Zhang
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou, Zhejiang 310027, P. R. China.
Xujing
X
Ji
Jianping
J
Shi
Xiebo
X
Zhou
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology , Beijing 100190, P. R. China.
Shuai
S
Zhang
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University , Wuhan 430072, P. R. China.
Yue
Y
Hou
Yue
Y
Qi
Qiyi
Q
Fang
Qingqing
Q
Ji
Yu
Y
Zhang
Min
M
Hong
Pengfei
P
Yang
CAS Key Laboratory of Standardization and Measurement for Nanotechnology, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology , Beijing 100190, P. R. China.
Xinfeng
X
Liu
Qing
Q
Zhang
Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, School of Physics and Technology, Wuhan University , Wuhan 430072, P. R. China.
Lei
0000-0003-1325-2410
L
Liao
State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University , Hangzhou, Zhejiang 310027, P. R. China.
Chuanhong
C
Jin
Zhongfan
0000-0003-0065-7988
Z
Liu
Yanfeng
0000-0003-1319-3270
Y
Zhang
Au foil; MoS2/h-BN; chemical vapor deposition growth; transfer; van der Waals heterostructure