Please use this identifier to cite or link to this item: https://scholarbank.nus.edu.sg/handle/10635/170920
Title: Bandgap tunability at single-layer molybdenum disulphide grain boundaries
Authors: Huang, Yu Li 
Chen, Yifeng 
Zhang, Wenjing 
Quek, Su Ying 
Chen, Chang-Hsiao
Li, Lain-Jong
Hsu, Wei-Ting
Chang, Wen-Hao
Zheng, Yu Jie
Chen, Wei 
Wee, Andrew TS 
Keywords: Science & Technology
Multidisciplinary Sciences
Science & Technology - Other Topics
TRANSITION-METAL DICHALCOGENIDES
MAGNETIC-PROPERTIES
MONOLAYER MOS2
STRAIN
GRAPHENE
PHOTOLUMINESCENCE
SPECTROSCOPY
DEFECTS
BILAYER
GROWTH
Issue Date: 17-Feb-2015
Publisher: NATURE PUBLISHING GROUP
Citation: Huang, Yu Li, Chen, Yifeng, Zhang, Wenjing, Quek, Su Ying, Chen, Chang-Hsiao, Li, Lain-Jong, Hsu, Wei-Ting, Chang, Wen-Hao, Zheng, Yu Jie, Chen, Wei, Wee, Andrew TS (2015-02-17). Bandgap tunability at single-layer molybdenum disulphide grain boundaries. NATURE COMMUNICATIONS 6 (1). ScholarBank@NUS Repository.
Abstract: Two-dimensional transition metal dichalcogenides have emerged as a new class of semiconductor materials with novel electronic and optical properties of interest to future nanoelectronics technology. Single-layer molybdenum disulphide, which represents a prototype two-dimensional transition metal dichalcogenide, has an electronic bandgap that increases with decreasing layer thickness. Using high-resolution scanning tunnelling microscopy and spectroscopy, we measure the apparent quasiparticle energy gap to be 2.40±0.05 eV for single-layer, 2.10±0.05 eV for bilayer and 1.75±0.05 eV for trilayer molybdenum disulphide, which were directly grown on a graphite substrate by chemical vapour deposition method. More interestingly, we report an unexpected bandgap tunability (as large as 0.85±0.05 eV) with distance from the grain boundary in single-layer molybdenum disulphide, which also depends on the grain misorientation angle. This work opens up new possibilities for flexible electronic and optoelectronic devices with tunable bandgaps that utilize both the control of two-dimensional layer thickness and the grain boundary engineering.
Source Title: NATURE COMMUNICATIONS
URI: https://scholarbank.nus.edu.sg/handle/10635/170920
ISSN: 20411723
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