Bandgap tunability at single-layer molybdenum disulphide grain boundaries

Yu Li Huang, Yifeng Chen, Wenjing Zhang, Su Ying Quek (), Chang-Hsiao Chen, Lain-Jong Li, Wei-Ting Hsu, Wen-Hao Chang, Yu Jie Zheng, Wei Chen and Andrew T. S. Wee ()
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Yu Li Huang: National University of Singapore
Yifeng Chen: National University of Singapore
Wenjing Zhang: National University of Singapore
Su Ying Quek: National University of Singapore
Chang-Hsiao Chen: Institute of Atomic and Molecular Sciences, Academia Sinica
Lain-Jong Li: Institute of Atomic and Molecular Sciences, Academia Sinica
Wei-Ting Hsu: National Chiao Tung University
Wen-Hao Chang: National Chiao Tung University
Yu Jie Zheng: National University of Singapore
Wei Chen: National University of Singapore
Andrew T. S. Wee: National University of Singapore

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7298

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