Pressure-induced semiconducting to metallic transition in multilayered molybdenum disulphide

Avinash P. Nayak, Swastibrata Bhattacharyya, Jie Zhu, Jin Liu, Xiang Wu, Tribhuwan Pandey, Changqing Jin, Abhishek K. Singh, Deji Akinwande () and Jung-Fu Lin
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Avinash P. Nayak: The University of Texas at Austin
Swastibrata Bhattacharyya: Materials Research Center, Indian Institute of Science
Jie Zhu: The University of Texas at Austin
Jin Liu: The University of Texas at Austin
Xiang Wu: The University of Texas at Austin
Tribhuwan Pandey: Materials Research Center, Indian Institute of Science
Changqing Jin: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
Abhishek K. Singh: Materials Research Center, Indian Institute of Science
Deji Akinwande: The University of Texas at Austin
Jung-Fu Lin: The University of Texas at Austin

Nature Communications, 2014, vol. 5, issue 1, 1-9

Abstract: Abstract Molybdenum disulphide is a layered transition metal dichalcogenide that has recently raised considerable interest due to its unique semiconducting and opto-electronic properties. Although several theoretical studies have suggested an electronic phase transition in molybdenum disulphide, there has been a lack of experimental evidence. Here we report comprehensive studies on the pressure-dependent electronic, vibrational, optical and structural properties of multilayered molybdenum disulphide up to 35 GPa. Our experimental results reveal a structural lattice distortion followed by an electronic transition from a semiconducting to metallic state at ~19 GPa, which is confirmed by ab initio calculations. The metallization arises from the overlap of the valance and conduction bands owing to sulphur–sulphur interactions as the interlayer spacing reduces. The electronic transition affords modulation of the opto-electronic gain in molybdenum disulphide. This pressure-tuned behaviour can enable the development of novel devices with multiple phenomena involving the strong coupling of the mechanical, electrical and optical properties of layered nanomaterials.

Date: 2014
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DOI: 10.1038/ncomms4731

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