Controllable synthesis of molybdenum tungsten disulfide alloy for vertically composition-controlled multilayer

Jeong-Gyu Song, Gyeong Hee Ryu, Su Jeong Lee, Sangwan Sim, Chang Wan Lee, Taejin Choi, Hanearl Jung, Youngjun Kim, Zonghoon Lee, Jae-Min Myoung, Christian Dussarrat, Clement Lansalot-Matras, Jusang Park, Hyunyong Choi and Hyungjun Kim ()
Additional contact information
Jeong-Gyu Song: School of Electrical and Electronic Engineering, Yonsei University
Gyeong Hee Ryu: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Su Jeong Lee: Yonsei University
Sangwan Sim: School of Electrical and Electronic Engineering, Yonsei University
Chang Wan Lee: School of Electrical and Electronic Engineering, Yonsei University
Taejin Choi: School of Electrical and Electronic Engineering, Yonsei University
Hanearl Jung: School of Electrical and Electronic Engineering, Yonsei University
Youngjun Kim: School of Electrical and Electronic Engineering, Yonsei University
Zonghoon Lee: School of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST)
Jae-Min Myoung: Yonsei University
Christian Dussarrat: Air Liquide Laboratories
Clement Lansalot-Matras: Air Liquide Laboratories Korea
Jusang Park: School of Electrical and Electronic Engineering, Yonsei University
Hyunyong Choi: School of Electrical and Electronic Engineering, Yonsei University
Hyungjun Kim: School of Electrical and Electronic Engineering, Yonsei University

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract The effective synthesis of two-dimensional transition metal dichalcogenides alloy is essential for successful application in electronic and optical devices based on a tunable band gap. Here we show a synthesis process for Mo1−xWxS2 alloy using sulfurization of super-cycle atomic layer deposition Mo1−xWxOy. Various spectroscopic and microscopic results indicate that the synthesized Mo1−xWxS2 alloys have complete mixing of Mo and W atoms and tunable band gap by systematically controlled composition and layer number. Based on this, we synthesize a vertically composition-controlled (VCC) Mo1−xWxS2 multilayer using five continuous super-cycles with different cycle ratios for each super-cycle. Angle-resolved X-ray photoemission spectroscopy, Raman and ultraviolet–visible spectrophotometer results reveal that a VCC Mo1−xWxS2 multilayer has different vertical composition and broadband light absorption with strong interlayer coupling within a VCC Mo1−xWxS2 multilayer. Further, we demonstrate that a VCC Mo1−xWxS2 multilayer photodetector generates three to four times greater photocurrent than MoS2- and WS2-based devices, owing to the broadband light absorption.

Date: 2015
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DOI: 10.1038/ncomms8817

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