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- Lee, Zonghoon
- Atomic-Scale Electron Microscopy Lab.
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Controllable synthesis of molybdenum tungsten disulfide alloy for vertically composition-controlled multilayer
- Author(s)
- Song, Jeong-Gyu, Ryu, Gyeong Hee, Lee, Su Jeong, Sim, Sangwan, Lee, Chang Wan, Choi, Taejin, Jung, Hanearl, Kim, Youngjun, Lee, Zonghoon, Myoung, Jae-Min, Dussarrat, Christian, Lansalot-Matras, Clement, Park, Jusang, Choi, Hyunyong, Kim, Hyungjun
- Issued Date
- 2015-07
- Citation
- NATURE COMMUNICATIONS, v.6, pp.7817
- 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 Mo
1-x Wx S2 alloy using sulfurization of super-cycle atomic layer deposition Mo1-x Wx Oy . Various spectroscopic and microscopic results indicate that the synthesized Mo1-x Wx S2 alloys have complete mixing of Mo and Watoms and tunable band gap by systematically controlled composition and layer number. Based on this, we synthesize a vertically composition-controlled (VCC) Mo1-x Wx S2 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-x Wx S2 multilayer has different vertical composition and broadband light absorption with strong interlayer coupling within a VCC Mo1-x Wx S2 multilayer. Further, we demonstrate that a VCC Mo1-x Wx S2 multilayer photodetector generates three to four times greater photocurrent than MoS2 -and WS2 -based devices, owing to the broadband light absorption. © 2015 Macmillan Publishers Limited
- Publisher
- NATURE PUBLISHING GROUP
- ISSN
- 2041-1723
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