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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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

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Title
Controllable synthesis of molybdenum tungsten disulfide alloy for vertically composition-controlled multilayer
Author
Song, Jeong-GyuRyu, Gyeong HeeLee, Su JeongSim, SangwanLee, Chang WanChoi, TaejinJung, HanearlKim, YoungjunLee, ZonghoonMyoung, Jae-MinDussarrat, ChristianLansalot-Matras, ClementPark, JusangChoi, HyunyongKim, Hyungjun
Issue Date
2015-07
Publisher
NATURE PUBLISHING GROUP
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 Mo1-x</inf>Wx</inf>S2</inf> alloy using sulfurization of super-cycle atomic layer deposition Mo1-x</inf>Wx</inf>Oy</inf>. Various spectroscopic and microscopic results indicate that the synthesized Mo1-x</inf>Wx</inf>S2</inf> 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</inf>Wx</inf>S2</inf> 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</inf>Wx</inf>S2</inf> multilayer has different vertical composition and broadband light absorption with strong interlayer coupling within a VCC Mo1-x</inf>Wx</inf>S2</inf> multilayer. Further, we demonstrate that a VCC Mo1-x</inf>Wx</inf>S2</inf> multilayer photodetector generates three to four times greater photocurrent than MoS2</inf>-and WS2</inf>-based devices, owing to the broadband light absorption. &#169; 2015 Macmillan Publishers Limited
URI
https://scholarworks.unist.ac.kr/handle/201301/16570
URL
http://www.nature.com/ncomms/2015/150723/ncomms8817/full/ncomms8817.html
DOI
10.1038/ncomms8817
ISSN
2041-1723
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MSE_Journal Papers
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