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 Myung, Christian Dussarrat, Clement Lansalot-Matras, Jusang Park, Hyunyong Choi, Hyungjun Kim

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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.
Original languageEnglish
Article number7817
JournalNature Communications
Publication statusPublished - 2015 Jul 23

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    Song, J. G., Ryu, G. H., Lee, S. J., Sim, S., Lee, C. W., Choi, T., Jung, H., Kim, Y., Lee, Z., Myung, J. M., Dussarrat, C., Lansalot-Matras, C., Park, J., Choi, H., & Kim, H. (2015). Controllable synthesis of molybdenum tungsten disulfide alloy for vertically composition-controlled multilayer. Nature Communications, [7817].