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

• DOI: 10.1038/ncomms8817
• Publication Date: 2015-07-23T12:36:35Z
• Authors: 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-...; Jusang Park; Hyunyong Choi; Hyungjun Kim
• Keywords: Molybdenum disulfide; Photocurrent; Tungsten disulfide; Ultraviolet; Visible spectrum

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 process Mo1-xWxS2 using sulfurization super-cycle atomic layer deposition Mo1-xWxOy. Various spectroscopic microscopic results indicate that the synthesized alloys have complete mixing Mo W atoms gap by systematically controlled composition number. Based this, synthesize vertically composition-controlled (VCC) multilayer five continuous super-cycles with different cycle ratios each super-cycle. Angle-resolved X-ray photoemission spectroscopy, Raman ultraviolet-visible spectrophotometer reveal VCC has vertical broadband light absorption strong interlayer coupling within multilayer. Further, demonstrate photodetector generates three to four times greater photocurrent than MoS2- WS2-based devices, owing absorption.