Large-scale MoS2(1−x)Se2x monolayers synthesized by confined-space CVD. (7th June 2021)

• Record Type: Journal Article
• Authors: Zhang, Jinming; Qian, Yezheng; Nan, Haiyan; Gu, Xiaofeng; Xiao, Shaoqing
• Is Part Of: Nanotechnology. Volume 32:Number 35(2021)
• Publication Date: 2021-06-07
• Subjects: transition metal dichalcogenides -- alloy -- MoS2(1−x)Se2x -- chemical vapor deposition -- photodetectors; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/ac0026
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: Alloy engineering is efficient in modulating the electronic structure and physical and chemical properties of Transition metal dichalcogenides (TMDs). Here, we develop an efficient and simple confined-space CVD strategy by using a smaller quartz boat nested in a larger quartz boat for the preparation of ternary alloy MoS2(1− x ) Se2 x monolayers on SiO2 /Si substrates with controllable composition. The effect of hydrogen ratio of the mixed carrier gas (Ar/H2 ) on the resultant flakes are systematically investigated. A hydrogon ratio of 15% is demonstrated to be the most appropriate to synthesize large size (more than 400 μ m) single crystalline MoS2(1− x ) Se2 x alloy monolayers. The composition of the alloy can also be changed in a full range (2 x = 0–2) by changing the weight ratio of Se and S powder. The as-grown monolayer MoS2(1− x ) Se2 x alloys present continuously high crystal quality in terms of Raman and PL measurements. Furthermore, to visible light (532 nm), the MoS2(1− x ) Se2 x based photodetectors display wonderful photoresponse with a fast response of less than 50 ms. Our work may be usedful in directing the synthesis of TMDs alloys as well as their optoelectronic applications.