Synthesis of millimeter-sized Mo x W (1− x ) S 2 y Se 2(1− y ) monolayer alloys with adjustable optical and electrical properties and their magnetic doping

Li, You; Wang, Yiwen; Hussain, Sabir; Xie, Liming; Qi, Junjie

Synthesis of millimeter-sized Mo x W (1− x ) S 2 y Se 2(1− y ) monolayer alloys with adjustable optical and electrical properties and their magnetic doping

Files

2023-SynthesisofMillimeterSizedMoxW(1-x)S2ySe2(1-y).pdf(2.63 MB)

Accepted version

d3tc03332e.pdf(6.19 MB)

Supplementary information

Date

2023-11-21

Authors

Li, You

Wang, Yiwen

Hussain, Sabir

Xie, Liming

Qi, Junjie

Publisher

Royal Society of Chemistry

Published Version

https://doi.org/10.1039/D3TC03332E

Abstract

Alloying has emerged as an effective approach for elec/optoelectronics applications by modulating the bandgap engineering of two-dimensional (2D) transition metal dichalcogenides (TMDs). Based on our earlier liquid phase edge epitaxy (LPEE) method, we have grown millimeter-sized quaternary MoxW(1-x)S2ySe2(1-y) monolayer films and MoxW(1-x)S2ySe2(1-y) monolayers with different morphologies by controlling the growth temperature and time. The homogeneity and good crystallinity of as-grown alloys are demonstrated by energy-dispersive spectroscopy (EDS), elemental mapping, Raman mapping, and high-resolution transmission electron microscopy (HRTEM). Atomic-resolution scanning transmission electron microscopy (STEM) strongly demonstrates the uniform distribution of Mo, W, S, and Se. Furthermore, alloy-based field-effect transistors (FETs) displaying bipolar conduction behavior with a weak p-branch and conduction behavior show component-dependent properties. In addition, this strategy has been broadened to prepare M-doped MoxW(1-x)S2ySe2(1-y) monolayers (M: Fe, Co, and Ni) for the first time, where magnetic hysteresis (M-H) measurements indicated room temperature ferromagnetism of MoxW(1-x)S2ySe2(1-y). Therefore, the synthesized pristine and M-doped alloys have greatly enriched the family of 2D materials and are prospective candidates for applications in future industrial device applications.

Keywords

Monolayers , Crystallinity , Energy dispersive spectroscopy , Field effect transistors , High resolution transmission electron microscopy , Mapping , Scanning electron microscopy , Semiconductor doping , Transition metals

Citation

Li, Y., Wang, Y., Hussain, S., Xie, L. and Qi, J. (2023) ‘Synthesis of millimeter-sized Mo x W (1− x ) S 2 y Se 2(1− y ) monolayer alloys with adjustable optical and electrical properties and their magnetic doping’, Journal of Materials Chemistry C, 11(48), pp. 16912–16921. Available at: https://doi.org/10.1039/D3TC03332E.