Regular Article - Solid State and Materials
Growth optimization and DFT investigation of doping effect on properties of VS2 monolayer crystals
Department of Electronics and Communications Engineering, National Institute of Technology Karnataka, Surathkal, 575025, Mangalore, India
2 Department of Electrical Engineering, Indian Institute of Technology Indore, 453552, Indore, Madhya Pradesh, India
3 Department of Electrical Engineering, Shiv Nadar University, 201314, G.B. Nagar, Uttar Pradesh, India
4 Department of Electronics and Communication Engineering, Manipal University Jaipur, 303007, Jaipur, Rajasthan, India
5 Department of Electronics Engineering, Sardar Vallabhbhai National Institute of Technology Surat, 395007, Surat, India
6 Centre for Advanced Electronics (CAE), Indian Institute of Technology Indore, 453552, Indore, Madhya Pradesh, India
7 School of Engineering, RMIT University, 3001, Melbourne, VIC, Australia
Accepted: 30 March 2023
Published online: 17 April 2023
The vanadium disulfide (VS2) material, a prominent member of the two-dimensional materials family, has great potential to bridge the performance gap between current performance and contemporary energy storage device needs. Here, we report the optimization of the growth temperature of VS2 monolayer crystals using a chemical vapor deposition system. It is also found the crystal size increases with the increase of growth temperature up to 770 °C. Further increasing of growth temperature resulted in a reduction of crystal size. The atomic force microscopy measurement demonstrated the growth of monolayer thick VS2 crystal. Raman spectra revealed the formation of H-phase monolayer high-quality VS2 crystals. To understand the precise impact of doping on electronic properties, the substitutional doping of VS2 monolayer with chromium, molybdenum, and tungsten was also examined using density functional theory. The VS2 monolayer exhibits an indirect energy band gap that decreases after chromium doping of the VS2 lattice and vanishes after molybdenum and tungsten doping. Finally, it is found that tungsten-doped VS2 monolayer exhibits strong metallic character and other exceptional properties, making it suitable for electrodes of various energy storage devices.
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