Investigation of electronic and optical properties of trilayer MoxW(1-x)S2 alloys with varying composition

Archishman Saha; Nivedita Pandey; Amitabha Nath; Subhananda Chakrabarti

doi:10.1117/12.3002920

12 March 2024 Investigation of electronic and optical properties of trilayer Mo_xW_(1-x)S₂ alloys with varying composition

Archishman Saha, Nivedita Pandey, Amitabha Nath, Subhananda Chakrabarti

Author Affiliations +

Proceedings Volume 12888, 2D Photonic Materials and Devices VII; 128880C (2024) https://doi.org/10.1117/12.3002920
Event: SPIE OPTO, 2024, San Francisco, California, United States

Conference Poster

Abstract

Transition metal dichalcogenides (TMDs) are widely utilized in spintronic and optoelectronic technologies due to their two-dimensional nature. In recent times, there has been a notable surge of interest in transition-metal disulfides, specifically molybdenum disulfide (MoS₂) and tungsten disulfide (WS₂), as exceptional materials for investigating fundamental physics in the realm of two-dimensional materials. The synthesis of Mo_xW_(1−x)S₂ alloys through experimental techniques has played a pivotal role in harnessing the unique properties of both MoS₂ and WS₂. Notably, trilayer TMDs exhibit properties such as tunable bandgap, higher exciton binding energy, and interlayer interaction, all of which contribute to the emergence of novel optical phenomena, including new optical modes and excitonic resonances. In this study, we investigate the potential of trilayer Mo_xW_(1−x)S₂ alloys using first-principle computational techniques. The analysis showed an indirect bandgap that ranged from approximately 1.34 to 1.39eV as the composition of the alloy varied from 74% Mo to 33% Mo. This tunability of the bandgap allows for precise control over the energy levels at which electronic transitions occur, enabling the material to adapt to specific device requirements. With an increasing percentage of tungsten (W) in the alloy, there was a pronounced peak shift in the out-of-plane absorption spectrum. The peak wavelength shifted from 1.95eV to 1.70eV, indicating that the material’s absorption properties could be tailored by adjusting the alloy composition. These findings open up possibilities for designing TMD-based photodetectors capable of detecting a wide range of light wavelengths.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Archishman Saha, Nivedita Pandey, Amitabha Nath, and Subhananda Chakrabarti "Investigation of electronic and optical properties of trilayer Mo_xW_(1-x)S₂ alloys with varying composition", Proc. SPIE 12888, 2D Photonic Materials and Devices VII, 128880C (12 March 2024); https://doi.org/10.1117/12.3002920

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