Modulating the Excitonic Emission from WS2 Nanostructures by Manipulating the Intrinsic Structural Defects and Extrinsic Impurity Defects

The Transition Metal Dichalcogenide (TMD), WS 2 , is a semiconducting 2D material with promising applications in optoelectronics and spintronics. Two strongly pronounced resonances, A and B excitons, are the main characteristics of the optical spectra of TMDs. The application of 2D TMD material in p...

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Bibliographic Details
Published in2023 8th International Conference on Computers and Devices for Communication (CODEC) pp. 1 - 2
Main Authors Bhatt, Prarbdh, Halder, Nilanjan
Format Conference Proceeding
LanguageEnglish
Published IEEE 14.12.2023
Subjects
Excitons
Impurities
Nanostructures
Sociology
Stimulated emission
Transition metal dichalcogenides
Vanadium
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Summary:The Transition Metal Dichalcogenide (TMD), WS 2 , is a semiconducting 2D material with promising applications in optoelectronics and spintronics. Two strongly pronounced resonances, A and B excitons, are the main characteristics of the optical spectra of TMDs. The application of 2D TMD material in photonics is largely rooted in its potential to enable capabilities for engineering their exciton dynamics. In this paper, we discussed modulating the population ratio of A and B excitons in hydrothermally synthesized WS 2 by manipulating the intrinsic structural defects and extrinsic impurity defects. Post-synthesis processing, like mild annealing, was employed to control the intrinsic structural defects of the TMD material, which ct as non-radiative channels for exciton relaxation. Further, substitutional doping with a p-type impurity (Vanadium) was employed to increase the free hole density in the valence band, thereby affecting the exciton emission.
DOI:10.1109/CODEC60112.2023.10465882