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Electronic, Optical and Thermoelectric Properties of WSe2(8,0) and WSeS(8,0) Nanotubes

Document Type : Research

Authors

1 Department of Physics, Karaj Branch, Islamic Azad University, Karaj, iran

2 Department of Physics, Kermanshah Branch, Islamic Azad University, Kermanshah, Iran.

3 Department of physics, Karaj Branch,Islamic Azad University, Karaj, Iran

Abstract

Based on density functional theory calculations, the electronic, optical and thermoelectric properties of WSe2(8,0) and WSeS(8,0) nanotubes have been investigated. The WSe2(8,0) nanotube has 0.2eV energy gap, and this gap is reduced by adding a Se atom to it. The band structure shows that the WSe2(8,0) nanotube is p-type semiconductor and WSeS(8,0) compound is n-type. The imaginary part of the dielectric function shows that these two structures have main response to the light in the infrared region and have small optical gaps, while the optical energy loss functions have the lowest values in this energy region. At a temperature of 200 K, the figure of merit coefficient of the WSeS(8,0) nanotube is larger than WSe2(8,0) one, but at high temperatures, the power factor coefficient of the WSe2(8,0) nanotube is higher, which shows that this case is suitable for power generators.

Keywords

References
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Quarterly Journal of Optoelectronic
Volume 7, Issue 3 - Serial Number 20
April 2025
Pages 9-20
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