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Thickness dependent structural, optical, and electrical properties of ZnSe thin films

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Title Thickness dependent structural, optical, and electrical properties of ZnSe thin films
 
Creator Gupta, Tripti
Chauhan, R P
 
Subject ZnSe
Thin Films
Transmittance Spectra
Photoluminescence
Electrical Properties
 
Description 396-401
In present work, nanostructured films of ZnSe are synthesized on glass substrates by using electron beam vacuum
evaporation technique. To enhance the luminescence performance and electrical conductivity, the optimal film thickness are
investigated for which films of thickness 250 nm and 500 nm are grown on glass substrates. Additionally, films’ crystal
structures are also characterized. The XRD pattern revealed that the synthesized films exhibit preferred orientation of ZnSe
(111) lattice which exhibits polycrystalline state having cubic zinc blende structure. Various structural parameters such as their
crystallite sizes, strain developed in films, and their dislocation densities are also calculated. UV/VIS/NIR spectrophotometer
indicates that visible transmittance decreased while the infrared transmittance switching efficiency increased as the film
thickness increased from 250 nm to 500 nm. Moreover, the optical energy gaps of ZnSe films were in a range of 2.1-2.20 eV
which is comparatively smaller in comparison to their bulk counterparts revealing their confinement in nano-dimensions. The
study of their luminescence properties yields that the film of thickness 250 nm yield better results in blue spectral region which
is also illustrated through CIE plots. The reason could be that for smaller film thickness electrons can easily jump to excited
states for similar excitations owning to smaller crystallite sizes and thus showed greater luminescence. However, from the
analysis of its electrical characteristics, the enhanced electrical conductivity is captured for the films having thickness of 500
nm. Therefore, the enhanced blue emission in the optimized film thickness indicates that these films can be utilized as
luminescent materials.
 
Date 2023-08-16T12:09:03Z
2023-08-16T12:09:03Z
2023-08
 
Type Article
 
Identifier 0971-4588 (Print); 0975-1017 (Online)
http://nopr.niscpr.res.in/handle/123456789/62444
https://doi.org/10.56042/ijems.v30i3.3669
 
Language en
 
Publisher NIScPR-CSIR, India
 
Source IJEMS Vol.30(3) [June 2023]