Synthesis and study of reflectance and transmittance of a transparent conducting oxide: Niobium (Nb) doped Titanium dioxide (TiO2) at different doping concentrations

R. K. Das¹

1. Dept. of Physics, Charuchandra College, University of Calcutta, Kolkata, India.

Correspondence should be addressed to: rkdas_171171@rediffmail.com.

Section:Research Paper, Product Type: Isroset-Journal
Vol.6 , Issue.1 , pp.27-31, Feb-2018

CrossRef-DOI:   https://doi.org/10.26438/ijsrpas/v6i1.2731

Online published on Feb 28, 2018

Copyright © R. K. Das . This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
 

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Abstract :
In this paper we have successfully prepared the Niobium (Nb) doped Titanium dioxide (TiO2) thin film with different Nb doping concentration. There are many methods for the synthesis of Nb doped TiO2 thin films such as sputtering, pulsed laser deposition, chemical vapour deposition, sprays pyrolysis and sol-gel methods. But here Nb doped TiO2 thin films were coated on glass substrate by sol-gel spin coating technique. Diffused reflectance and transmittance has been studied with different doping concentration. We have measured diffuse reflectance of Nb doped TiO2 thin films by taking different Nb concentrations with the help of Diffuse Reflectance Spectrometer (DRS). It is clear there are differences in the position of the absorption edge. It is observed that the total reflectance for Nb doped TiO2 thin film changes with increasing the Nb concentration. The experimental results indicated that the optimum concentration is 5wt. % and can be used to obtain Nb doped TiO2 thin films with a very high transmittance (88.5 %). We observed different absorption edge at different wavelength which depends on the doping concentrations. The samples showed a better transmittance in the visible region and a sharp fall in the UV region. The increase of the surface roughness leading to decrease of the peak values.

Key-Words / Index Term :
Doping, Reflectance, Transmittance, thin films, Sol-Gel method

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