Cookies ussage consent
Our site saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing our site without changing the browser settings you grant us permission to store that information on your device.I agree, do not show this message again.
NEHA SHARMA1, BALBIR SINGH PATIAL2,* , PANKAJ SHARMA3, NAGESH THAKUR1
- Department of Physics, H.P. University Summer Hill Shimla, H.P.-171 005 India
- State Project Directorate, Rashtriya Uchchatar Shiksha Abhiyan (RUSA), Directorate of Higher Education, Shimla, (H.P.) 171001 India
- Department of Physics, Jaypee University of Information Technology, Waknaghat, H.P.-173215, India
In the present study, chalcogenide thin films for different compositions (Se80Te20)94-xGe6Pbx (x = 0, 2, 4 and 6) were prepared by thermal evaporation technique. Optical transmission spectra were taken in the wavelength ranges from 500- 2600 nm. By using the maxima and minima of the interference fringes, optical constants and thickness of the films were derived. Dispersion of refractive index was analyzed using the single-oscillator Wemple and DiDomenico model. Optical band gap (Eg) for non-direct transition was estimated by the Tauc relation. Eg was found to decrease with the increase in lead content. It was found that with the increase in lead concentration, the refractive index (n), absorption coefficient (), extinction coefficient (k), optical conductivity (σ), real (r) and imaginary part (i) of dielectric constant increases. We also compared the value of static refractive index (n0) obtained by WDD (Wemple and DiDomenico) model and by Cauchy's dispersion relation, found that these two values were not in consonance to each other..
Thin films, Optical constants, Nano-chalcogenide.
Submitted at: Nov. 26, 2017
Accepted at: Aug. 9, 2018
NEHA SHARMA, BALBIR SINGH PATIAL, PANKAJ SHARMA, NAGESH THAKUR, On the optical study of Pb additive Se-Te-Ge nanocrystalline quaternary alloys, Journal of Optoelectronics and Advanced Materials Vol. 20, Iss. 7-8, pp. 435-440 (2018)
- Download Fulltext
- Downloads: 84 (from 54 distinct Internet Addresses ).