Optical characterization of tin containing novel chalcogen rich glassy semiconductors
- 48 Downloads
Amorphous thin film materials with different compositions of Se80−xTe20Snx (0 ≤ x ≤ 10) system have been deposited on glass substrates by a well known thermal evaporation technique. Structural characterization of different compositions of aforementioned system has been done by Raman spectroscopy. The optical properties of thin films have been studied in the wavelength range 200–1100 nm by the utilization of the optical absorbance spectra of deposited thin films. To calculate the optical band gap from the optical absorption spectra, we have used Tauc model that follows the mechanism of allowed ‘non-direct electronic transition’. Subsequently, we have determined the energy band gap, metallization criterion and refractive index of thin films of aforesaid system. The variation in optical properties with composition has been interpreted in terms of density of defect states.
KeywordsAmorphous thin films Optical absorbance Optical band gap Extinction coefficient Metallization
NM is thankful to his university for providing grant under the consumable head of DST-Purse programme-(5050). AKS is thankful to CSIR, New Delhi, India for providing financial support. We are also thankful to Department of Metallurgy, IIT BHU, Varanasi for providing SEM facility.
- Aggarwal, I.D., Sanghera, J.S.: Development and applications of chalcogenide glass optical fibers at NRL. J. Optoelectron. Adv. Mater. 4, 665–678 (2002)Google Scholar
- Mehta, N.: Applications of chalcogenide glasses in electronics and optoelectronics: a review. J. Sci. Ind. Res. 65, 777–786 (2006)Google Scholar
- Morquez, E., Wagner, T., Gonzalez-Leal, J.M., Bernal-Olive, A.M., Prieto-Aleon, R., Jimenez-Garay, R., Ewen, P.J.S.: Controlling the optical constants of thermally-evaporated Ge10Sb30S60 chalcogenide glass films by photodoping with silver. J. Non-Cryst. Solids 274, 62–68 (2000)ADSCrossRefGoogle Scholar
- Mott,N.F., Davis, E.A.: Electronic processes in non-crystalline materials. Clarendon Press, Oxford university, pp 273–300 (1971). Work ID: 9122384Google Scholar
- Sanghera, J.S., Shaw, L.B., Busse, L.E., Nguyen, V.Q., Pureza, P.C., Cole, B.C., Harbison, B.B., Aggarwal, I.D., Mossadegh, R., Kung, F., Talley, D., Roselle, D., Miklos, R.: Development and infrared applications of chalcogenide glass optical fibers. Fiber Integr. Opt. 19, 251–274 (2000)ADSCrossRefGoogle Scholar
- Saraswat, V.K., Kishore, V., Deepika, K.S., Saxena, N.S., Sharma, T.P.: Band gap studies on Se–Te–Sn ternary glassy films. Chalcogenide Lett. 4, 61–64 (2007)Google Scholar
- Sharma, K., Lal, M., Goyal, N.: Optical properties of amorphous Se80-xTe20Bix thin films. J. Opto. Bio. Mat. 6, 27–34 (2014)Google Scholar
- Tauc, J.: The Optical Properties of Solids. North-Holland, Amsterdam (1970)Google Scholar
- Tauc, J.: Optical Properties of Amorphous Semiconductors, pp. 159–220. Plenum, New York (1974a)Google Scholar
- Zavetova, M., Velicky, B.: Optical Properties of Solids New Developments Edited by B. O. Seraphin, p. 379. North-Holland, Amsterdam (1976)Google Scholar
- XXXXGoogle Scholar