Abstract
Optical properties of the chalcogenides GeSe3, Sb2Se3, ZnSe, (GeSe3)80(Sb2Se3)20 and (GeSe3)70 (Sb2Se3)10(ZnSe)20 thin films are investigated. Incorporation of ZnSe into both GeSe3, Sb2Se3 results in amorphous (GeSe3)70(Sb2Se3)10(ZnSe)20 composition. The estimated optical energy gap, E g, is found to decrease from 3.06 eV for ZnSe to 1.81 eV for (GeSe3)70(Sb2Se3)10(ZnSe)20. While, the band tail width, E e, exhibits an opposite trend. The E g behaviour is believed to be associated with cohesive energy, CE, as the incorporation of ZnSe lowers its value. The calculated number of the excess of Se-Se homopolar bonds is found to affect mainly the E e values. The refractive index, n, is discussed in terms of Wemple-DiDomenico single oscillator dispersion model in the normal dispersion region. The oscillator energy, E o, and the dispersion energy, E d, are determined for films under investigation.
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References
Abdel-Aziz M M, El-Metwally E G, Fadel M, Labib H H and Afifi M A 2001 Thin Solid Films 386 99
Davis E A and Mott N F 1970 Philos. Mag. 22 903
Demiryont H, Thomposon L and Collins G 1986 Appl. Opt. 25 1311
Fouad S S 1995 Physica B215 213
Jenkins F A and White H E 1985 Fundamentals of optics (London: McGraw-Hill) p 479
Kumar G A, Thomas J, George N, Kumar B A, Radhakrishnan P, Nampoori V P N and Vallabhan C P G 2000 Phys. Chem. Glasses 41 89
Manifacier J C, Gasiot J and Fillarad J P 1976 J. Phys. E: Sci. Instrum. 9 1002
Mehra R M, Kumar R, Mathur P C and Shimakawa K 1988 Philos. Mag. B58 293
O’Reilly E P and Robertson J 1986 Phys. Rev. B34 8684
Olley J A 1973 Solid State Commun. 13 1437
Pamukchieva V, Szekeres A, Savova E and Vlaikova E 1998a J. Non-Cryst. Solids 242 110
Pamukchieva V, Levi Z and Savova E 1998b Semicond. Sci. Technol. 13 1309
Pauling L 1960 The nature of the chemical bond (Ithaca, NY: Cornell University Press)
Swanepoel R 1983 J. Phys. E: Sci. Intrum. 16 1214
Tauc J, Grigorovici R and Vancu A 1966 Phys. Status Solidi B15 627
Urbach F 1953 Phys. Rev. 92 1324
Vassilev V 2006 J. Univ. Chem. Technol. Metall. 41 257
Vassilev V S, Boycheva S V and Ivanova Z G 1998 J. Mater. Sci. Lett. 17 2007
Wemple S H 1973 Phys. Rev. B7 3767
Wemple S H and DiDomenico M 1971 Phys. Rev. B3 1338
Yamaguchi M 1985 Philos. Mag. B51 651
Zhang X, Ma H and Lucas J 2003 J. Optoelectron. Adv. Mater. 5 1327
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Balboul, M.R., Hosni, H.M., Soliman, M.A. et al. Effect of composition on optical properties of GeSe3-Sb2Se3-ZnSe thin films. Bull Mater Sci 37, 1255–1263 (2014). https://doi.org/10.1007/s12034-014-0070-x
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DOI: https://doi.org/10.1007/s12034-014-0070-x