The effects of Al doping on the optical constants of ZnO thin films prepared by spray pyrolysis method

  • Mujdat Caglar
  • Saliha Ilican
  • Yasemin Caglar
  • Fahrettin Yakuphanoglu
Article

Abstract

Aluminum doped ZnO (AZO) thin films doped with different aluminum concentrations have been prepared by spray pyrolysis method onto glass substrates. The optical and structural properties of the films have been investigated by X-ray diffraction and optical characterization methods. The X-ray diffraction spectra showed that all of the thin films are of polycrystalline nature. The thin films have (002) as the preferred orientation. The optical band gaps of the films were calculated. The Eg values decrease with increasing Al doping concentration. The refractive index, the extinction coefficient, and the real and imaginary components of dielectric constant are calculated. The obtained results show that all optical parameters keep constant in the visible region, whereas in the ultraviolet region, doping concentration strongly affects the optical parameters of AZO thin films. Optical constants tend to decrease with increasing doping concentration.

References

  1. 1.
    J.H. Lee, B.O. Park, Thin Solid Films 426, 94 (2003)CrossRefGoogle Scholar
  2. 2.
    H.-M. Zhou, D.-Q. Yi, Z.-M. Yu, L.-R. Xiao, J. Li, Thin Solid Films 515, 6909 (2007)CrossRefGoogle Scholar
  3. 3.
    D. Horwat, A. Billard, Thin Solid Films 515, 5444 (2007)CrossRefGoogle Scholar
  4. 4.
    D.R. Sahu, S.-Y. Lin, J.-L. Huang, Sol. Energy Mater. Sol. C. 91, 851 (2007)CrossRefGoogle Scholar
  5. 5.
    J.-H. Lee, J.-T. Song, Thin Solid Films, In Press, (2007)Google Scholar
  6. 6.
    K. Lin, P. Tsai, Mater. Sci. Eng. B-Solid 139, 81 (2007)CrossRefGoogle Scholar
  7. 7.
    W.F. Liu, J.M. Bian, L.Z. Hu, H.W. Liang, H.Q. Zang, J.C. Sun, Z.W. Zhao, A.M. Liu, G.T. Du, Solid State Commun. 142, 655 (2007)CrossRefGoogle Scholar
  8. 8.
    S.M. Rozati, Sh. Akesteh, Mater. Charact. 58, 319 (2007)CrossRefGoogle Scholar
  9. 9.
    H. Gómez, A. Maldonado, R. Castanedo-Pérez, G. Torres-Delgado, M. de la L. Olvera, Mater. Charact. 58, 708 (2007)CrossRefGoogle Scholar
  10. 10.
    A. Yavuz Oral, Z. Banu Bahsi, M. Hasan Aslan, Appl. Surf. Sci. 253, 4593 (2007)CrossRefGoogle Scholar
  11. 11.
    S.-Y. Kuo, W.-C. Chen, F.-I. Lai, C.-P. Cheng, H.-C. Kuo, S.-C. Wang, W.-F. Hsieh, J. Cryst. Growth 287, 78 (2006)CrossRefGoogle Scholar
  12. 12.
    X.-T. Hao, L.-W. Tan, K.-S. Ong, F. Zhu, J. Cryst. Growth 287, 44 (2006)CrossRefGoogle Scholar
  13. 13.
    Y. Caglar, S. Ilican, M. Caglar, F. Yakuphanoglu, Spectrochim. Acta A 67, 1113 (2007)CrossRefGoogle Scholar
  14. 14.
    J. Tauc, Amorphous and Liquid Semiconductors (Plenum Press, New York 1974)Google Scholar
  15. 15.
    M. Wang, K.E. Lee, S.H. Hahn, E.J. Kim, S. Kim, J.S. Chung, E.W. Shin, C. Park, Mater. Lett. 61, 1118 (2007)CrossRefGoogle Scholar
  16. 16.
    R.K. Shukla, A. Srivastava, A. Srivastava, K.C. Dubey, J. Cryst. Growth 294, 427 (2006)CrossRefGoogle Scholar
  17. 17.
    Y. Liu, L. Zhao, J. Lian, Vacuum 81, 18 (2006)CrossRefGoogle Scholar
  18. 18.
    S.W. Xue, X.T. Zu, W.G. Zheng, M.Y. Chen, X. Xiang, Physica B 382, 201 (2006)CrossRefGoogle Scholar
  19. 19.
    T. Minami, T. Kakumu, Y. Takeda, Thin Solid Films 290–291, 1 (1996)CrossRefGoogle Scholar
  20. 20.
    E. Burstein, Phys. Rev. 93, 632 (1954)CrossRefGoogle Scholar
  21. 21.
    K. Tominaga, H. Fukumoto, K. Kondou, Y. Hayashi, K. Murai, T. Moriga, I. Nakabayashi, Vacuum 74, 683 (2004)CrossRefGoogle Scholar
  22. 22.
    H. Gómez-Pozos, A. Maldonado, M. de la L. Olvera, Mater. Lett. 61, 1460 (2007)Google Scholar
  23. 23.
    A.K. Wolaton, T.S. Moss, Proc. R. Soc. A 81, 5091 (1963)Google Scholar
  24. 24.
    F. Abeles (ed.), Optical Properties of Solids (North-Holland, Publishing Company, London, UK, 1972)Google Scholar
  25. 25.
    S. Bandyopadhyay, G.K. Paul, S.K. Sen, Sol. Energy Mater. Sol. C. 71, 103 (2002)CrossRefGoogle Scholar
  26. 26.
    S.W. Xue, X.T. Zu, W.G. Zheng, H.X. Deng, X. Xiang, Physica B. 381, 209 (2006)CrossRefGoogle Scholar
  27. 27.
    J.N. Hodgson, Optical Absorption and Dispersion in Solids (Chapman and Hall LTD, 11 New fetter Lane London EC4, 1970)Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2007

Authors and Affiliations

  • Mujdat Caglar
    • 1
  • Saliha Ilican
    • 1
  • Yasemin Caglar
    • 1
  • Fahrettin Yakuphanoglu
    • 2
  1. 1.Faculty of Science, Department of PhysicsAnadolu UniversityEskisehirTurkey
  2. 2.Faculty of Arts and Sciences, Department of PhysicsFirat UniversityElazigTurkey

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