Effect of thickness of thin layer of ZnO produced by spray method on growth process and its structural and optical properties

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Abstract

ZnO thin films with different thicknesses between 46 nm and 317 nm are deposited on glass substrate by spray method. Morphology and roughness of surfaces are measured by SEM and AFM. AFM images and roughness of substrate showed that with increasing thickness, roughness has two different growth modes. With increasing thickness, roughness reduces and slow variation occurs from horizontal growth state which shows the substrate effect on growth process to vertical growth state which shows the layer effect on growth process. Optical properties are analyzed which varies as a function of thickness such as; transmission, energy gap, optical index, and extinction coefficient. Optical data showed that with increasing thickness, energy gap and transmission reduce and the average of transmission spectra in visible region is above 80%.

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References

[1]     N. Nithya and S. R. Radhakrishnan; “Effect of Thickness on the Properties ZnO Thin Films”; Advances in Applied Science Research 3, No. 6 (2012) 4041-4047.
[2]   T. P. Rao and M. C. Santhoshkumar; ” Effect of thickness on structural, optical and electrical properties of nanostructured ZnO thin films”; Applied Surface Science 255 (2009) 4579–4584.
[3]  B. Z. Dong, G. J. Fang, J. F. Wang, W. J. Guan, and X. Z. Zhao; ” Effect of thickness on structural, electrical, and optical properties of ZnO:Al films”; Journal of Applied Physics 101 (2007) 033713.
[4]   L. Xu, X. Li, Y. Chen, and F. Xu; “Structural and optical properties of ZnO thin films with different thickness”; Applied Surface Science 257 (2011) 4031–403.
[5]   G. A. Kumar, M. V. R. Reddy, and K. N. Reddy; ” Structural, Optical and Electrical Characteristics of Nanostructured ZnO Thin Films with various Thicknesses”; Res. J. Physical Sci. 1, No. 6 (2013) 17-23.
[6]   R. S. Reddy, A. Sreedhar, A. S. Reddy, and S. Uthanna; “Effect of film thickness on the structural morphological and optical properties of nanocrystalline ZnO films”; Adv. Mat. Lett. 3, No. 3 (2012) 239-245.
[7]   F. Chowdhury, S. M. F. Hasan, and M. S. Alam; “Morphological and optical properties of vacuum evaporated ZnO thin films”; Turk J. Phys. 36 (2012) 1 – 7.
[8]     M. Sharma and R. M. Mehra; “Effect of thickness on structural, electrical, optical and magnetic properties of Co and Al doped ZnO films”; Applied Surface Science 255 (2008) 2527–2532.
[9]    M. F. A. Alias, R. M. Aljarrah, H. KH. Al-Lamyand, and K. A. W. Adem; “Investigation the Effect of Thickness on the Structural and Optical Properties of Nano ZnO Films”; International Journal of Application or Innovation in Engineering & Management (IJAIEM) 2, No. 7 (2013) 198- 203.
[10]   G. X. Liang, P. Fan, and X. M. Cai; “The Influence of Film Thickness on the Transparency and Conductivity of Al-Doped ZnO Thin Films Fabricated”; Journal of Electronic Materials 40, No. 3 (2011) 267-273.
[11]   K. Kim, P. Ch. Debnath,” Effects of silver impurity on the structural, electrical, and optical properties of ZnO nanowires “, Nanoscale. Res. Lett. 6 (2011) 1-8.
[12]   X. Hao, J. Ma, D. Zhang, and T. Yang; Applied Surface Science 183 (2001) 137-142.
[13]   A. Jain, P. Sagar, and R. M. Mehra; “Changes of structural, optical and electrical properties ZnO films with their thickness”; Materials Science- Poland 25, No. 1 (2007) 233-242.

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History

  • Receive Date: 03 September 2012
  • Revise Date: 04 October 2012
  • Accept Date: 28 January 2013

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