STUDY THE EFFECT OF THICKNESS ON STRUCTURAL AND OPTICAL PROPERTIES OF ZNO THIN FILMS DOPED WITH 7% CADMIUM PREPARED BY CHEMICAL SPRAY PYROLYSIS METHOD

A. NAJEEM, JUBAIER; M. IRZEAJ, JAMAL

doi:10.37652/juaps.2012.77629

Document Type : Research Paper

Authors

University of Anbar - College of Science

10.37652/juaps.2012.77629

Abstract

ZnO thin films, pure and doped with cadmium in rate of (7%) and with thickness equal to (300,500,700) nm, have been prepared by using chemical spray pyrolysis technique on glass substrates with temperature about (375 ± 5 C). Using the solution of zinc acetate with (0.2 M), the ZnO films doped with Cd have been obtained from the addition of cadmium acetate to zinc acetate with (0.2M) too. Structural and optical properties of the thin films above have been studied; XRD measurements demonstrated that the pure ZnO and (ZnO:Cd) films are polycrystalline with (100) orientation and with Hexagonal Wurtzite structure. Furthermore ,crystallized of films increasing with increase of thickness. The optical properties were studied using the spectral of the absorbance and transmission of films in wavelength ranging (300-800) nm. The study showed that the films have high transmission within the range of the visible spectrum and decrease with increase thickness and doping with cadmium, In addition changing in edge of absorbance to high wavelengths, which confirms the decrease in the values for the energy gap. Also absorption coefficient and coefficient of extinction was calculated and found to be changed with thickness changing

Main Subjects

Physics

References

[1] R.W. Berry and P.M.Hall,^"Thin Films Technology^", New York (1979).

[2] K. L. Chopra, "Thin Films Phenomena " Mc. Graw-Hill book Company. New York. (1969).

[3]A.K.Abass,"SolarEnergyMaterials",Vol.10,(1988).

[4]bS.Shanthi,C.Subramanian,P.Ramasamy,Cryst.Res.Technol.,Vol.34, P.1037,(1999).

[5]E.Elangovan,K.Ramesh,K.Ramamurthi,SolidStateCommunication,Vol.130,P. 523, (2004).

[6] T. Minami, H. Nanto S.Shooji and S. Takata "Thin Solid Films" vol.111, (1984).

[7] X. Li, S.E. Asher, B.M. Keyes, and T.J. Coutts, "p-Type ZnO Thin Films Grown by MOCVD", NREL/CP-520-37378, (2005).

[8] L.A. Patil, A.R. Bari, M.D. Shinde, Vinita Deo, " Ultrasonically prepared nanocrystalline ZnO thin films for highly sensitive LPG sensing", Sensors and Actuators B 149, pp.79–86, (2010).

[9] Guillermo Santana, " Structural and optical properties of (ZnO)x (CdO)1-x thin films obtained by spray pyrolysis ", Thin Solid Films, 373,pp. 235-238, (2000).

[10] G.T.Delgadoetal," Percolation Mechanism and Characterization of (CdO)y(ZnO)l-y Thin Films", Adv. Funcl. Mater. 12. No. 2, (2002).

[11] Gang Li." Doping and annealing effects on ZnO:Cd thin films by sol–gel method", J. of Alloys and Compounds, 509,pp. 4816–4823, (2011).

[12] J.I.Pankove," Optical processes in semiconductors " by prentice –Hall, Inc., 1971.

[13] L.E, chertora " Physics of thinfilm", Ludmia Eckertora, 1983.

[14] S. S. Al-Rawi,S. J. Shakir & Y. Hasan," Solid State physics", Al-Mousl University, (Arabic Version), (1988).

[15] V. Sanap, "Fabrication & Characterization of Nanostructured Zinc Oxide Thin Films", Jo. Of Ovonic Research, Vol. 7, No. 4, pp. 67-72, (2011).

[16] M.H.Brodsky"Amorphous Semiconductors " Cambridge Univ. Press, New York ( 1978 ).

[17] D. Zhang, F. Zeng," Visible light-activated cadmium-doped ZnO nanostructured photocatalyst for the treatment of methylene blue dye ", J Mater Sci, vol.47, pp.2155–2161, (2012).

[18] Fahrettin Yakuphanoglua, " Microstructure and electro-optical properties of sol_gel derived Cd-doped ZnO films", Superlattices and Microstructures, Vol. 47, pp. 732_743, (2010).

[19] J.Z. Liu." Controllable synthesis of undoped/Cd-doped ZnO nanostructures", Materials Letters 60, pp.3122-3125,(2006).

[20] S. S. Shariffudin et al, " Effect of Film Thickness on Structural, Electrical, and Optical Properties of Sol-Gel Deposited Layer-by-layer ZnO Nanoparticles", Transactions on Electrical and Electronic Materials, Vol. 13, No. 2, pp. 102-105, ( 2012).

[21] Preetam Singh et al., "In situ high temperature XRD studies of ZnO Nano powder prepared via cost effective ultrasonic mist chemical vapour deposition", Bull. Mater. Sci., Vol. 31, No. 3,, pp. 573–577, ( 2008).

[22] M. Tortosa, M. Mollar, B. Mar, "Synthesis of ZnCdO thin films by electro deposition", Journal of Crystal Growth, Vol.304, pp. 97–102, (2007).

[23] Farzana Chowdhury, "Influence of Thickness Variation on The Optical Properties of ZnO Thin Films Prepared by Thermal Evaporation Method", J. of Electron Devices, Vol. 10, pp. 448-455, (2011).

[24] Fahrettin Yakuphanoglua, " Microstructure and electro-optical properties of sol- gel derived Cd-doped ZnO films", Superlattices and Microstructures, Vol. 47, pp. 732_743, (2010).

[25] S.Ilican, "photovoltaic solar cell properties of Cd_xZn_1-xO films prepared by sol-gel method", inter nat.j.of Hyd.Ene., vol.34, pp.5201-5207, (2009).

[26] Y. Ganesan, "Preparation and Characterization of Doped Zinc Oxide", Msc. Thesis in materials science and engineering, The University of Texas, (2006).

[27] M. H. Hassuni, Msc.Thesis in Physics, in arabic, Al- Mustansiriyah university, (2003).

[28] A.S.Jabar,"A study of some physical properties of cadmium thin films deposit by Glow Discharge Sputtering ", Master in Material Science in Arabic, University of Technology, (2006).

Journal of University of Anbar for Pure Science

STUDY THE EFFECT OF THICKNESS ON STRUCTURAL AND OPTICAL PROPERTIES OF ZNO THIN FILMS DOPED WITH 7% CADMIUM PREPARED BY CHEMICAL SPRAY PYROLYSIS METHOD

References

References

Volume 6, Issue 3
December 2012
Page 138-145

STUDY THE EFFECT OF THICKNESS ON STRUCTURAL AND OPTICAL PROPERTIES OF ZNO THIN FILMS DOPED WITH 7% CADMIUM PREPARED BY CHEMICAL SPRAY PYROLYSIS METHOD

References

References

Volume 6, Issue 3December 2012Page 138-145

Volume 6, Issue 3
December 2012
Page 138-145