Vol. 105, Issue 6, June 2009, pp.119-126

Growth and Characterization of Nanocrystalline ZnO Thin Films by Spray Pyrolysis: Effect of Molarity of Precursor Solution

Dharmendra Mishra, K. C. Dubey, R. K. Shukla, Anchal Srivastava
and Atul Srivastava

Department of Physics, University of Lucknow, Lucknow (UP) India-226007

Tel.: +91-9839773193

E-mail: d_mishra01@rediffmail.com

Received: 21 February 2009   /Accepted: 22 June 2009   /Published: 30 June 2009

Abstract: Nanocrystalline ZnO thin films have been prepared by spray pyrolysis technique. Variation of structural, morphological, optical and electrical properties with molarity of the precursor solution is investigated in detail. XRD studies have shown that the films are polycrystalline in nature having hexagonal wurtzite structure with strong c-axis orientation which increases with increase in molarity of the precursor solution. Also the grain size increases from ~ 13.3 nm to 14.4 nm. SEM shows bead like structure scattered throughout the surface. The transmission study reveals a decrease in transmittance with an increase in molarity and the optical band gap lies in the range of ~ 3.25 eV to 3.27 eV for all the samples. The resistivity is found to be of the order of ~10^-2 Ωcm, carrier concentration is ~ 10¹⁶/ cm³ and hall mobility is ~ 4 cm²/Vs using Vander Pauw method. Sheet resistance is estimated to be ~ 10² Ω/Sq for the samples under investigation.

Keywords: Zinc oxide, Thin films, Spray pyrolysis, Nanocrystalline, Molarity

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