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Influence of substrate temperature on the morphological, structural, optical and electrical properties of nanostructured CuO thin films synthesized by spray pyrolysis technique

P. DATTA1,2, M. SHARMIN3, J. PODDER3,* , S. CHOUDHURY1

Affiliation

  1. Department of Physics, University of Dhaka, Dhaka-1000, Bangladesh
  2. Nuclear Power Plant Company Bangladesh Limited, Rooppur NPP Bhaban, Dhaka-1000, Bangladesh
  3. Department of Physics, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh

Abstract

Nanostructured copper oxide (CuO) thin films have been synthesized onto the glass substrates from aqueous solutions of copper (II) acetate monohydrate precursor salt by a cost effective spray pyrolysis technique at various substrate temperatures between 473 and 673 K. The effects of varying substrate temperature on the structure, surface morphology, optical and electrical properties of the synthesized CuO thin films were studied. Scanning Electron Microscopic (SEM) images revealed agglomerated nanoparticles on the surface of CuO thin films. X-Ray Diffraction (XRD) analysis revealed monoclinic structure with the predominant (̅111) orientation of the synthesized films. Crystallite size increased (9.15 to 10.29 nm) with the increase of substrate temperature. In UV-vis-NIR spectroscopy, CuO thin films showed higher transparency in the NIR region. An optical band gap of CuO thin film was found in the range of 2.04 - 2.49 eV. Transmittance and band gap decreased with the increase of substrate temperature up to 573 K and found to increase at 673 K. On the other hand, extinction coefficient and refractive index increased with the increase of substrate temperature up to 573 K and decreased afterwards. Electrical resistivity of CuO thin films was found in the range 1.16 ×103 - 4.61 ×103 Ω-m and decreased with the increment of the substrate temperature up to 573 K. Activation energies of CuO thin film were found in the range 0.08 - 0.57 eV. Hence, we report the influence of substrate temperature for the synthesis of nanostructured CuO thin films, best fit for optoelectronic applications..

Keywords

Spray pyrolysis, CuO, SEM, XRD, Band gap, Activation energy.

Submitted at: June 3, 2020
Accepted at: Feb. 15, 2021

Citation

P. DATTA, M. SHARMIN, J. PODDER, S. CHOUDHURY, Influence of substrate temperature on the morphological, structural, optical and electrical properties of nanostructured CuO thin films synthesized by spray pyrolysis technique, Journal of Optoelectronics and Advanced Materials Vol. 23, Iss. 1-2, pp. 35-42 (2021)