Electrical and Structural properties of Copper Oxide (CuO) Thin Films on Plastic Substrate Deposited by Spray Pyrolysis Technique

Mohammad G. Faraj; Askander K. Kaka; Halo D. Omar

doi:10.14500/aro.10558

Mohammad G. Faraj Department of Physics, Faculty of Science and Health, Koya University, Koya KOY45, Kurdistan Region http://orcid.org/0000-0001-9921-0208
Askander K. Kaka Department of Physics, Faculty of Science and Health, Koya University, Koya KOY45, Kurdistan Region http://orcid.org/0000-0003-1695-8822
Halo D. Omar Department of Physics, Faculty of Science and Health, Koya University, Koya KOY45, Kurdistan Region http://orcid.org/0000-0002-5888-5695

Keywords: Copper oxide, Chemical Spray Pyrolysis, Polyimide, This Film

Abstract

In this paper, copper oxide (CuO) thin films were deposited on polyimide plastic substrates by spray pyrolysis technique at different temperatures from 250 to 300°C. All the deposited films were characterized by X-ray diffraction (XRD) technique, ultraviolet (UV)-visible spectrophotometer, and hall effect measurements for the investigation of structural, optical, and electrical properties. The effects of substrate temperature on the structural, optical, and electrical properties of the films were studied. The XRD results revealed that all the CuO films have a facecentered cubic structure. The crystallite grain size was calculated using Scherrer formula and it was found that at the substrate temperature of 300°C, the CuO film presented maximum crystallite grain size of about 81.2 nm. The root mean square (RMS) roughness of the films was measured by scanning tunneling microscopy. RMS was increased with the rise of temperature. The optical transmission measurements by UV-visible spectrophotometer were used to determine the energy gap of the CuO films. Results showed that the optical energy gap has decreased with increasing the substrate temperature. Hall effect measurements showed that all the films are of p-type conductivity. Depending on the substrate temperature, hall measurement showed that the electrical resistivity and carrier concentration are varied from 77.4 Ω cm to 52.7 Ω cm and from 6.3 x10¹⁵ cm^-3 to 10.1 x10¹⁵ cm^-3., respectively.

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Author Biographies

Mohammad G. Faraj, Department of Physics, Faculty of Science and Health, Koya University, Koya KOY45, Kurdistan Region

Mohammad Ghaffar Faraj is an Assistant Professor at the Department of Physics, Koya University. He received his B.Sc. and M.Sc. degrees in physics, both from the University of Al-Mustansiryah, Iraq, in 2001 and 2004, respectively. He received his Ph.D. degree in solar energy from the School of Physics; University Sains Malaysia (USM), Malaysia, 2012. He completed Post-doctorate Fellow, Polymer Thin Film, in 2017 from University of Santiago de Compostela (USC), Spain. His research interests include solar cells, thin films, nanotechnology, polymers, and photodetectors Heterojunction.

Askander K. Kaka, Department of Physics, Faculty of Science and Health, Koya University, Koya KOY45, Kurdistan Region

Askander K. Kaka is a Lecturer at the Department of Physics, Faculty of Science and Health, Koya University. He got the B.Sc. degree in Al-Mustansiriya University, the M.Sc. degree in Al-Mustansiriya University and the Ph.D. degree at the University of Baghdad. His research interests are in Thin films, Nanostructures simulation and Antenna simulation. Dr. Askander is a member of Kurdistan Teachers Union.

Halo D. Omar, Department of Physics, Faculty of Science and Health, Koya University, Koya KOY45, Kurdistan Region

Halo D. Omar is a Lecturer at the Department of Physics, Faculty of Science and Health, Koya University. He got the M.Sc. degree in Material Physics from the University of Poitiers - France. His research interests are: Material Physics, Solar energy and Nanotechnology.

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