EFFECT OF OXIDATION TIME ON STRUCTURAL AND OPTICAL PROPERTIES OF ZNO FILMS PREPARED BY HYDROTHERMAL OXIDATION OF ELECTRODEPOSITED ZN COATING ON ITO SUBSTRATE

Shakil Khan, Muhammad Iftikhar, Hafiz Waseem Ahmad Alvi, Muhammad Asim Rasheed, Abdul Faheem Khan, Abdul Waheed, Mazhar Mehmood, Attaullah Shah and Arshad Mahmood
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Shakil Khan: Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 45650, Pakistan
Muhammad Iftikhar: Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 45650, Pakistan
Hafiz Waseem Ahmad Alvi: Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 45650, Pakistan
Muhammad Asim Rasheed: #x2020;Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 45650, Pakistan
Abdul Faheem Khan: #x2021;Department of Materials, Science & Engineering, Institute of Space Technology, Islamabad 44000, Pakistan
Abdul Waheed: #xA7;Department of Physics, Islamia College, Peshawar 25120, Pakistan
Mazhar Mehmood: Department of Metallurgy and Materials Engineering, Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad 45650, Pakistan
Attaullah Shah: #xB6;National Institute of Laser and Optronics College (NILOP-C), PIEAS, Islamabad 45650, Pakistan
Arshad Mahmood: #xB6;National Institute of Laser and Optronics College (NILOP-C), PIEAS, Islamabad 45650, Pakistan

Surface Review and Letters (SRL), 2020, vol. 27, issue 10, 1-7

Abstract: In this work, hydrothermal oxidation of electrodeposited zinc coatings is used to produce zinc oxide (ZnO) films. In the first step, zinc (Zn) coating is electrodeposited on indium tin oxide (ITO) coated glass substrate. The Zn films are then immersed in deionized water at 95∘C. The exposure time of Zn coating in deionized water is varied from 1h to 24h in sequence. At the 24h exposure time, X-ray diffraction (XRD) patterns reveal that zinc film has been completely converted to ZnO. Scanning electron microscope (SEM) results show morphological changes from flakes (for pure Zn) or 2D plates to rod (ZnO) like morphology which further changes to cotton-flower like shapes with an increase in oxidation time. Diffuse reflectance spectral measurements show the band gap tuning with oxidation time (it decreases from 3.28eV to 3.19eV). Photoluminescence (PL) spectra have depicted phonon replicas with energy separation of ∼124meV for the ZnO films obtained after 6 and 12h exposure time in deionized water at 95∘C temperature.

Keywords: ZnO films; hydrothermal oxidation; XRD; diffuse reflectance; photoluminescence (search for similar items in EconPapers)
Date: 2020
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DOI: 10.1142/S0218625X19502275

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