Characterization of MgO thin film prepared by spray pyrolysis technique using perfume atomizer
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Characterization of MgO thin film prepared by spray pyrolysis technique using perfume atomizer S. Visweswaran1 · R. Venkatachalapathy1 · M. Haris2 · R. Murugesan3 Received: 2 March 2020 / Accepted: 18 July 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Transparent conducting magnesium oxide (MgO) thin films are obtained by pyrolytic decomposition of magnesium acetate in a mixture of ethanol and distilled water on to a glass substrate using perfume atomizer. The substrate temperature (Ts) is maintained at 300 °C, 350 °C, 400 °C, and 450 °C for depositing the films and annealed at 450 °C for 4 h. Then the samples were characterized by X-ray diffraction, field emission scanning electron microscope, atomic force microscope, UV–Vis spectroscopy, photoluminescence analyzer, and Raman spectrophotometer for identifying its structure, morphology, topography, bandgap and defect states. The XRD result demonstrates the cubic, polycrystalline nature with (2 0 0) preferred orientation. The presence of MgO2 phase along (2 2 2) plane increases with substrate temperature is noticed. From the SEM monograph, the clusters of spherical grains are observed for all the films and the columnar growth of the MgO film is observed from the AFM topographical image. The surface roughness tends to increase with substrate temperature. The MgO thin films possess two absorption bands and two optical bandgaps. The transmittance of 70% is obtained for MgO film which could be used for optoelectronic device and protective coating applications. The blue and green emission bands are identified from the PL spectrum. The defects in the film are responsible for linear I–V characteristic and the large forward current value implies higher efficiency for solar cell applications.
1 Introduction Magnesium oxide (MgO) thin films have a significant role in optoelectronic devices, light-emitting diodes, piezoelectric devices, photodetectors, sensors and solar cells, plasma panels, smart and wearable devices, electrochromic device, wastewater treatment, drug delivery, and health care industry [1–8]. MgO is an ionic solid known as halite, in cubic rock salt form. It consists of two oxygen anion and metal cation interpenetrating the FCC sublattice [9]. Transparent conducting oxide (TCO) having high optical transparency and electrical conductivity is the advantage of MgO thin film. Its properties include wide bandgap energy (7.8 eV), dielectric constant (6.8), thermal conductivity (42 Wm−1K−1), * S. Visweswaran [email protected] 1
Department of Physics, Annamalai University, Annamalainagar, Chidambaram 608 002, India
2
Department of Physics, Karunya Institute of Technology and Sciences, Coimbatore 641 114, India
3
Department of Physics, Thiru Kolanjiappar Government Arts College, Vridhachalam 606001, India
hardness (5000 MPa), and elevated melting temperature [10]. In general, three types of vacancies are found for MgO identified as Fs, Fs+, F2+ s (color centers) depending on the number of electrons trapped fo
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