Main Article Content
Spray pyrolysis technique (SPT) is employed to synthesize cadmium oxide nanostructure with 3% and 5% Cobalt concentrations. Films are deposited on a glass substrate at 350 ᵒC with 150 nm thickness. The XRD analysis revealed a polycrystalline nature with cubic structure and (111) preferred orientation. Structural parameters represent lattice spacing, crystallite size, lattice parameter and dislocation density. Homogeneous surfaces and regular distribution of atoms were showed by atomic force microscope (AFM) with 1.03 nm average roughness and 1.22 nm root mean square roughness. Optical properties illustrated a high transmittance more than 85% in the range of visible spectrum and decreased with Co concentration increasing. The absorption coefficient values decreased with increasing wavelength and the prepared films had absorption coefficient values greater than 104 cm-1. The optical energy gap values for allowing direct transition (ADT) varied from 2.78 to 2.63 eV with increasing Co concentration, while the energy gap for allowing indirect transition (AIDT) varied from 1.85 to 1.6 eV with Co concentration.
Received 25/10/2019, Accepted 10/6/2020, Published Online First 11/1/2021
This work is licensed under a Creative Commons Attribution 4.0 International License.
Benhamida S, Benhaoua B, Barir R, Rahal A, Benhaoua A. Effect of sprayed solution volume on structural and optical properties of nickel oxide thin films. J Nano- Electron Phys. 2017; 9(3):1–5.
Maragatham V, Sushmitha V, Deepak Raj P, Sridharan M. Studies on sputtered ZnO:CdO thin films for TCO application. IOP Conf Ser Mater Sci Eng. 2018; 310(1):1–6.
Martin EJJ, Yan M, Lane M, Ireland J, Kannewurf CR, Chang RPH. Properties of multilayer transparent conducting oxide films. Thin solid Film. 2004; 461(2):309–15.
Jeong W J, Park G C. Electrical and optical properties of ZnO thin film as a function of deposition parameters. Sol Energ Mat Sol C. 2001; 65(1):37–45.
Stadler A. Transparent Conducting Oxides—An Up-To-Date Overview. Materials (Basel). 2012; 5(12):661–83.
Edwards PP, Porch A, Jones MO, Morgan D V, Perks RM. Basic materials physics of transparent conducting oxides. Dalton Trans. 2004 ;( 19):2995–3002.
Chopra KL, Major S, Pandya DK. Transparent conductors-A status review. Thin Solid Films. 1983; 102(1):1–46.
Kawazoe H, Ueda K. Transparent Conducting Oxides Based on the Spinel Structure. J Am Ceram Soc. 2004; 82(12):3330–6.
Soonmin H. Synthesis and Properties of Cadmium Oxide Thin Films: a Review. Int J Curr Adv Res. 2016;5(7):3–7.
Kavitha B, Nirmala M, Poornachandra S, Pavithra M. Preparation and Characterization of CdO Thin Films Prepared by Chemical Method. J Environ Nanotechnol. 2017; 6(1):59–66.
Das MR, Mukherjee A, Mitra P. Structural, optical and electrical characterization of CBD synthesized CdO thin films: Influence of deposition time. Mater Sci-Poland. 2017; 35(3):470–8.
Shehab AA, Mahmoud T H. Study the Influence of Sn Dopant on the Some Structural and Optical Properties of Pure Cadmium Oxide (CdO) Thin Films. Ibn Al-Haitham J Pure Appl Sci. 2012; 25(2):170–82.
Dhivya P, Prasad AK, Sridharan M. Nanostructured cadmium oxide thin films for hydrogen sensor. Int J Hydrog Energ. 2012; 37(23):18575–8.
Uplane MD, Kshirsagar PN, Lokhande BJ, Lokhande CD. Preparation of cadmium oxide films by spray pyrolysis and its conversion into cadmium chalcogenide films. Indian J Pure Ap Phy. 1999; 37(8):616–9.
Quiñones-Galván JG, Lozada-Morales R, Jiménez-Sandoval S, Camps E, Castrejón-Sánchez VH, Campos-González E, et al. Physical properties of a non-transparent cadmium oxide thick film deposited at low fluence by pulsed laser deposition. Mater Res Bull. 2016; 76:376–83.
Ghdeeb N J. Effect of Molara Concentration on Structural, Morphological and Optical Properties of CdO Thin Films Prepared by Chemical Spray Pyrolysis Methode. Int J Sci Res. 2017; 6(2):1351–4.
Zhang J. Room-temperature compressibilities of MnO and CdO: further examination of the role of cation type in bulk modulus systematics. Phys Chem Miner. 1999; 26(8):644–8.
Kathalingam A, Kesavan K, Sarwar H, Jeon J, Kim H. Analysis of Sn Concentration Effect on Morphological, Optical, Electrical and Photonic Properties of Spray-Coated Sn-Doped CdO Thin Films. Coating. 2018; 8(167):1–15.
Ismail RA, Ghafori S, Sichat RS. Characteristics study of nanostructured CdO prepared by spray pyrolysis. Int Lett Chem Phys Astron. 2015; 53:165–72.
Mahasen MM, Soraya MM, Yousef EL S, GOMAA A M, Shaaban ER. Structural, thermal and optical analyses of cobalt-doped cdo thin films. J Ovonic Res. 2019; 15(4):247–60.
Badera N, Godbole B, Srivastava SB, Vishwakarma PN, Deepti J, sharath L S, et al. Photoconductivity of Cobalt doped CdS thin films. Phys Procedia. 2013; 49:190–8.
Iftikar M A, Rzaij J M, Abbas QA, Ibrahim IM, Alatta HJ. Structural, Optical and Sensing Behavior of Neodymium-Doped Vanadium Pentoxide Thin Films. Iran J Sci Technol A. 2018; 42(4):2375–2386.
Umeokwonna NS, Ekpunobi AJ, Ekwo PI. Effects of Cobalt Doping on the Optical Properties of Cadmium Cobalt Oxide Nanofilms Deposited by Electrodeposition Method. Int J Eng Res 2015; 6(7):504–13.
Ibraheam AS, Rzaij J M, Fakhri M, Abdulwahhab A W. Structural, optical and electrical investigations of Al:ZnO nanostructures as UV photodetector synthesized by spray pyrolysis technique. Mater Res Express. 2019; 6(5).
Aishwarya V N, Nirmmala D N, Jeyaprakash B G, Chandiramouli R. Preparation and Characterization of Highly Conducting and Optically Transparent Fluorine Doped CdO Thin Films. J Appl Sci. 2012; 12(16):1630–5.
Ali O M. Elementary solid state physics : principles and applications. Addison-Wesley Publ Company, First Prin. 1975.
Rzaij J M, Ibrahim I M, Alalousi M A, Habubi N F. Hydrogen sulfide sensor based on cupric oxide thin films. Optik. 2018; 172:117–26.
Usharani K, Raja N, Manjula N, Nagarethinam VS, Balu AR. Characteristic Analysis on the Suitability of CdO Thin Films towards Optical Device Applications – Substrate Temperature Effect. Int J Thin Film Sci Tec. 2015; 4(89):89–96.
Kumar S, Singh F, Kapoor A. Study of valence band tailing effect induced by electronic excitations in nanocrystalline cadmium oxide thin films. Optik. 2016; 127(4):2055–8.
Haoshuang Gu, Zhao W, Yongming Hu. Hydrogen Gas Sensors Based on Semiconductor Oxide Nanostructures. Sensors. 2012; 12(5):5517.
Thambidurai M, Muthukumarasamy N, Velauthapillai D. Effect of Cr-doping on the structural and optical properties of CdS nanoparticles prepared by chemical precipitation method. J Mater. 2012; 4(4):1–5.