Optical and electrochemical capacitive properties of copper (I) iodide thin film deposited by SILAR method

Blessing N. Ezealigo; Assumpta C. Nwanya; Aline Simo; Rose U. Osuji; R. Bucher; Malik Maaza; Fabian I. Ezema

Arabian Journal of Chemistry (Dec 2019)

Optical and electrochemical capacitive properties of copper (I) iodide thin film deposited by SILAR method

Blessing N. Ezealigo,
Assumpta C. Nwanya,
Aline Simo,
Rose U. Osuji,
R. Bucher,
Malik Maaza,
Fabian I. Ezema

Affiliations

Blessing N. Ezealigo: Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
Assumpta C. Nwanya: Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria
Aline Simo: Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa; UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa
Rose U. Osuji: Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria; UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa
R. Bucher: Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa
Malik Maaza: Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa; UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa
Fabian I. Ezema: Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria; Nanosciences African Network (NANOAFNET), iThemba LABS-National Research Foundation, 1 Old Faure road, Somerset West 7129, P.O. Box 722, Somerset West, Western Cape Province, South Africa; UNESCO-UNISA Africa Chair in Nanosciences/Nanotechnology, College of Graduate Studies, University of South Africa (UNISA), Muckleneuk Ridge, P.O. Box 392, Pretoria, South Africa; Corresponding author at: Department of Physics and Astronomy, University of Nigeria, Nsukka, Nigeria.

Journal volume & issue: Vol. 12, no. 8
pp. 5380 – 5391

Abstract

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Economical Successive Ionic Layer Adsorption and Reaction (SILAR) method was used to deposit copper iodide (CuI) thin films on amorphous glass and stainless steel (SS) substrates at room temperature. The resulting thin films were characterized for their structural, morphological and optical properties using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and UV–vis Spectroscopy respectively. The energy band gap observed for the material was 2.98 and 2.78 eV at 20 and 30 cycles respectively. The electrochemical properties of this p-type semiconductor were characterized by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS) in Na2SO4 electrolyte. The CuI film on SS gave a specific capacitance of 93 Fg−1 at a scan rate of 2 mV/s with an excellent long-term cycle and reversible stability. Keywords: CuI, Photoluminescence, Successive ionic layer adsorption and reaction (SILAR), Specific capacitance, Electrochemical impedance spectroscopy (EIS), Supercapacitor

Published in Arabian Journal of Chemistry

ISSN: 1878-5352 (Print)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Chemistry
Website: http://www.journals.elsevier.com/arabian-journal-of-chemistry/

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