Electrodeposition of Cobalt Selenide Thin Films
- 1 January 2010
- journal article
- Published by The Electrochemical Society in Journal of the Electrochemical Society
- Vol. 157 (10), D523-D527
- https://doi.org/10.1149/1.3468675
Abstract
Cobalt selenide thin films have been prepared onto tin oxide glass substrates by electrodeposition potentiostatically from an aqueous acid bath containing H2SeO3H2SeO3 and Co(CH3COO)2Co(CH3COO)2 at 50°C50°C . The electrodeposition mechanism was investigated by cyclic voltammetry. The morphological, compositional, structural, and optical properties of the deposited films have been studied using scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction, and optical absorption techniques, respectively. The formation of cobalt selenide was confirmed to proceed via an underpotential deposition mechanism. Se-rich CoSe thin films with compact and homogeneous morphology and hexagonal crystal structure were obtained at a deposition potential of −0.5 V vs saturated calomel electrode. The electrodeposited CoSe film exhibits an optical absorption coefficient of higher than 105cm−1105cm−1 and an optical bandgap of 1.53±0.01eV1.53±0.01eV .Keywords
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