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Electrodeposition of Cobalt Selenide Thin Films by Fangyang Liu; Bo Wang; Yanqing Lai; Jie Li; Zhian Zhang; Yexiang Liu is a Engineering article available to read on EtoBox.

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Cobalt selenide thin films have been prepared onto tin oxide glass substrates by electrodeposition potentiostatically from an aqueous acid bath containing H 2 SeO 3 and Co͑CH 3 COO͒ 2 at 50°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 Ϫ0.5 V vs saturated calomel electrode. The electrodeposited CoSe film exhibits an optical absorption coefficient of higher than 10 5 cm -1 and an optical bandgap of 1.53 Ϯ 0.01 eV.

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Author

Fangyang Liu; Bo Wang; Yanqing Lai; Jie Li; Zhian Zhang; Yexiang Liu

Publisher

The Electrochemical Society

Published

2010

Language

EN

Field

Engineering (Physical Sciences)