Properties of cadmium sulfide thin films deposited by chemical bath deposition with ultrasonication |
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Authors: | Jun Young Choe Kang-Jin Kim Donghwan Kim |
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Affiliation: | (1) Division of Materials Science and Engineering, Korea;(2) Department of Chemistry Korea, University 5 Anam-dong, Sungbuk-ku, 136-701 Seoul, Korea |
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Abstract: | Ultrasonic agitation was applied during the chemical bath deposition of CdS thin films. Ultrasonication resulted in a dramatic
change in the surface morphology, growth rate, and optical properties of CdS films. There were virtually no colloidal particles
adsorbed on the surface. The surface roughness measured by atomic force microscopy was reduced by a factor of two. Band gap
energy increased to 2.39 eV from 2.37 eV. X-ray patterns showed that the preferred orientation changed from hexagonal (002)/cubic
(111) to hexagonal (101). Optical transmission improved in the wavelength range larger than 520nm. The chemical reaction for
CdS formation started at a lower temperature under ultrasonication, and dense films were obtained even when the chemical composition
of the aqueous solution deviated far from optimum conditions. |
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