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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/14810

Title: Investigating the effect of deposition time on the morphology, structure and optical band gap of PbS thin films synthesized by CBD technique
Authors: Hone, Fekadu Gashaw
Ampong, Francis Kofi
Abza, Tizazu
Nkrumah, Isaac
Nkum, Robert Kwame
Keywords: Lead sulphide thin film,
Nanocrystalline,
Chemical bath deposition
Preferred orientations.
Issue Date: Nov-2014
Publisher: Thin Film Technology
Citation: Thin Film Technology
Abstract: Nanocrystalline lead sulphide thin films have been deposited on glass substrates from chemical baths containing lead acetate, sodium hydroxide, ammonia and thiourea at a bath temperature of 90 0C and a pH of about 12. Three different samples were prepared with deposition times of 30, 45 and 60 minutes respectively. The films were characterized using a variety of techniques. X-ray diffraction analyses revealed that all the films were polycrystalline in nature with the diffraction peaks indexed to the face centered cubic structure. The deposition time strongly influenced the preferred orientations of the crystallites as well as structural parameters such as average crystallite size, strain and dislocation density. SEM micrographs of all the films showed a highly compact surface composed of sharp-edged cubic shaped grains of different sizes. The elemental compositions of the films were confirmed by energy dispersive X-ray spectroscopy. The optical band gap of the films decreased from 1.32 eV to 1.10 eV with increasing deposition time.
Description: This article is published by Thin Film Technology
URI: http://hdl.handle.net/123456789/14810
Appears in Collections:College of Science

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