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Structural and optical investigations on CdS thin films grown by chemical bath technique

Ramaiah, KS, Pilkington, RD, Hill, AE, Tomlinson, RD and Bhatnagar, AK 2001, 'Structural and optical investigations on CdS thin films grown by chemical bath technique' , Materials Chemistry and Physics, 68 (1-3) , pp. 22-30.

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Abstract

Cadmium sulphide (CdS) thin films have been prepared by using a chemical bath deposition (CBD) method. Structural analysis (XRD and TEM) revealed that the films showed hexagonal structure with lattice constants a=0.4015 nm and c=0.6545 nm. On annealing, the films exhibited secondary phase of beta -CdS (cubic) along with hexagonal phase, but density of dislocations decreased. The stacking faults have been observed in the crystalline arrangement by high resolution transmission electron microscopy (HRTEM). The direct band gaps of as-grown and annealed films were found to be 2.42 and 2.62 eV with sub band gap of 2.35 eV, respectively, which were confirmed by optical analysis. On annealing, the resistivity of the films decreased from 3 x 10(6) to 1 x 10(3) Omega cm. Multiple Cd and S defects were observed by employing photoluminescence (PL) method. The intensities of emission peaks for annealed films differed with that of as-grown films. As was discussed with giving reasons.

Item Type: Article
Themes: Subjects / Themes > Q Science > QD Chemistry
Subjects / Themes > Q Science > QC Physics
Subjects outside of the University Themes
Schools: Colleges and Schools > College of Science & Technology
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering
Colleges and Schools > College of Science & Technology > School of Computing, Science and Engineering > Materials & Physics Research Centre
Journal or Publication Title: Materials Chemistry and Physics
Publisher: Elsevier
Refereed: Yes
ISSN: 02540584
Depositing User: H Kenna
Date Deposited: 07 Sep 2007 09:54
Last Modified: 20 Aug 2013 16:47
URI: http://usir.salford.ac.uk/id/eprint/403

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