Journal
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume 75, Issue 2, Pages 182-187Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2013.09.008
Keywords
Thin films; Chemical synthesis; Raman spectroscopy; X-Ray diffraction; Optical properties
Funding
- Department of Science and Technology (DST)
- Ministry of New and Renewable Energy (MNRE), Government of India
- Centre for Nanomaterials and Quantum Systems (CNQS), University of Pune
- Bank of Maharashtra, University of Pune branch
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Nanocrystalline thin films of TiO2 were prepared on glass substrates from an aqueous solution of TiCl3 and NH4OH at room temperature using the simple and cost-effective chemical bath deposition (CBD) method. The influence of deposition time on structural, morphological and optical properties was systematically investigated. TiO2 transition from a mixed anatase-rutile phase to a pure rutile phase was revealed by low-angle XRD and Raman spectroscopy. Rutile phase formation was confirmed by FTIR spectroscopy. Scanning electron micrographs revealed that the multigrain structure of as-deposited TiO2 thin films was completely converted into semi-spherical nanoparticles. Optical studies showed that rutile thin films had a high absorption coefficient and a direct bandgap. The optical bandgap decreased slightly (3.29-3.07 eV) with increasing deposition time. The ease of deposition of rutile thin films at low temperature is useful for the fabrication of extremely thin absorber (ETA) solar cells, dye-sensitized solar cells, and gas sensors. (C) 2013 Elsevier Ltd. All rights reserved.
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