期刊
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
卷 75, 期 2, 页码 182-187出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jpcs.2013.09.008
关键词
Thin films; Chemical synthesis; Raman spectroscopy; X-Ray diffraction; Optical properties
资金
- 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
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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