Journal
APPLIED SURFACE SCIENCE
Volume 256, Issue 1, Pages 85-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2009.07.074
Keywords
Mesoporous TiO2; Thin films; Fe ions; Nanocrystalline; Optical properties
Categories
Funding
- Innovation Program of Shanghai Municipal Education Commission [08YZ08]
- AM Foundation of Shanghai City Committee of Science and Technology [08520741600]
- Systems Biology Research Foundation of Shanghai University [S30107]
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Fe-doped mesoporous titanium dioxide (M-TiO2-Fe) thin films have been prepared on indium tin oxide (ITO) glass substrates by sol-gel and spin coating methods. All films exhibited mesoporous structure with the pore size around 5-9 nm characterized by small angle X-ray diffraction (SAXRD) and further confirmed by high resolution transmission electron microscopy (HRTEM). Raman spectra illustrated that lower Fe-doping contributed to the formation of nanocrystalline of M-TiO2-Fe thin films. X-ray photoelectron spectroscopy (XPS) data indicated that the doped Fe ions exist in forms of Fe3+, which can play a role as e or h(+) traps and reduce e /h(+) pair recombination rate. Optical properties including refractive indices/n, energy gaps/E-g and Urbach energy width/E-0 of the thin films were estimated and investigated by UV/vis transmittance spectra. The presence of Fe content extended the light absorption band and decreased the values of n, implying enhanced light response and performance on dye-sensitized solar cells (DSSC). The optimum Fe content in M-TiO2-Fe thin films is determined as 10 mol%, for its compatibility of well crystalline and well potential electron transfer performance. Crown Copyright (C) 2009 Published by Elsevier B. V. All rights reserved.
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