Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5361148 | Applied Surface Science | 2009 | 5 Pages |
Abstract
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 5-9Â 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 eâ or h+ traps and reduce eâ/h+ pair recombination rate. Optical properties including refractive indices/n, energy gaps/Eg and Urbach energy width/E0 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 10Â mol%, for its compatibility of well crystalline and well potential electron transfer performance.
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Authors
Yun Zhang, Yue Shen, Feng Gu, Mingming Wu, Yian Xie, Jiancheng Zhang,