Journal
SURFACE & COATINGS TECHNOLOGY
Volume 231, Issue -, Pages 126-130Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2012.01.064
Keywords
Dye-sensitized solar cell; TiO2 compact layer; Magnetron sputtering
Funding
- National Natural Science Foundation of China [10774046]
- Shanghai Municipal Science and Technology Committee [09JC1404600]
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We investigated the characteristics of TiO2 compact layers grown by RF and pulsed DC magnetron sputtering on F-doped SnO2 (FTO) electrodes from a TiO2 ceramic target. The morphological and microstructural properties of the formed TiO2 layers were characterized by scanning electronic microscopy and X-ray diffraction. The deposition rate of the compact TiO2 layer by pulsed DC sputtering was much higher than that of RF deposition under the same sputter power and deposition pressure. Moreover, it was found that the power conversion efficiency of the dye-sensitized solar cells (DSCs) is strongly dependent on the thickness of both RF and DC sputtered TiO2 layer inserted between FTO electrode and nanoporous TiO2 layer. The thickness of the sputtered TiO2 layer was changed from 0 to 200 nm. The electrochemical impedance spectroscopy (EIS) technique was employed to evaluate the recombination resistance and electron lifetime in DSCs with differently thick TiO2 passivating films. The DSC fabricated on 160 nm thick TiO2 passivating FTO electrode showed the maximum power conversion efficiency of 7.90% due to highly effective prevention of the electron transfer to electrolyte. (C) 2012 Elsevier B.V. All rights reserved.
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