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Frontiers of Optoelectronics

Front Optoelec    2012, Vol. 5 Issue (2) : 224-230     DOI: 10.1007/s12200-012-0198-5
RESEARCH ARTICLE |
Preparation of titanium dioxide-double-walled carbon nanotubes and its application in flexible dye-sensitized solar cells
Cunxi CHENG, Jihuai WU(), Yaoming XIAO, Yuan CHEN, Haijun YU, Ziying TANG, Jianming LIN, Miaoliang HUANG
Engineering Research Center of Environment-Friendly Functional Materials, Ministry of Education; Institute of Materials Physical Chemistry, Huaqiao University, Quanzhou 362021, China
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Abstract

Titanium dioxide-double-walled carbon nanotubes (TiO2-DWCNTs) with DWCNTs/TiO2 of 20 wt.% is prepared by a conventional sol-gel method. Doping the TiO2-DWCNTs in TiO2 photoanode, a flexible dye-sensitized solar cell (DSSC) is fabricated. The sample is characterized by scanning electron microscopy, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) absorption, ultraviolet-visible spectroscopy (UV-vis) absorption spectra,electrochemical impedance spectroscopy (EIS) technique and photovoltaic measurement. It is found that adding a certain amount of TiO2-DWCNTs can efficiently decrease the resistance of charge transport, improve dye adsorption. Under an optimal condition, a flexible DSSC contained with 0.50 wt.% TiO2-DWCNTs achieves a light-to-electric energy conversion efficiency of 3.89% under a simulate solar light irradiation of 100 mW·cm-2.

Keywords flexible dye-sensitized solar cell (DSSC)      titanium dioxide (TiO2)      double-walled carbon nanotube (DWCNT)      sol-gel method     
Corresponding Authors: WU Jihuai,Email:jhwu@hqu.edu.cn   
Issue Date: 05 June 2012
 Cite this article:   
Yaoming XIAO,Yuan CHEN,Haijun YU, et al. Preparation of titanium dioxide-double-walled carbon nanotubes and its application in flexible dye-sensitized solar cells[J]. Front Optoelec, 2012, 5(2): 224-230.
 URL:  
http://journal.hep.com.cn/foe/EN/10.1007/s12200-012-0198-5
http://journal.hep.com.cn/foe/EN/Y2012/V5/I2/224
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Yaoming XIAO
Yuan CHEN
Haijun YU
Ziying TANG
Jianming LIN
Miaoliang HUANG
Cunxi CHENG
Jihuai WU
Fig.1  Schematic view of (a) synthetic process of TiO-DWCNTs nanocomposites; (b) flexible DSSC
Fig.2  SEM images of (a) TiO nanoparticles; (b) oxidized DWCNTs; (c) and (d) DWCNTs covered with TiOnanoparticles ; (e) and (f) TiO film covered with 0.50 wt.% TiO-DWCNTs
Fig.3  XRD patterns of TiO (a) and TiO-DWCNT (b) nanopowder
Fig.4  FTIR spectra of (a) pristine DWCNTs; (b) TiO nanoparticles; (c) TiO-DWCNTs nanocomposites and (d) oxidized DWCNTs
Fig.5  Absorption spectra of dye desorbed fromTiO ?lms contained different amount of TiO-DWCNTs
TiO2-DWCNTs: TiO2/(wt.%)VOC/VJSC/(mA·cm-2)FFη/%
00.7875.440.7063.02
0.250.7866.130.7173.45
0.500.7886.690.7383.89
0.750.7715.340.6742.86
Tab.1  Photovoltaic performance of flexible DSSCs with different TiO-DWCNTs contents
Fig.6  Dark current curves for the flexible DSSCs
Fig.7  Electrochemical impedance spectra of the DSSCs with different TiO-DWCNTs contents
Fig.8  Current-voltage curves for the flexible DSSCs
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