Dye-sensitized solar cells based on P-phenylenediamine treated multiwalled carbon nanotubes-titanium dioxide nanocomposite photoelectrode

• Main Authors: Chun-Tsung Hsu, 許峻綜
• Other Authors: Yu-Chen Tsai
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/wm58pk

碩士 === 國立中興大學 === 化學工程學系所 === 99 === The incorporation of P-phenylenediamine treated multi-walled carbon nanotubes (MWCNTs) into titanium dioxide network that contributes to a significant improvement in the energy conversion efficiency of dye-sensitized solar cells (DSSCs) has been demonstrated. Well-dispersed NH2-MWCNTs-TiO2 nanocomposite were modified on fluorine-doped tin oxide (FTO) glass. Then we change the contain of NH2-MWCNTs doped in TiO2 nanocrystalline matrix and alter the film thickness of NH2-MWCNTs(0.025 wt%)-TiO2 nanocomposite photoelectrde. The distribution of NH2-MWCNTs in TiO2 matrix and the film thickness of NH2-MWCNTs-TiO2 nanocomposite were investigate by field emission scanning electron microscopy (FESEM). The adsorption of dye-sensitizer on the working electrode were characterized by Ultraviolet-Visible spectroscopy (UV-Vis). UV-Vis spectrum reveal more higher absorbance on NH2-MWCNTs-TiO2 nanocomposite photoelectrode than the others. The charge resistance in the DSSC was characterized by electrochemical impedance spectroscopy (EIS). EIS results exhibit a decrease in the charge resistance of electrolyte/dye/NH2-MWCNTs-TiO2 interface with increasing NH2-MWCNTs contents which leads to an improvement in the photovoltaic performance up to 0.025 wt%. Compare with the nanocrystalline TiO2 DSSCs, the NH2-MWCNTs (0.025 wt%)-TiO2 nanocomposite photoelectrode in DSSCs shows ~76 % increase in solar-to-electric energy conversion efficiency, which is attributed to the inclusion of NH2-MWCNTs in TiO2 network.