| 초록 |
Dye-sensitized solar cells (DSSCs) incorporating TiO2 nanofibers prepared at a low temperature (150°C), along with multi-walled carbon nanotubes (MWCNTs) were studied using a polymer gel electrolyte, PVDF-HFP. The TiO2 nanofiber electrode with various amount of acid-treated MWCNTs was then electrospun directly onto a ITO substrate from a mixture of titanium isopropoxide and poly(vinylacetate) (PVAc) in dimethyl formamide. Electrochemical impedance spectroscopy (EIS) was employed to quantify the charge transport resistance and electron lifetime under different levels (wt%) of MWCNTs. The charge transport resistance at the TiO2/dye/electrolyte interface increased as a function of the MWCNTs from 0.1 to 0.5 wt%, due to a decrease in the surface area and less dye adsorption. With 0.1 wt% MWCNTs/TiO2 nanofiber electrode, the DSSCs had the highest cell performance and the longest electron life time in the TiO2 electrode. |
