Abstract
Nanocomposite architectures consisting of conductive carbon nanotubes (CNTs) and nanocrystalline TiO2 films are prepared as photoanodes of dye-sensitized solar cells (DSCs). It is observed that both the electron transport time and electron lifetime decrease with CNT addition, implying that its incorporation is effective in enhancing the electro-conductivity of mesoscopic TiO2 contacts. To rectify CNT orientations, a parallel electric field is applied during the sample preparation, which gives rise to a significant enhancement in the energy conversion efficiency of resultant DSCs. Electrochemical impedance spectroscopy clarifies the photoelectrochemical processes, with enhanced contribution to the efficient electron transport, arising from the increased CNT orientation.
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