Abstract
We prepared highly ordered titanium dioxide nanotube arrays (TNAs) by anodizing Ti foils in F − containing electrolyte. The thickness and dye loading amount of TNAs were 26 μm and 1.06 × 10 −7 mol cm −2, respectively. TiO 2 nanoparticles (TNPs) were electrophoretically deposited on the inner wall of nanotube to produce coated nanotube arrays (TNAP). The dye loading was increased to 1.56 × 10 −7 mol cm −2, and the electron transport rate improved. TNAs and TNAP were sensitized with ruthenium dye N3 to yield dye-sensitized TiO 2 nanotube solar cells. The power conversion efficiency of TNA-based dye-sensitized solar cells (DSSCs) was 4.28%, whereas the efficiency of TNAP-based DSSCs increased to 6.28% when illuminated from the counter electrode. The increase of power conversion efficiency of TNAP-based DSSCs is ascribed to the increased surface area of TNAs and the faster electron transport rate.
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