A series of one-dimensional anatase nanorods TiO2 with various lengths and aspect ratios are synthesized. The smallest rods TiO2 (EOA) with a length of 20-40 nm and a width of about 5 nm possess extremely high surface area (151.5 m2 g-1) compared to P25 (56.4 m 2 g-1) and the largest rods TiO2 (TMA-L) with a length of 800 nm and a width of about 200 nm result in very low transmittance. The EOA show the lower Rw (charge transport resistance) and higher Rk (charge recombination resistance) than the P25. It indicates that the one-dimensional TiO2 structure lowers the charge transport resistance by decreasing grain boundary and stretching grown structure with the specified directionality, and increases recombination reaction due to reducing the surface defects. A higher light-to-electricity conversion yield of 5.61% is achieved by applying the EOA as compared with P25 (5.08%). The TMA-L coat on the EOA film to form double-layer films enhances the efficiency from 5.61 to 5.84%, and the scattering layer of the blending of EOA and TMA-L coated on the EOA film raises the efficiency to 6.08%.
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