Abstract
We report on a comparative study of hybrid solar cells based on blends of poly(3-hexylthiophene) (P3HT) and TiO 2 nanorods. Two types of ultrathin TiO 2 nanorods, linear and branched, have been synthesized for the first time, and surface modified with different dyes before blending with P3HT. Using pristine P3HT as a reference, the short-circuit current and energy conversion efficiency of poly(3-hexylthiophene)/pyridine-HgBrRed-modified branched-TiO 2 solar cells were increased by over an order of magnitude, which were also 2–3 times those of the corresponding linear-TiO 2 cells. Our results indicate that the branching and the surface dye modification of TiO 2 nanorods could effectively facilitate charge transport in the nanostructured network and exciton dissociation at the inorganic/organic interfaces. Thermal treatment of the blend films was found to further increase the efficiency up to 0.16%.
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