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TiO 2 microspheres assembled by single crystalline rutile TiO 2 nanorods were synthesized by one-pot solvothermal treatment at 180 °C based on an aqueous–organic mixture solution containing n -hexane, distilled water, titanium n -butoxide and hydrochloric acid. The spheres had a radiative structure from the center, and their diameters were controlled in the range from 1 to 5 μm by adjusting the volume of the reactant water. Nitrogen adsorption–desorption isotherms showed that all the as-prepared microspheres had relatively high specific surface areas of about 50 m 2 g −1 . The 1 μm sized TiO 2 nanorod microspheres were fabricated as a scattering overlayer in DSSCs, leading to a remarkable improvement in the power conversion efficiency: 8.22% of the bi-layer DSSCs versus 7.00% for the reference cell made of a single-layer film prepared from nanocrystalline TiO 2 . Such improvement was mainly attributed to the enhanced light harvesting and dye loading brought by the effective scattering centers.
Nanoscale – Royal Society of Chemistry
Published: Sep 26, 2013
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