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Facile Tuning of the Size and Shape of TiO2 Nanorods Enables Optimiznation of Charge Collection Kinteicsfor Highly Efficient Dye-Sensitized Solar Cells

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Abstract

In this work, we have found a new way to succeed in the nanorods through ”oriented-attachment’’ with diameters tunable from 15 to 50 nm and lengths from 60 to 100 nm and large nanospindles with about 400nm in diameter to made as scattering layer by hydrothermal treatment. These single-crystalline TiO2 nanorods are ideal for constructing mesoscopic photo-anode films due to the faster electron transfer and slowed recombination than in disordered nanoparticles. Indeed, DSSCs based on these photoanodes have achieved much improved efficiency compared to cells prepared with standard Degussa P25 TiO2 photoanodes. The electron diffusion and recombination kinetics have been critically compared for the first time with respect to the size and shape of the novel building blocks. A high efficiency of 8.87% has been finally achieved for DSSC based on long thin NRs rather than short-thin or long-thick NRs or Degussa P25, which possesses balanced optimizations on charge collection and light harvesting properties.

© 2015 Optical Society of America

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