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Nano Lett. 2010 May 12;10(5):1632-8. doi: 10.1021/nl904125q.

Enhanced electron collection efficiency in dye-sensitized solar cells based on nanostructured TiO(2) hollow fibers.

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Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran.


Nanostructured TiO(2) hollow fibers have been prepared using natural cellulose fibers as a template. This cheap and easily processed material was used to produce highly porous photoanodes incorporated in dye-sensitized solar cells and exhibited remarkably enhanced electron transport properties compared to mesoscopic films made of spherical nanoparticles. Photoinjected electron lifetime, in particular, was multiplied by 3-4 in the fiber morphology, while the electron transport rate within the fibrous photoanaode was doubled. A nearly quantitative absorbed photon-to-electrical current conversion yield exceeding 95% was achieved upon excitation at 550 nm and a photovoltaic power conversion efficiency of 7.2% reached under simulated AM 1.5 (100 mW cm(-2)) solar illumination.

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