Ghadiri, ElhamTaghavinia, NimaZakeeruddin, Shaik M.Graetzel, MichaelMoser, Jacques-E.2010-09-092010-09-092010-09-09201010.1021/nl904125qhttps://infoscience.epfl.ch/handle/20.500.14299/53474WOS:000277444900019Nanostructured TiO2 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.Dye-sensitized solar cellsTiO2 nanostructured hollow fiberscharge transportinterfacial electron transfer dynamicstransient photovoltage and photocurrenttime-resolved diffuse reflectanceTransparent Conducting OxideNanotube ArraysRecombinationTransportFilmstext::journal::journal article::research article