Enhanced Electron Collection Efficiency in Dye-Sensitized Solar Cells Based on Nanostructured TiO2 Hollow Fibers
Nanostructured 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.
Keywords: Dye-sensitized solar cells ; TiO2 nanostructured hollow fibers ; charge transport ; interfacial electron transfer dynamics ; transient photovoltage and photocurrent ; time-resolved diffuse reflectance ; Transparent Conducting Oxide ; Nanotube Arrays ; Recombination ; Transport ; Films
Record created on 2010-09-09, modified on 2016-08-08