Journal
NANO LETTERS
Volume 10, Issue 5, Pages 1632-1638Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl904125q
Keywords
Dye-sensitized solar cells; TiO2 nanostructured hollow fibers; charge transport; interfacial electron transfer dynamics; transient photovoltage and photocurrent; time-resolved diffuse reflectance
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Funding
- Swiss National Science Foundation [200020-125163]
- Iran Ministry of Science, Research, and Technology
- Research Institute for Petroleum Industry (RIPI)
- Swiss National Science Foundation (SNF) [200020_125163] Funding Source: Swiss National Science Foundation (SNF)
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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.
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