Journal ArticleDOI
Enhanced Charge-Collection Efficiencies and Light Scattering in Dye-Sensitized Solar Cells Using Oriented TiO2 Nanotubes Arrays
TLDR
Analysis of photocurrent measurements indicates that the light-harvesting efficiencies of NT-based DSSCs were higher than those found for D SSCs incorporating NPs owing to stronger internal light-scattering effects.Abstract:
We report on the microstructure and dynamics of electron transport and recombination in dye-sensitized solar cells (DSSCs) incorporating oriented TiO2 nanotube (NT) arrays. The morphology of the NT arrays, which were prepared from electrochemically anodized Ti foils, were characterized by scanning and transmission electron microscopies. The arrays were found to consist of closely packed NTs, several micrometers in length, with typical wall thicknesses and intertube spacings of 8−10 nm and pore diameters of about 30 nm. The calcined material was fully crystalline with individual NTs consisting of about 30 nm sized crystallites. The transport and recombination properties of the NT and nanoparticle (NP) films used in DSSCs were studied by frequency-resolved modulated photocurrent/photovoltage spectroscopies. While both morphologies display comparable transport times, recombination was much slower in the NT films, indicating that the NT-based DSSCs have significantly higher charge-collection efficiencies than...read more
Citations
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Journal ArticleDOI
Growth of oriented single-crystalline rutile TiO(2) nanorods on transparent conducting substrates for dye-sensitized solar cells.
Bin Liu,Eray S. Aydil +1 more
TL;DR: A facile, hydrothermal method was developed for the first time to grow oriented, single-crystalline rutile TiO(2) nanorod films on transparent conductive fluorine-doped tin oxide (FTO) substrates.
Journal ArticleDOI
TiO2 nanotubes: Self-organized electrochemical formation, properties and applications
Jan M. Macak,Hiroaki Tsuchiya,Andrei Ghicov,Kouji Yasuda,Robert Hahn,Sebastian Bauer,Patrik Schmuki +6 more
TL;DR: In this article, an overview and review on self-organized TiO2 nanotube layers and other transition metal oxide tubular structures grown by controlled anodic oxidation of a metal substrate is given.
Journal ArticleDOI
Vertically aligned single crystal TiO2 nanowire arrays grown directly on transparent conducting oxide coated glass: synthesis details and applications
Xinjian Feng,Karthik Shankar,Oomman K. Varghese,Maggie Paulose,Thomas J. LaTempa,Craig A. Grimes +5 more
TL;DR: This work presents a straightforward low temperature method to prepare single crystal rutile TiO2 nanowire arrays up to 5 microm long on TCO glass via a non-polar solvent/hydrophilic substrate interfacial reaction under mild hydrothermal conditions.
Journal ArticleDOI
Stem cell fate dictated solely by altered nanotube dimension
TL;DR: Altering the dimensions of nanotubular-shaped titanium oxide surface structures independently allowed either augmented human mesenchymal stem cell (hMSC) adhesion or a specific differentiation of hMSCs into osteoblasts by using only the geometric cues, absent of osteogenic inducing media.
Journal ArticleDOI
Origin of Photocatalytic Activity of Nitrogen-Doped TiO2 Nanobelts
Jin Wang,De Nyago Tafen,James P. Lewis,Zhanglian Hong,Ayyakkannu Manivannan,Mingjia Zhi,Ming Li,Nianqiang Wu +7 more
TL;DR: Experiments combined with the density functional theory (DFT) calculation have been performed to understand the underlying photocatalysis mechanism of the nitrogen-doped titania nanobelts, finding that nitrogen doping allows visible-light-responsive photocatalytic activity but lowers UV- light-responsive photochemical activity.
References
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Journal ArticleDOI
A low-cost, high-efficiency solar cell based on dye-sensitized colloidal TiO2 films
TL;DR: In this article, the authors describe a photovoltaic cell, created from low-to medium-purity materials through low-cost processes, which exhibits a commercially realistic energy-conversion efficiency.
Journal ArticleDOI
Formation of titanium oxide nanotube
TL;DR: In this article, a new route for the synthesis of a nanotube made of titanium oxide is presented, where needle-shaped TiO2 crystals (anatase phase) with a diameter of 8 nm and a length of 100 nm were obtained when sol−gel-derived fine TiO 2-based powders were treated chemically with a 5−10 M NaOH aqueous solution.
Journal ArticleDOI
Use of highly-ordered TiO(2) nanotube arrays in dye-sensitized solar cells.
TL;DR: Voltage-decay measurements indicate that the highly ordered TiO(2) nanotube arrays, in comparison to nanoparticulate systems, have superior electron lifetimes and provide excellent pathways for electron percolation.
Journal ArticleDOI
Titanium oxide nanotube arrays prepared by anodic oxidation
Dawei Gong,Craig A. Grimes,Oomman K. Varghese,Wenchong Hu,R. S. Singh,Zhi Chen,Elizabeth C. Dickey +6 more
TL;DR: In this article, the average tube diameter, ranging in size from 25 to 65 nm, was found to increase with increasing anodizing voltage, while the length of the tube was found independent of anodization time.
Journal ArticleDOI
Enhanced Photocleavage of Water Using Titania Nanotube Arrays
TL;DR: It is demonstrated that the wall thickness and length of the nanotubes can be controlled via anodization bath temperature and this hydrogen generation rate is the highest reported for a titania-based photoelectrochemical cell.