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Controlling Morphological Parameters of Anodized Titania Nanotubes for Optimized Solar Energy Applications
Department of Chemistry, Virginia Tech, Blacksburg, VA 24061-0212, USA
Energy and Transportation Science Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
* Authors to whom correspondence should be addressed.
Received: 3 September 2012; in revised form: 8 October 2012 / Accepted: 10 October 2012 / Published: 19 October 2012
Abstract: Anodized TiO2 nanotubes have received much attention for their use in solar energy applications including water oxidation cells and hybrid solar cells [dye-sensitized solar cells (DSSCs) and bulk heterojuntion solar cells (BHJs)]. High surface area allows for increased dye-adsorption and photon absorption. Titania nanotubes grown by anodization of titanium in fluoride-containing electrolytes are aligned perpendicular to the substrate surface, reducing the electron diffusion path to the external circuit in solar cells. The nanotube morphology can be optimized for the various applications by adjusting the anodization parameters but the optimum crystallinity of the nanotube arrays remains to be realized. In addition to morphology and crystallinity, the method of device fabrication significantly affects photon and electron dynamics and its energy conversion efficiency. This paper provides the state-of-the-art knowledge to achieve experimental tailoring of morphological parameters including nanotube diameter, length, wall thickness, array surface smoothness, and annealing of nanotube arrays.
Keywords: titania; TiO2; nanotube; water oxidation; bulk heterojunction solar cells; dye-sensitized solar cells; photoelectrochemical catalysis
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MDPI and ACS Style
Haring, A.; Morris, A.; Hu, M. Controlling Morphological Parameters of Anodized Titania Nanotubes for Optimized Solar Energy Applications. Materials 2012, 5, 1890-1909.
Haring A, Morris A, Hu M. Controlling Morphological Parameters of Anodized Titania Nanotubes for Optimized Solar Energy Applications. Materials. 2012; 5(10):1890-1909.
Haring, Andrew; Morris, Amanda; Hu, Michael. 2012. "Controlling Morphological Parameters of Anodized Titania Nanotubes for Optimized Solar Energy Applications." Materials 5, no. 10: 1890-1909.