Abstract
Abstract Vertically oriented nanotubular titania arrays with a length of ca. 12 μm were fabricated by anodisation of titanium foils. Rietveld refinements of grazing incidence and wide angle XRD patterns for the annealed nanotube titania array showed that they consist of anatase crystals with a pronounced size anisotropy and a moderate preferred orientation. The energy conversion efficiency of dye sensitized solar cells based on the annealed nanotubular anatase array exceeds 6% under standard AM1.5 100 mW/cm2 irradiance and thus outperforms solar cells based on anatase nanoparticles when comparing analogous back illumination cell designs. Electrochemical impedance spectroscopy was employed to clarify the origin of the improved short circuit current and conversion efficiency. It was found that the effective diffusion length in the nanotube cells reaches >100 μm and no longer limits the onversion efficiency. The faster electron transport can be traced back to the larger crystallite size and the reduced intergrain orientation mismatch in the titania nanotubes.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Zeitschrift für Kristallographie - Crystalline Materials
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
