期刊
MICROELECTRONIC ENGINEERING
卷 111, 期 -, 页码 137-142出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.mee.2013.03.037
关键词
Dye-sensitized solar cell; TiO2 nanotubes; Anodic oxidation; Electron lifetime; Charge transport
Dye-sensitized solar cells (DSCs) based on TiO2 nanotube/nanoparticle (NT/NP) composite photoanodes were fabricated including different NT content into the NP network. The NPs expose large surface area for the dye anchoring, while the incorporated nanotubes can improve the electron lifetime and scatter the incident photons enhancing the light harvesting. TiO2 NTs were fabricated by fast anodic oxidation of Ti foil and mixed into NP dispersion. Morphology of the as-grown NTs and of the prepared paste was investigated by means of Field Emission Scanning Electron Microscopy. DSCs were assembled and characterized by current-voltage electrical measurements and Incident Photon-to-electron Conversion Efficiency. Electrochemical Impedance Spectroscopy and Open Circuit Voltage Decay measurements were employed in order to study the recombination and to evaluate the electron lifetime into the anode materials. The overall photo-conversion efficiency of the NT/NP composite photoanode was found to be a 10% higher with respect to pure NP electrode evidencing an improvement of the charge lifetime. (C) 2013 Elsevier B.V. All rights reserved.
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