Double layered nanoarchitecture based on anodic TiO2 nanotubes for dye-sensitized solar cells

Title
Double layered nanoarchitecture based on anodic TiO2 nanotubes for dye-sensitized solar cells
Author(s)
안보은[안보은]김현식[김현식]양시경[양시경]안광순강순형[강순형]
Keywords
TITANIA NANOTUBES; ARRAYS; EFFICIENCY; TRANSPORT
Issue Date
201401
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY, v.274, pp.20 - 26
Abstract
Based on the TiO2 nanotube (TONT) with three different thicknesses (10, 18, 28 mu m) prepared by electrochemical anodization, a double layered electrode consisting of TONT and TiO2 nanoparticles (TONPs) with a size of approximately 20 nm was developed. The anodic TONT electrode has been actively investigated due to its beneficial properties such as a favorable electron transport rate and light scattering ability. However, the small specific surface area caused by the large pores and vacant space between 1-D NTs impedes the fabrication of high efficient DSSCs. Hence, the TONP layer with a thickness of 10 mu m is additionally deposited on the top surface of the TONT film to offer a sufficient surface area for large dye loading. Compared to a single TONT electrode, the double layered TONT/NP electrodes provide a high short-circuit current density (J(sc)) and fill factor (FF) while maintaining a constant open-circuit voltage (V-oc), finally disclosing a higher conversion efficiency (eta), attributed to the high loading of dye molecules, light scattering ability, low resistance in the photoanode/electrolyte interface, and longer electron life-times. In particular, the optimal eta was attained with the TONT/NP (18 mu m) electrode having a V-oc of 0.80V, a J(sc) of 7.80 mA/cm(2), a FF of 62.7%, and a eta of 3.93%. Incidentally, when using a longer TONT film (28 mu m), eta decreases steadily due to the fast charge recombination process. A more detailed discussion is included below. (C) 2013 Elsevier B.V. All rights reserved.
URI
http://hdl.handle.net/YU.REPOSITORY/33492http://dx.doi.org/10.1016/j.jphotochem.2013.09.014
ISSN
1010-6030
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공과대학 > 화학공학부 > Articles
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