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Composite multi-functional over layer: A novel design to improve the photovoltaic performance of DSSC

Title
Composite multi-functional over layer: A novel design to improve the photovoltaic performance of DSSC
Author
정성훈
Keywords
Composite over layer; Titanium nanotube; Multi-functional; DSSC; Scattering; bi-layer
Issue Date
2015-04
Publisher
ELSEVIER SCIENCE BV
Citation
SOLAR ENERGY MATERIALS AND SOLAR CELLS, Page. 141-149
Abstract
Light scattering in dye-sensitized solar cell (DSSC) plays a vital role in extending the traveling distance by confining light propagation within the photoanode and also promotes interaction of incident photons with the dye molecules. A novel strategy was adopted to improve the performance of DSSC with better absorption of solar spectrum both in the visible as well as near IR regions. A double layer photoanode structure with TiO2 nanoparticles (P25) as main layer and composite of titanium nanotubes (TNTs) and P25 as over-layer was introduced. Three different compositions of TNT/P25 were investigated, and finally an optimized composition with excellent performance was prepared. Performance of cells having composite over-layer was compared with the cells having TNT and conventional bigger particles (G2) over-layers. Composite over-layer structure of 75/25-TNT/P25 showed best photovoltaic performance of 8.52% with J(sc) of 16.49 mA/cm(2), which is 7.30% higher than the cells having G2 over-layer and 4.9% higher than the cells having pure TNT over-layer. Different characterization analysis proved that DSSC with optimized composite over-layer structure has significant advantages of better dye adsorption, large surface area, better photo-electron generation, superior electron recombination restraint characteristics, better conductive behavior, better light scattering, and long electron lifetime. Composite over-layer structure is a promising and innovative approach for further improving the efficiency of DSSC and this will be a concrete fundamental background toward the development of the applications of the next generation dye-sensitized solar cells. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S092702481500166Xhttp://hdl.handle.net/20.500.11754/23768
ISSN
0927-0248; 1879-3398
DOI
10.1016/j.solmat.2015.04.011
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ORGANIC AND NANO ENGINEERING(유기나노공학과) > Articles
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