Fabrication of double layer photoelectrodes using hierarchical TiO2 nanospheres for dye-sensitized solar cells

Double layer photoelectrodes consisting of the TiO2 nanoparticles (npTiO2) with 30-40 nm in diameter and the TiO2 nanospheres (nsTiO2) with 100-200 nm as a bottom and a top layer, respectively, were fabricated for dye-sensitized solar cells (DSSCs) employing a polymer electrolyte. The nsTiO2 with hi...

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Bibliographic Details
Published in:Journal of industrial and engineering chemistry (Seoul, Korea) 2012, 18(1), , pp.449-455
Main Authors: Park, Jung Tae, Roh, Dong Kyu, Chi, Won Seok, Patel, Rajkumar, Kim, Jong Hak
Format: Article
Language:English
Subjects:
Double layer
Dyes
Electrolytic cells
Nanospheres
Performance enhancement
Photovoltaic cells
Solar cells
Titanium dioxide
화학공학
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Summary:Double layer photoelectrodes consisting of the TiO2 nanoparticles (npTiO2) with 30-40 nm in diameter and the TiO2 nanospheres (nsTiO2) with 100-200 nm as a bottom and a top layer, respectively, were fabricated for dye-sensitized solar cells (DSSCs) employing a polymer electrolyte. The nsTiO2 with hierarchical pores were prepared via the combined process of atom transfer radical polymerization (ATRP) and a sol-gel. Use of nsTiO2 resulted in the remarkable enhancement of cell performance due to light scattering and dye adsorption capability. The overall energy conversion efficiency ( eta ) of 5.5% was achieved by the formation of npTiO2-nsTiO2 double layer photoelectrode, which was higher than those formed by npTiO2 alone (4.6%) or nsTiO2-nsTiO2 double layer (4.4%). Electrochemical impedance spectra (EIS) analysis showed that the npTiO2-nsTiO2 double layer had lower electron transfer resistance and longer electron lifetime, leading to facilitation of reduced recombination and consequently improvement of cell performance.
ISSN:1226-086X
1876-794X
DOI:10.1016/j.jiec.2011.11.029