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Efficient Performance of Electrostatic Spray-Deposited TiO2 Blocking Layers in Dye-Sensitized Solar Cells after Swift Heavy Ion Beam Irradiation

Title
Efficient Performance of Electrostatic Spray-Deposited TiO2 Blocking Layers in Dye-Sensitized Solar Cells after Swift Heavy Ion Beam Irradiation
Author
강용수
Keywords
THIN-FILMS; ELECTRODES; LIGHT
Issue Date
2011-01
Publisher
SPRINGER, 233 SPRING ST, NEW YORK, NY 10013 USA
Citation
NANOSCALE RESEARCH LETTERS,Vol.6 No.1 [2010],1-7
Abstract
A compact TiO2 layer (similar to 1.1 mu m) prepared by electrostatic spray deposition (ESD) and swift heavy ion beam (SHI) irradiation using oxygen ions onto a fluorinated tin oxide (FTO) conducting substrate showed enhancement of photovoltaic performance in dye-sensitized solar cells (DSSCs). The short circuit current density (J(sc) = 12.2 mA cm(-2)) of DSSCs was found to increase significantly when an ESD technique was applied for fabrication of the TiO2 blocking layer, compared to a conventional spin-coated layer (J(sc) = 8.9 mA cm(-2)). When SHI irradiation of oxygen ions of fluence 1 x 10(13) ions/cm(2) was carried out on the ESD TiO2, it was found that the energy conversion efficiency improved mainly due to the increase in open circuit voltage of DSSCs. This increased energy conversion efficiency seems to be associated with improved electronic energy transfer by increasing the densification of the blocking layer and improving the adhesion between the blocking layer and the FTO substrate. The adhesion results from instantaneous local melting of the TiO2 particles. An increase in the electron transport from the blocking layer may also retard the electron recombination process due to the oxidized species present in the electrolyte. These findings from novel treatments using ESD and SHI irradiation techniques may provide a new tool to improve the photovoltaic performance of DSSCs.
URI
https://nanoscalereslett.springeropen.com/articles/10.1007/s11671-010-9763-2http://hdl.handle.net/20.500.11754/66181
ISSN
1931-7573; 1556-276x
DOI
10.1007/s11671-010-9763-2
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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