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Amplifying Charge-Transfer Characteristics of Graphene for Triiodide Reduction in Dye-Sensitized Solar Cells

Title
Amplifying Charge-Transfer Characteristics of Graphene for Triiodide Reduction in Dye-Sensitized Solar Cells
Author
강용수
Keywords
CHEMICAL-VAPOR-DEPOSITION; COUNTER-ELECTRODE; CARBON NANOTUBES; LOW-COST; FILMS; TRANSPARENT; GRAPHITE; LAYER; OXIDE; INTERCALATION
Issue Date
2011-08
Publisher
WILEY-V C H VERLAG GMBH, BOSCHSTRASSE 12, D-69469 WEINHEIM, GERMANY
Citation
Advanced Functional Materials, Vol.21 No.19 [2011], 3729-3736
Abstract
The fabrication and functionalization of large-area graphene and its electrocatalytic properties for iodine reduction in a dye-sensitized solar cell are reported. The graphene film, grown by thermal chemical vapor deposition, contains three to five layers of monolayer graphene, as confirmed by Raman spectroscopy and high-resolution transmission electron microscopy. Further, the graphene film is treated with CF4 reactive-ion plasma and fluorine ions are successfully doped into graphene as confirmed by X-ray photoelectron spectroscopy and UV-photoemission spectroscopy. The fluorinated graphene shows no structural deformations compared to the pristine graphene except an increase in surface roughness. Electrochemical characterization reveals that the catalytic activity of graphene for iodine reduction increases with increasing plasma treatment time, which is attributed to an increase in catalytic sites. Further, the fluorinated graphene is characterized in use as a counter-electrode in a full dye-sensitized solar cell and shows ca. 2.56% photon to electron conversion efficiency with ca. 11 mA cm(-2) current density. The shift in work function in F- doped graphene is attributed to the shift in graphene redox potential which results in graphene's electrocatalytic-activity enhancement.
URI
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201101191/abstract?
ISSN
1616-301X; 1616-3028
DOI
10.1002/adfm.201101191
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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