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Seo S.H.,Advanced Materials and Application Research Division | Kim S.Y.,Advanced Materials and Application Research Division | Koo B.-K.,Advanced Materials and Application Research Division | Cha S.-I.,Advanced Materials and Application Research Division | Lee D.Y.,Advanced Materials and Application Research Division
Langmuir | Year: 2010

Efficient dye-sensitized solar cells (DSCs) were realized by using multiwalled carbon nanotubes (CNTs) as the counter-electrode catalyst. The catalytic layers were produced from an aqueous paste of mass-produced raw CNTs with carboxymethylcellulose polymer by low-temperature (70 °C) drying. We found that the highly disordered CNTs played the important role of increasing the fill factor of DSCs with electrolytes including large molecules and that the presence of Li + as the counter charges for I3 -/I- redox couples reduced the chemical stability when using the CNT catalyst. Our experiments showed that by replacing the conventional Pt catalyst and Li + -based electrolyte with the proposed CNT catalyst and an electrolyte containing 1-butyl-3-methylimidazolium cations instead of Li + , the energy conversion efficiency increased from 6.51% to 7.13%. This result suggests that highly defective CNT catalysts prepared by lowtemperature drying are viable cost-effective alternatives for DSCs, as long as the electrolytes composition is optimized. © 2010 American Chemical Society. Source

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