Journal
JOURNAL OF MATERIALS CHEMISTRY
Volume 22, Issue 40, Pages 21624-21629Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2jm34807a
Keywords
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Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF)
- Ministry of Education, Science and Technology (MEST) [2012-0000591, 2012001254]
- Industrial Strategic Technology Development Program (Human Activity Based Green Energy Harvesting and High Efficiency Power Transmission System) [10038599]
- Ministry of Knowledge Economy, Republic of Korea
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Poly(3,4-ethylenedioxythiophene) nanofibers (PEDOT-NFs) with 10-50 nm diameters and high electrical conductivity (up to 83 S cm(-1)) have been fabricated chemically within micelles composed of sodium dodecyl sulfate (SDS) as nanoreactors. Dimethyl sulfoxide (DMSO, 5 wt%) was added to a methanol-based colloidal dispersion containing PEDOT-NFs to improve dispersibility. The dye-sensitized solar cells (DSSCs) using PEDOT-NFs as a counter electrode (CE) with low surface resistance and a highly porous surface exhibited enhanced power conversion efficiency (9.2%) compared to bulk PEDOT (6.8%). To date, PEDOT-NFs have shown the highest performance among CEs using PEDOT. It also surpassed the efficiency of platinum (Pt) CEs (8.6%). Electrochemical characterization, such as cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS), showed that PEDOT-NFs efficiently reduced triiodide due to the enhanced electrical and morphological properties, which contributed to the high current density (17.5 mA cm(-2)) and fill factor (72.6%).
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