Journal
ELECTROCHIMICA ACTA
Volume 55, Issue 7, Pages 2567-2574Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.12.035
Keywords
Dye-sensitized solar cells; Hydrogen bonding; Supramolecular electrolyte; Conductivity; Energy conversion efficiency
Categories
Funding
- National Research Foundation (NRF)
- Korea government (MEST) [2008-05103]
- Korean Center for Artificial Photosyntheis (KCAP)
- Sogang University [NRF-2009-C1AAA001-2009-0093879]
- Ministry of Knowledge Economy (MKE)
- Korea Industrial Technology Foundation (KOTEF)
- National Research Foundation of Korea [2008-05103] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Solid-state dye-sensitized solar cells (DSSCs) have been constructed employing supramolecular electrolytes with multiple hydrogen bonding. A supramolecule was facilely synthesized by one-pot reaction between the amines of methyl isocytosine (MIC) and the epoxy groups of poly(ethylene glycol diglycidyl ether) (PEGDGE) to produce quadruple hydrogen bonding units. Hydrogen bonding interactions and dissolution behavior of salt in supramolecular electrolytes are investigated. The ionic conductivity of the supramolecular electrolytes with ionic liquid, i.e. 1-methyl-3-propylimidazolium iodide (MPII) reaches 8.5 x 10(-5) S/cm at room temperature, which is higher than that with metal salt (KI). A worm-like morphology is observed in the FE-SEM micrographs of TiO2 nanoporous layer, due to the connection of TiO2 nanoparticles resulting from adequate coating by electrolytes. DSSCs employing the supramolecular electrolytes with MPII and KI exhibit an energy conversion efficiency of 2.5% and 0.5%, respectively, at 100 mW/cm(2), indicating the importance of the cation of salt. Solar cell performances were further improved up to 3.7% upon tuning interaction strength in the electrolytes. (C) 2009 Elsevier Ltd. All rights reserved.
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