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Journal Article
A New Ionic Liquid for a Redox Electrolyte of Dye-Sensitized Solar Cells
- Authors
- Man Gu Kang, Kwang Sun Ryu, Soon Ho Chang, Nam-Gyu Park
- Issue Date
- 2004-12
- Citation
- ETRI Journal, v.26, no.6, pp.647-652
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- A new ionic liquid, 1-vinyl-3-heptylimidazolium iodide(VHpII), was synthesized and applied as a redoxelectrolyte for dye-sensitized solar cells. The chemicalstructure of the synthesized VHpII was confirmed using1H NMR. Thermogravimetric analysis showed that theVHpII was stable for thermal stress of up to 250˚C. Theenergy conversion efficiencies of the VHpII-based dyesensitizedsolar cells were investigated in terms of theeffect of a lithium iodide addition. A solar cell containingthe redox couple of VHpII and iodine showed aconversion efficiency of 2.63% under 1 sun light intensityat AM 1.5. Adding 0.4 M LiI results in a conversionefficiency of 3.63%, which was an improvement of about40%. The increased conversion efficiency was ascribed toan increase in external quantum efficiency.
- KSP Keywords
- Conversion efficiency(C.E.), Dye-sensitized solar cells(DSCs), External Quantum Efficiency, H NMR, Lithium iodide, Redox couple, Redox electrolyte, Sun light, Thermogravimetric analysis(TG), ionic liquids(Poly), thermal stress