Investigation of Iodine Concentration Effects in Electrolytes for Dye-Sensitized Solar Cells
2010 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, no 23, 10612-10620 p.Article in journal (Refereed) Published
The present work describes the effects of different iodine concentrations and iodine-to-iodide ratios in electrolytes for dye-sensitized solar cells based on low-viscous, binary ionic liquid and organic liquid solvents. Current-voltage characteristics, photoelectrochemical measurements, electrochemical impedance spectroscopy, and Raman spectroscopy were used for characterization. Optimal short-circuit current and overall conversion efficiency were achieved using intermediate and low iodine concentration in ionic liquid-based and acetonitrile-based electrolytes, respectively. Results from photoelectrochemical and Raman-spectroscopic measurements reveal that both triiodide mobility and chemical availability affect the optimal iodine concentration required in these two types of electrolytes. The higher iodine concentrations required for the ionic liquid-based electrolytes partly compensate for these effects, although negative effects from higher recombination losses and light absorption of iodine-containing species start to become significant.
Place, publisher, year, edition, pages
2010. Vol. 114, no 23, 10612-10620 p.
Chemical availability, Dye-Sensitized solar cell, Iodine concentration, Organic liquid, Overall conversion efficiency, Photoelectrochemical measurements, Photoelectrochemicals, Recombination loss, Spectroscopic measurements, Triiodide, Acetonitrile, Concentration (process), Conversion efficiency, Current voltage characteristics, Electrochemical corrosion, Electrochemical impedance spectroscopy, Electrolytes, Fused silica, Industrial chemicals, Iodine, Ionic liquids, Ions, Optimization, Photoelectrochemical cells, Raman spectroscopy, Solar cells, Switching circuits
IdentifiersURN: urn:nbn:se:kth:diva-27506DOI: 10.1021/jp1001918ISI: 000278479700040ScopusID: 2-s2.0-77953510497OAI: oai:DiVA.org:kth-27506DiVA: diva2:386092
QC 201101122011-01-122010-12-132016-05-02Bibliographically approved