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Incompletely solvated ionic liquid mixtures as electrolyte solvents for highly stable dye-sensitized solar cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Applied Physical Chemistry.
2013 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 3, no 6, 1896-1901 p.Article in journal (Refereed) Published
Abstract [en]

Ionic liquids have been intensively investigated as alternative stable electrolyte solvents for dye-sensitized solar cells (DSCs). A highest overall conversion efficiency of over 8% has been achieved using a ionic-liquid-based electrolyte in combination with an iodide/triiodide redox couple. However, the relatively high viscosities of ionic liquids require higher iodine concentration in the electrolyte due to mass-transport limitations of the triiodide ions. The higher iodine concentration significantly reduces the photovoltaic performance, which normally are lower than those using organic solvent-based electrolytes. Here, the concept of incompletely solvated ionic liquid mixtures (ISILMs) is introduced and represents a conceptually new type of electrolyte solvent for DSCs. It is found that the photovoltaic performance of ISILM-based electrolytes can rival that of organic solvent-based electrolytes. Furthermore, the vapor pressures of ISILMs are found to be considerably lower than that for pure organic solvents. Stability tests show that ISILM-based electrolytes provide highly stable DSCs under light soaking conditions. Thus, ISILM-based electrolytes offer a new platform to develop more efficient and stable DSC devices of relevance to future large-scale applications.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2013. Vol. 3, no 6, 1896-1901 p.
Keyword [en]
Efficiency, Performance, Molten, Recombination, 50-Degrees-C, Polyiodides, Conversion, Stability, Transport, Systems
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-118254DOI: 10.1039/c2ra22330aISI: 000313513400044Scopus ID: 2-s2.0-84872292484OAI: oai:DiVA.org:kth-118254DiVA: diva2:605383
Funder
Swedish Research CouncilKnut and Alice Wallenberg FoundationSwedish Energy Agency
Note

QC 20130214

Available from: 2013-02-14 Created: 2013-02-14 Last updated: 2017-12-06Bibliographically approved

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