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Efficient and stable solid-state dye-sensitized solar cells by the combination of phosphonium organic ionic plastic crystals with silica
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posted on 2018-09-26, 00:00 authored by Annkatrin Lennert, Klaudia Wagner, Ruhamah Yunis, Jenny PringleJenny Pringle, Dirk M Guldi, David L OfficerRemarkably efficient quasi-solid-state dye-sensitized solar cells (DSSCs) have been fabricated using organic ionic plastic crystal electrolytes based on a small triethyl(methyl)phosphonium [P1222] cation and two types of sulfonamide anions, bis(fluorosulfonyl)amide (FSA) and bis(trifluoromethanesulfonyl)amide (TFSA), in combination with varying amounts of silica (SiO2). Solar cell efficiencies of up to 7.4% were obtained, which is comparable to our benchmark efficiencies of liquid (acetonitrile) electrolyte-based devices. Such a high efficiency for DSSCs using quasi-solid-state electrolytes is attributed to improved ionic conductivity, enhanced redox couple transport, improved interfacial interaction between the electrolyte and the electrode as well as decreased resistance at both electrode interfaces. Notably, the devices with the silica-containing electrolytes displayed excellent stability after 5 months of storage, with the most stable devices, formed with either plastic crystal electrolyte containing 2% silica, showing no decrease in efficiency.
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Journal
ACS applied materials and interfacesVolume
10Issue
38Pagination
32271 - 32280Publisher
American Chemical SocietyLocation
Washington, D.C.Publisher DOI
eISSN
1944-8252Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2018, American Chemical SocietyUsage metrics
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