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Synergistic Effect of N-Methylbenzimidazole and Guanidinium Thiocyanate on the Performance of Dye-Sensitized Solar Cells Based on Ionic Liquid Electrolytes
KTH, Skolan för kemivetenskap (CHE), Kemi, Oorganisk kemi (stängd 20110630).
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
KTH, Skolan för kemivetenskap (CHE), Kemi, Oorganisk kemi (stängd 20110630).
2010 (Engelska)Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, nr 50, s. 22330-22337Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The effects of additives guanidinium thiocyanate (GSCN) and N-methylbenzimidazole (MBI) on the photovoltaic performance of dye-sensitized solar cells based on low-viscous, binary ionic liquid and organic liquid electrolytes were investigated. Addition of only GSCN to the electrolyte has a pronounced influence on the short-circuit current, owing largely to the positive shift of the conduction band edge potential, probably increasing the injection efficiency of the excited dye. When only MBI was added to the electrolyte, a significant improvement of the open-circuit voltage was found, which could be attributed to a negative shift of the TiO2 conduction band edge potential and a longer electron lifetime under open-circuit conditions. Synergistic effects were observed when GSCN and MBI were used together in the ionic liquid-based electrolyte. In this case, optimal open-circuit voltage and total conversion efficiency were obtained among the ionic liquid electrolytes studied mainly due to the more efficient retardation of the recombination loss reaction at the TiO2/electrolyte interface.

Ort, förlag, år, upplaga, sidor
2010. Vol. 114, nr 50, s. 22330-22337
Nyckelord [en]
band-edge movement, charge recombination, tio2, efficiency, conversion, molten, light, salts, power
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-28590DOI: 10.1021/jp1073686ISI: 000285236800060Scopus ID: 2-s2.0-79951629346OAI: oai:DiVA.org:kth-28590DiVA, id: diva2:388225
Forskningsfinansiär
VetenskapsrådetKnut och Alice Wallenbergs StiftelseStandUp
Anmärkning

QC 20150720

Tillgänglig från: 2011-01-17 Skapad: 2011-01-17 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
Ingår i avhandling
1. Liquid Redox Electrolytes for Dye-Sensitized Solar Cells
Öppna denna publikation i ny flik eller fönster >>Liquid Redox Electrolytes for Dye-Sensitized Solar Cells
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis focuses on liquid redox electrolytes in dye-sensitized solar cells (DSCs). A liquid redox electrolyte, as one of the key constituents in DSCs, typically consists of a redox mediator, additives and a solvent. This thesis work concerns all these three aspects of liquid electrolytes, aiming through fundamental insights to enhance the photovoltaic performances of liquid DSCs.

Initial attention has been paid to the iodine concentration effects in ionic liquid (IL)-based electrolytes. It has been revealed that the higher iodine concentration required in IL-based electrolytes can be attributed to both triiodide mobility associated with the high viscosity of the IL, and chemical availability of triiodide. The concept of incompletely solvated ionic liquids (ISILs) has been introduced as a new type of electrolyte solvent for DSCs. It has been found that the photovoltaic performance of ISIL-based electrolytes can even rival that of organic solvent-based electrolytes. And most strikingly, ISIL-based electrolytes provide highly stable DSC devices under light-soaking conditions, as a result of the substantially lower vapor pressure of the ISIL system. A significant synergistic effect has been observed when both guanidinium thiocyanate and N-methylbenzimidazole are employed together in an IL-based electrolyte, exhibiting an optimal overall conversion efficiency.

Tetrathiafulvalene (TTF) has been investigated as an organic iodine-free redox couple in electrolytes for DSCs. An unexpected worse performance has been observed for the TTF system, albeit it possesses a particularly attractive positive redox potential. An organic, iodine-free thiolate/disulfide system has also been adopted as a redox couple in electrolytes for organic DSCs. An impressive efficiency of 6.0% has successfully been achieved by using this thiolate/disulfide redox couple in combination with a poly (3, 4-ethylenedioxythiophene) (PEDOT) counter electrode material under full sunlight illumination (AM 1.5G, 100 mW/cm2). Such high efficiency can even rival that of its counterpart DSC using a state-of-the-art iodine-based electrolyte in the systems studied.The cation effects of lithium, sodium and guanidinium ions in liquid electrolytes for DSCs have been scrutinized. The selection of the type of cations has been found to exert quite different impacts on the conduction band edge (CB) of the TiO2 and also on the electron recombination kinetics, therefore resulting in different photovoltaic behavior.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. s. 60
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2012:2
Nyckelord
dye-sensitized solar cells, electrolytes, ionic liquids, redox couples, additives
Nationell ämneskategori
Oorganisk kemi
Identifikatorer
urn:nbn:se:kth:diva-64139 (URN)978-91-7501-231-5 (ISBN)
Disputation
2012-02-16, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (Finska)
Opponent
Handledare
Anmärkning
QC 20120124Tillgänglig från: 2012-01-24 Skapad: 2012-01-24 Senast uppdaterad: 2012-01-24Bibliografiskt granskad

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Yu, ZeGorlov, MikhailKloo, Lars
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Oorganisk kemi (stängd 20110630)Organisk kemi
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