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Structural Modification of Organic Dyes for Efficient Coadsorbent-Free Dye-Sensitized Solar Cells
KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
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2010 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, no 6, 2799-2805 p.Article in journal (Refereed) Published
Abstract [en]

Three triphenylamine-based organic sensitizers with different electron-donating substituents (butoxyl chains or dimethylamine groups) were examined to investigate the effect of bulky alkoxy donor substituents on the photovoltaic performances of dye-sensitized solar cells (DSCs) in the presence and absence of the coadsorbent chenodeoxycholic acid (CDCA) in dye-bath solutions. The study showed that, using the D29 dye without bulky alkoxy substituents, the power conversion efficiency of DSC was significantly increased by about 84% in the presence of CDCA as compared to that in the absence of CDCA addition during the sensitization. However, the photovoltaic performance of D35-sensitized DSC having four bulky butoxyl substituents was not dependent on CDCA at all, probably due to the inherent structural nature of the D35 molecule. The DSC based on the D37 sensitizer with only two bulky butoxyl chains displayed an expected medium performance as compared to D29 and D35. The inclusion of bulky alkoxy electron-donating substituents in dye molecules for efficient DSCs suppressed the electron recombination and reduced the interactions between dye molecules. This emphasizes the importance of designing novel dyes including functional groups that incorporate the properties normally needed from an external coadsorbent. The development of a coadsorbent free system is in particular important for the future economization and simplification of the DSCs' assembly process.

Place, publisher, year, edition, pages
2010. Vol. 114, no 6, 2799-2805 p.
Keyword [en]
nanocrystalline tio2 films; interfacial electron-transfer; near-ir sensitization; open-circuit voltage; highly efficient; molecular photovoltaics; conversion-efficiency; energy conversion; coumarin dyes; tetrahydroquinoline dyes
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-14289DOI: 10.1021/jp908552tISI: 000274354800059Scopus ID: 2-s2.0-77249111942OAI: oai:DiVA.org:kth-14289DiVA: diva2:332030
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
QC 20110124Available from: 2010-07-30 Created: 2010-07-30 Last updated: 2017-12-12Bibliographically approved
In thesis
1. Photoelectrochemical studies of dye-sensitized solar cells using organic dyes
Open this publication in new window or tab >>Photoelectrochemical studies of dye-sensitized solar cells using organic dyes
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The dye-sensitized solar cell (DSC) is a promising efficient low-cost molecular photovoltaic device. One of the key components in DSCs is the dye, as it is responsible for the capture of sunlight.

State-of-the-art DSC devices, based on ruthenium dyes, show record efficiencies of 10-12 %. During the last decade, metal-free organic dyes have been extensively explored as sensitizers for DSC application. The use of organic dyes is particularly attractive as it enables easy structural modifications, due to fairly short synthetic routes and reduced material cost. Novel dye should in addition to the light-harvesting properties also be compatible with the DSC components.

In this thesis, a series of new organic dyes are investigated, both when integrated in the DSC device and as individual components. The evaluation methods consisted of different electrochemical and photoelectrochemical techniques. Whereas the light-harvesting properties of the dyes were fairly easily improved, the behavior of the dye integrated in the DSC showed less predictable photovoltaic results.

The dye series studied in Papers II and IV revealed that their dye energetics limited vital electron-transfer processes, the dye regeneration (Paper II) and injection quantum yield (Paper IV). Further, in Papers III-VI, it was observed that different dye structures seemed to alter the interfacial electron recombination with the electrolyte. In addition to the dye structure sterics, some organic dyes appear to enhance the interfacial recombination, possibly due to specific dye-redox acceptor interaction (Paper V).

The impact of dye sterical modifications versus the use of coadsorbent was explored in Paper VI. The dye layer properties in the presence and absence of various coadsorbents were further investigated in Paper VII.

The core of this thesis is the identification of the processes and properties limiting the performance of the DSC device, aiming at an overall understanding of the compatibility between the DSC components and novel organic dyes.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. 84 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2009 : 50
Keyword
additive, charge recombination, coadsorbent, conduction band shift, dye-sensitized, electron lifetime, electron-transfer, organic dye, photoelectrochemical, photovoltaic, sensitizer, semiconductor, solar cell, solar cell efficiency, titanium dioxide
National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-11248 (URN)978-91-7415-461-0 (ISBN)
Public defence
2009-10-30, F3, Lindstedtsvägen 26, KTH, Stcokholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100730Available from: 2009-10-14 Created: 2009-10-09 Last updated: 2010-07-30Bibliographically approved

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