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Convergent/Divergent Synthesis of a Linker-Varied Series of Dyes for Dye-Sensitized Solar Cells Based on the D35 Donor
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. KTH, School of Chemical Science and Engineering (CHE), Centres, Centre of Molecular Devices, CMD.
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2013 (English)In: Advanced Energy Materials, ISSN 1614-6832, Vol. 3, no 12, 1647-1656 p.Article in journal (Refereed) Published
Abstract [en]

A series of four new dyes, based on the D35 type donor moiety with varied linker units, is synthesized using a facile convergent/divergent method, enabled by an improved synthesis of the D35 donor. The dyes are evaluated in dye sensitized solar cells with Co(II/III)(bpy)(3)-based electrolytes. By extending the linker fragment, higher photocurrents and solar energy conversion efficiencies are achieved. It is also found that the linker unit plays a crucial role in maintaining a high open-circuit photovoltage. Based on the photovoltaic performance it is concluded that the hexylthiophene unit is the most suitable for this purpose, as it allows further enhancement of the already high open-circuit voltage of D35 to 0.92 V. The best dye in this series reaches an efficiency of 6.8%.

Place, publisher, year, edition, pages
2013. Vol. 3, no 12, 1647-1656 p.
Keyword [en]
synthesis, organic dyes, solar cells, dye-sensitized solar cells
National Category
Other Chemistry Topics
URN: urn:nbn:se:kth:diva-140153DOI: 10.1002/aenm.201300367ISI: 000328337500017ScopusID: 2-s2.0-84890127554OAI: diva2:689519
Knut and Alice Wallenberg FoundationSwedish Energy AgencySwedish Research Council

QC 20140121

Available from: 2014-01-21 Created: 2014-01-17 Last updated: 2014-05-09Bibliographically approved
In thesis
1. Molecular Engineering of D-π-A Dyes for Dye-Sensitized Solar Cells
Open this publication in new window or tab >>Molecular Engineering of D-π-A Dyes for Dye-Sensitized Solar Cells
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dye-sensitized solar cells (DSSCs) present an interesting method for the conversion of sunlight into electricity. Unlike in other photovoltaic technologies, the difficult tasks of light absorption and charge transport are handled by two different materials in DSSCs. At the heart of the DSSC, molecular light absorbers (dyes) are responsible for converting light into current.

In this thesis the design, synthesis and properties of new metal-free D-π-A dyes for dye-sensitized solar cells will be explored. The thesis is divided into six parts:

Part one offers a general introduction to DSSCs, dye design and device characterization.

Part two is an investigation of a series of donor substituted dyes where structural benefits are compared against electronic benefits.

In part three a dye assembly consisting of a chromophore tethered to two electronically decoupled donors is described. The assembly, capable of intramolecular regeneration, is found to impede recombination.

Part four explores a method for rapidly synthesizing new D-π-A dyes by dividing them into donor, linker and acceptor fragments that can be assembled in two simple steps. The method is applied to synthesize a series of linker varied dyes for cobalt based redox mediators that builds upon the experience from part two.

Part five describes the synthesis of a bromoacrylic acid based dye and explores the photoisomerization of a few bromo- and cyanoacrylic acid based dyes.

Finally, in part six the experiences from previous chapters are combined in the design and synthesis of a D-π-A dye bearing a new pyridinedicarboxylic acid acceptor and anchoring group.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. 66 p.
TRITA-CHE-Report, ISSN 1654-1081 ; 20
Dye-sensitized solar cells, Molecular electronics, Molecular engineering, Organic synthesis, Photovoltaics
National Category
Organic Chemistry
Research subject
urn:nbn:se:kth:diva-144874 (URN)978-91-7595-124-9 (ISBN)
Public defence
2014-05-23, F3, Lindstedtsvägen 26, KTH, Stockholm, 14:00 (English)
Swedish Energy AgencySwedish Research CouncilKnut and Alice Wallenberg FoundationEU, FP7, Seventh Framework Programme, 246124StandUp

QC 20140509

Available from: 2014-05-09 Created: 2014-04-30 Last updated: 2014-05-09Bibliographically approved

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Gabrielsson, ErikTian, HainingSun, Licheng
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