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Symmetric and Unsymmetric Donor Functionalization. Comparing Structural and Spectral Benefits of Chromophores for Dye Sensitized Solar Cells.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Licheng Sun)
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry.
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry.ORCID iD: 0000-0003-2673-075X
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2009 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 19, 7232-7238 p.Article in journal (Refereed) Published
Abstract [en]

 

A series of organic chromophores have been synthesized in order to investigate the benefits of structural versus spectral properties as well as the absorption properties and solar cell performance when introducing unsymmetrical substituents in the chromophore. Exceptionally high Voc was found for the symmetrical, structural benefited dye, which also gave the best overall solar cell performance.

 

Place, publisher, year, edition, pages
2009. Vol. 19, 7232-7238 p.
Keyword [en]
EFFICIENT MOLECULAR PHOTOVOLTAICS; NANOCRYSTALLINE TIO2 ELECTRODES; ORGANIC-DYES; HIGHLY EFFICIENT; PERFORMANCE; CONVERSION; DESIGN; LIGHT; DERIVATIVES; ACID
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-10546DOI: 10.1039/b911397pISI: 000270382400011Scopus ID: 2-s2.0-70349789520OAI: oai:DiVA.org:kth-10546DiVA: diva2:219038
Note
QC 20100716Available from: 2009-05-26 Created: 2009-05-26 Last updated: 2014-05-09Bibliographically approved
In thesis
1. Synthesis of Organic Chromophores for Dye Sensitized Solar Cells.
Open this publication in new window or tab >>Synthesis of Organic Chromophores for Dye Sensitized Solar Cells.
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

 

This thesis deals with development and synthesis of organic chromophores for dye sensitized solar cells. The chromophores are divided into three components; donor, linker and acceptor.

The development of efficient organic chromophores for dye sensitized solar cells starts off with one new organic chromophore, D5. This chromophore consists of a triphenylamine moiety as an electron donor, a conjugated linker with a thiophene moiety and cyanoacrylic acid as an electron acceptor and anchoring group. Alternating the donor, linker or acceptor moieties independently, would give us the tool to tune the HOMO and LUMO energy levels of the chromophores. The following parts of this thesis regard this development strategy.

The contributions to the HOMO and LUMO energy levels were investigated when alternating the linker moiety. Unexpected effects of the solar cell performances when increasing the linker length were revealed, however.

In addition, the effect of an alternative acceptor group, rhodanine-3-acetic acid, in combination with different linker lengths was investigated. The HOMO and LUMO energy level tuning was once again successful. Electron recombination from the semiconductor to the electrolyte is probably the cause of the poor efficiencies obtained for this series of dyes.

Finally, the development of functionalized triphenylamine based donors and the contributions from different substituents to the HOMO and LUMO energy levels and as insulating layers were investigated. This strategy has so far been the most successful in terms of reaching high efficiencies in the solar cell. A top overall efficiency of 7.79 % was achieved.

 

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. 73 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2009:18
Keyword
Acceptor, chromophore, donor, dye sensitized solar cells, HOMO and LUMO energy level tuning, linker, organic dye.
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-10547 (URN)978-91-7415-328-6 (ISBN)
Public defence
2009-08-28, F3, KTH, Lindstedtsvägen 26, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100716Available from: 2009-06-12 Created: 2009-05-26 Last updated: 2010-07-16Bibliographically approved
2. 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.
Series
TRITA-CHE-Report, ISSN 1654-1081 ; 20
Keyword
Dye-sensitized solar cells, Molecular electronics, Molecular engineering, Organic synthesis, Photovoltaics
National Category
Organic Chemistry
Research subject
Chemistry
Identifiers
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)
Opponent
Supervisors
Funder
Swedish Energy AgencySwedish Research CouncilKnut and Alice Wallenberg FoundationEU, FP7, Seventh Framework Programme, 246124StandUp
Note

QC 20140509

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

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