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Rhodanine Dyes for Dye Sensitized Solar Cells: Spectroscopy, Energy Levels and Photovoltaic Performance
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Licheng Sun)
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry (closed 20110630).
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry (closed 20110630).
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Physical Chemistry (closed 20110630).
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2009 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 11, 133-141 p.Article in journal (Refereed) Published
Abstract [en]

Three new sensitizers for photoelectrochemical solar cells were synthesized consisting of a triphenylamine donor, a rhodanine-3-acetic acid acceptor and a polyene connection. The conjugation length was systematically increased, which resulted in two effects: first, it led to a red-shift of the optical absorption of the dyes, resulting in an improved spectral overlap with the solar spectrum. Secondly, the oxidation potential decreased systematically. The excited state levels were, however, calculated to be nearly stationary. The experimental trends were in excellent agreement with density functional theory (DFT) computations. The photovoltaic performance of this set of dyes as sensitizers in mesoporous TiO2 solar cells was investigated using electrolytes containing the iodide/triiodide redox couple. The dye with the best absorption characteristics showed the poorest solar cell efficiency, due to losses by recombination of electrons in TiO2 with triiodide. Addition of 4-tert butylpyridine to the electrolyte led to a strongly reduced photocurrent for all dyes due to a reduced electron injection efficiency, caused by a 0.15 V negative shift of the TiO2 conduction band potential.

Place, publisher, year, edition, pages
Cambridge: RSC Publishing , 2009. Vol. 11, 133-141 p.
Keyword [en]
Solar Cells
National Category
Chemical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-10529DOI: 10.1039/b812154kISI: 000263278900011Scopus ID: 2-s2.0-57449121558OAI: oai:DiVA.org:kth-10529DiVA: diva2:218884
Note

QC 20150724

Available from: 2009-05-25 Created: 2009-05-25 Last updated: 2017-12-13Bibliographically 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. 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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