Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
The study of organic dyes for p-type dye-sensitized solar cells
KTH, School of Chemical Science and Engineering (CHE), Chemistry, Organic Chemistry. (Licheng Sun´s group)
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis concerns the study of D–π–A type dyes as sensitizers for NiO-based p-type dye-sensitized solar cells. The focus has been on the design and synthesis of efficient dyes and the identification of parameters limiting the solar cell performance.

We have developed a new design strategy for the dyes: upon photoexcitation of the dye, the electron density is moving from the part that is attached to the semiconductor towards the part which is pointing away. This intramolecular charge transfer provides an efficient pathway for the following charge transfer processes. The first organic dye, composed of a triphenylamine (TPA) moiety as the electron-donor, dicyanovinyl groups as the electron-acceptors and linked by thiophene units, showed much better photovoltaic performance than other dyes reported at the same time, turning it into a model for future dye design.

A series of dyes with different energy levels were synthesized and characterized on NiO-based devices using iodide/triiodide as redox couple. Lower photovoltaic performance was obtained for the dye with less negative reduction potential due to the insufficient driving force for dye regeneration. We have investigated the symmetric and unsymmetric structures of the dyes. The breaking of molecular symmetry did not significantly broaden the absorption spectrum, or improve the efficiency. In addition, we have tuned the molecular structure to prevent charge recombination. Increasing the distance between the anchoring group and the electron-acceptor was an effective way to improve the device efficiency. Besides TPA-based compounds, a zinc porphyrin dye was also synthesized and tested in p-type solar cells. However, the solar cell performed less well due to its narrow absorption band and the tendency for aggregation. Co-sensitization of the TPA-based dye with the porphyrin dye did not result in higher photovoltaic performance.

After optimization of the dye structure, the highest overall conversion efficiency was achieved for the P5-sensitized solar cell, based on 1.5 μm NiO film prepared from NiCl2 and the F108 template precursor, and an acetonitrile-based electrolyte.

Place, publisher, year, edition, pages
Stockholm: KTH , 2010. , 72 p.
Series
Trita-CHE-Report, ISSN 1654-1081
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:kth:diva-24406ISBN: 978-91-7415-695-9 (print)OAI: oai:DiVA.org:kth-24406DiVA: diva2:349533
Public defence
2010-09-23, F3, Lindstedtsvägen 26, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100909Available from: 2010-09-09 Created: 2010-09-07 Last updated: 2010-09-09Bibliographically approved
List of papers
1. Double-Layered NiO Photocathodes for p-Type DSSCs with Record IPCE
Open this publication in new window or tab >>Double-Layered NiO Photocathodes for p-Type DSSCs with Record IPCE
Show others...
2010 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 22, no 15, 1759-1762 p.Article in journal (Refereed) Published
Abstract [en]

A way to achieve a high-efficiency dye-sensitized solar cell is to combine an n-type TiO2-based photoanode with a p-type photocathode in a tandem configuration. The development of an efficient photocathode is, at present, the key target. We have optimized the NiO, I-3(-)/I- p-DSSC system to obtain record photocurrent, giving 64% incident photon-to-current conversion efficiency (IPCE) and 5.48 mAcm(-2) J(SC).

National Category
Organic Chemistry
Identifiers
urn:nbn:se:kth:diva-24441 (URN)10.1002/adma.200903151 (DOI)000277369600011 ()2-s2.0-77951192634 (Scopus ID)
Note
QC 20100909Available from: 2010-09-09 Created: 2010-09-09 Last updated: 2017-12-12Bibliographically approved
2. Structural Modifications to Triphenylamine Based Chromophores for Control of Charge Recombination in p-Type Dye-Sensitized Solar Cells
Open this publication in new window or tab >>Structural Modifications to Triphenylamine Based Chromophores for Control of Charge Recombination in p-Type Dye-Sensitized Solar Cells
Show others...
(English)Manuscript (preprint) (Other academic)
Identifiers
urn:nbn:se:kth:diva-24459 (URN)
Note
QC 20100909Available from: 2010-09-09 Created: 2010-09-09 Last updated: 2010-09-09Bibliographically approved
3. High Incident Photon-to-Current Conversion Efficiency of p-Type Dye-Sensitized Solar Cells Based on NiO and Organic Chromophores
Open this publication in new window or tab >>High Incident Photon-to-Current Conversion Efficiency of p-Type Dye-Sensitized Solar Cells Based on NiO and Organic Chromophores
Show others...
2009 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 21, no 29, 2993-2996 p.Article in journal (Refereed) Published
Abstract [en]

The synthesis and characterization of an organic dye, P4, together with its performance in p-type dye-sensitized solar cells (DSSCs) is presented. A solar-cell device based on P4 and an electrolyte that contains the I-/I-3(-) couple in acetonitrile yielded an IPCE value of 44% on a transparent NiO film only 1-1.4 mu m thick, the highest value obtained so far.

Keyword
Chemistry, Multidisciplinary, Chemistry, Physical, Nanoscience & Nanotechnology, Materials Science, Multidisciplinary, Physics, Applied; Physics, Condensed Matter
Identifiers
urn:nbn:se:kth:diva-18695 (URN)10.1002/adma.200802461 (DOI)000269090800007 ()2-s2.0-68149133000 (Scopus ID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
4. Synthesis and Mechanistic Studies of Organic Chromophores with Different Energy Levels for p-Type Dye-Sensitized Solar Cells
Open this publication in new window or tab >>Synthesis and Mechanistic Studies of Organic Chromophores with Different Energy Levels for p-Type Dye-Sensitized Solar Cells
Show others...
2010 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 114, no 10, 4738-4748 p.Article in journal (Refereed) Published
Abstract [en]

A series of donor-pi-acceptor dyes with different electron-withdrawing groups were designed and synthesized for p-type dye-sensitized Solar cells. The modification of dye structures shows significant influence on the photophysical, electrochemical, and photovoltaic performance of the dyes. DSSCs based on these dyes show maximum 63% and minimum 6% of incident monochromatic photon-to-current conversion efficiencies. The two dyes with the highest (P1) and lowest (P3) efficiencies were Studied by femtosecond transient absorption spectroscopy, which shows a fast injection rate of more than (250 fs)(-1) for both dyes. Such fast injection corresponds to more than 90% injection efficiency. The photoinduced absorption Spectroscopy Study of sensitized NiO films in the presence of electrolyte showed poor regeneration of 113 due to all insufficient driving force. This, together with aggregation of the dye on the NiO film, explained the poor solar cell performance.

National Category
Physical Chemistry
Identifiers
urn:nbn:se:kth:diva-19294 (URN)10.1021/jp911091n (DOI)000275328700068 ()2-s2.0-77949448462 (Scopus ID)
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note
QC 20110114Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved
5. Design of an organic chromophore for p-type dye-sensitized solar cells
Open this publication in new window or tab >>Design of an organic chromophore for p-type dye-sensitized solar cells
Show others...
2008 (English)In: Journal of the American Chemical Society, ISSN 0002-7863, E-ISSN 1520-5126, Vol. 130, no 27, 8570-8571 p.Article in journal (Refereed) Published
Abstract [en]

A successful model for the design of efficient dyes for p-type dye-sensitized solar cells (DSSCs) is presented. As an example, a novel and efficient organic dye containing a triphenylamine chromophore has been synthesized and successfully applied in a p-type DSSC. The highest incident photon-to-current conversion efficiency (IPCE) of 18% in the visible region has been obtained, which is the highest value so far in p-type DSSCs. This is remarkably high, considering that only 600 nm thin NiO mesoporous films were used as p-type DSSC electrodes.

Identifiers
urn:nbn:se:kth:diva-17668 (URN)10.1021/ja8001474 (DOI)000257358300002 ()2-s2.0-46949094609 (Scopus ID)
Note

QC 20100525

Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

Open Access in DiVA

fulltext(2083 kB)5755 downloads
File information
File name FULLTEXT01.pdfFile size 2083 kBChecksum SHA-512
4bd2c73092bca444587fefcb4d8e2a26188e30abedde5de089dcfbb66165524a5939734ab60f3b6a8a7ff4a3ccd77c2c048abab7db8a9ec1870b9386e7d5cfeb
Type fulltextMimetype application/pdf

Search in DiVA

By author/editor
Qin, Peng
By organisation
Organic Chemistry
Organic Chemistry

Search outside of DiVA

GoogleGoogle Scholar
Total: 5755 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

isbn
urn-nbn

Altmetric score

isbn
urn-nbn
Total: 570 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf