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Phenoxazine Dyes for Dye-Sensitized Solar Cells: Relationship Between Molecular Structure and Electron Lifetime.
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi. KTH, Skolan för kemivetenskap (CHE), Centra, Molekylär elektronik, CMD.ORCID-id: 0000-0003-1771-9401
KTH, Skolan för kemivetenskap (CHE), Kemi, Oorganisk kemi. KTH, Skolan för kemivetenskap (CHE), Centra, Molekylär elektronik, CMD.
KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi. KTH, Skolan för kemivetenskap (CHE), Centra, Molekylär elektronik, CMD.
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2011 (Engelska)Ingår i: Chemistry - A European Journal, ISSN 0947-6539, E-ISSN 1521-3765, Vol. 17, nr 23, s. 6415-6424Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A series of metal-free organic dyes with a core phenoxazine chromophore have been synthesized and tested as sensitizers in dye-sensitized solar cells. Overall conversion efficiencies of 6.03-7.40 % were reached under standard AM 1.5G illumination at a light intensity of 100 mW cm(-2) . A clear trend in electron lifetime could be seen; a dye with a furan-conjugated linker showed a shorter lifetime relative to dyes with the acceptor group directly attached to the phenoxazine. The addition of an extra donor unit, which bore insulating alkoxyl chains, in the 7-position of the phenoxazine could increase the lifetime even further and, together with additives in the electrolyte to raise the conduction band, an open circuit voltage of 800 mV could be achieved. From photoelectron spectroscopy and X-ray absorption spectroscopy of the dyes adsorbed on TiO(2) particles, it can be concluded that the excitation is mainly of cyano character (i.e., on average, the dye molecules are standing on, and pointing out, from the surface of TiO(2) particles).

Ort, förlag, år, upplaga, sidor
2011. Vol. 17, nr 23, s. 6415-6424
Nationell ämneskategori
Kemi
Identifikatorer
URN: urn:nbn:se:kth:diva-33339DOI: 10.1002/chem.201003730ISI: 000292095800018PubMedID: 21509836Scopus ID: 2-s2.0-79958204045OAI: oai:DiVA.org:kth-33339DiVA, id: diva2:414533
Anmärkning
Updated from submitted to published. QC 20110711Tillgänglig från: 2011-05-03 Skapad: 2011-05-03 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
Ingår i avhandling
1. Design, Synthesis and Properties of Organic Sensitizers for Dye Sensitized Solar Cells
Öppna denna publikation i ny flik eller fönster >>Design, Synthesis and Properties of Organic Sensitizers for Dye Sensitized Solar Cells
2011 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis gives a detailed description of the design and synthesis of new organic sensitizers for Dye sensitized Solar Cells (DSCs). It is divided in 7 chapters, where the first gives an introduction to the field of DSCs and the synthesis of organic sensitizers. Chapters 2 to 6 deal with the work of the author, starting with the first publication and the other following in chronological order. The thesis is completed with some concluding remarks (chapter 7).

The DSC is a fairly new solar cell concept, also known as the Grätzel cell, after its inventor Michael Grätzel. It uses a dye (sensitizer) to capture the incident light. The dye is chemically connected to a porous layer of a wide band-gap semiconductor. The separation of light absorption and charge separation is different from the conventional Si-based solar cells. Therefore, it does not require the very high purity materials necessary for the Si-solar cells. This opens up the possibility of easier manufacturing for future large scale production. Since the groundbreaking work reported in 1991, the interest within the field has grown rapidly. Large companies have taken up their own research and new companies have started with their focus on the DSC. So far the highest solar energy to electricity conversion efficiencies have reached ~12%.

The sensitizers in this thesis are based on triphenylamine or phenoxazine as the electron donating part in the molecule. A conjugated linker allows the electrons to flow from the donor to the acceptor, which will enable the electrons to inject into the semiconductor once they are excited. Changing the structure by introducing substituents, extending the conjugation and exchanging parts of the molecule, will influence the performance of the solar cell. By analyzing the performance, one can evaluate the importance of each component in the structure and thereby gain more insight into the complex nature of the dye sensitized solar cell.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2011. s. 80
Serie
Trita-CHE-Report, ISSN 1654-1081 ; 2011:31
Nyckelord
Acceptor, chromophore, donor, dye, sensitized, energy level, HOMO/LUMO, linker, phenoxazine, sensitizer, solar cell, triphenylamine
Nationell ämneskategori
Kemi Organisk kemi
Identifikatorer
urn:nbn:se:kth:diva-33190 (URN)978-91-7415-954-7 (ISBN)
Disputation
2011-05-20, K2, Teknikringen 28, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20110505Tillgänglig från: 2011-05-05 Skapad: 2011-04-29 Senast uppdaterad: 2011-09-08Bibliografiskt granskad

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