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Interfacial Properties of Photovoltaic TiO2/dye/PEDOT-PSS Heterojunctions
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics I.
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2005 (English)In: Synthetic metals, ISSN 0379-6779, E-ISSN 1879-3290, Vol. 149, no 2-3, 157-167 p.Article in journal (Refereed) Published
Abstract [en]

Systems comprising a dense TiO2 film electrode, a ruthenium polypyridine dye and a PEDOT–PSS(poly(3,4-ethylenedioxythiophene)–poly(4-styrenesulphonate)) film were prepared. The heterojunctions were shown to have photovoltaicproperties, with the dye absorbing the light, the TiO2 acting as an electron conducting material and PEDOT–PSS acting as a hole transport material. A series of dyes was used to investigate their influence on the photocurrent and the photovoltage characteristics of the heterojunction. These results were compared to a photoelectrochemical system in which the PEDOT–PSS was replaced by a liquid electrolyte containing triiodide/iodide redox-couple.

Photoelectron spectroscopy (PES) was used to monitor the interfacialproperties of the heterojunction and the investigation points out effects of importance when assembling the materials together to a functional unit. Specifically, it was concluded that the interaction with the dye clearly affects the structure ofPEDOT–PSS, both with respect to the surface composition of PSS relative to PEDOT and with respect to the chemical state of the sulphur in the polymers. Moreover, a comparison of the Ru3d and the valence band spectra of the two different interfaces (dye/TiO2 and dye/PEDOT–PSS) indicates that the energy level structure of the dyes compared to the substrate is different for the two surfaces. Thus, in the combined energy level picture under dark conditions, the energy levels in TiO2 relative to the energy levels inPEDOT–PSS depend on the dye.

Place, publisher, year, edition, pages
2005. Vol. 149, no 2-3, 157-167 p.
National Category
Physical Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-94532DOI: 10.1016/j.synthmet.2004.12.004OAI: oai:DiVA.org:uu-94532DiVA: diva2:168409
Available from: 2006-05-08 Created: 2006-05-08 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Interfaces in Dye-Sensitized Oxide / Hole-Conductor Heterojunctions for Solar Cell Applications
Open this publication in new window or tab >>Interfaces in Dye-Sensitized Oxide / Hole-Conductor Heterojunctions for Solar Cell Applications
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Nanoporous dye-sensitized solar cells (DSSC) are promising devices for solar to electric energy conversion. In this thesis photoelectron spectroscopy (PES), x-ray absorption spectroscopy (XAS) and photovoltaic measurements are used for studies of the key interfaces in the DSSC.

Photovoltaic properties of new combinations of TiO2/dye/hole-conductor heterojunctions were demonstrated and their interfacial structures were studied. Three different types of hole-conductor materials were investigated: Triarylamine derivatives, a conducting polymer and CuI. The difference in photocurrent and photovoltage properties of the heterojunction due to small changes in the hole-conductor material was followed. Also a series of dye molecules were used to measure the influence of the dye on the photovoltaic properties. Differences in both the energy-level matching and the geometric structure of the interfaces in the different heterojunctions were studied by PES. This combination of photovoltaic and PES measurements shows the possibility to link the interfacial electronic and molecular structure to the functional properties of the device.

Three effective dyes used in the DSSC, Ru(dcbpy)2(NCS)2, Ru(tcterpy)(NCS)3 and an organic dye were studied in detail using PES and XAS and resonant core hole decay spectroscopy. The results gave information of the frontier electronic structure of the dyes and how the dyes are bonded to the TiO2 surface.

Finally, the hole-conductor mechanism in a conducting polymer was investigated theoretically using semi-empirical and ab-initio methods.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 53 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 188
Keyword
Physics, Photoelectron spectroscopy, Solar cells, Heterojunction, Fysik
Identifiers
urn:nbn:se:uu:diva-6892 (URN)91-554-6575-7 (ISBN)
Public defence
2006-05-29, Polhemsalen, Ångströmlaboratoriet, Lägerhyddsv.1, Uppsala, 13:15
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Available from: 2006-05-08 Created: 2006-05-08 Last updated: 2012-10-09Bibliographically approved

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Johansson, Erik M .J.Rensmo, HåkanBoschloo, GerritHagfeldt, Anders

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