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Light Induced Damage in Poly(3,4-ethylenedioxythiophene) and its Derivatives Studied by Photoelectron Spectroscopy
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-8845-6296
Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics. Linköping University, The Institute of Technology.
Institute of Mathematics and Physics, Bydgoszcz, Poland.
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2004 (English)In: Synthetic metals, ISSN 0379-6779, Vol. 141, no 1-2, 67-73 p.Article in journal (Refereed) Published
Abstract [en]

Poly(3,4-ethylenedioxythiophene), usually known as PEDOT, and derivatives have attracted significant interest because of their high electrical conductivity. This electric property, however, deteriorates upon exposure to solar radiation. X-ray photoelectron spectroscopy (XPS) has been used to study the UV-light-induced chemical changes in doped PEDOT, as well as in both neutral and doped forms of its alkylated derivative—PEDOT-C14H29. Analysis of the XPS data indicates an oxidation of the sulfur in the thiophene ring. Apparently, photo-oxidation leads to the formation of sulfon groups, SO2, resulting in a disruption of π-conjugation in PEDOT, which there by diminishes the conductivity of the organic layer. This hypothesis is supported by the results of a study of model molecules for pristine and the oxidized PEDOT unit: 3,4 ethylenedioxythiophene (EDOT) and 3,4 ethylenedioxythiophene and S-dioxide (EDOT-SO2), respectively.

Place, publisher, year, edition, pages
Elsevier, 2004. Vol. 141, no 1-2, 67-73 p.
Keyword [en]
Poly(3, 4-ethylenedioxythiophene), X-ray photoelectron spectroscopy, Degradation, Photo-oxidation, Sulfon
National Category
Materials Chemistry
URN: urn:nbn:se:liu:diva-14580DOI: 10.1016/j.synthmet.2003.08.017ISI: 000220273400012OAI: diva2:23941
Available from: 2007-07-03 Created: 2007-07-03 Last updated: 2015-03-20Bibliographically approved
In thesis
1. Studies of Materials and Interfaces for Organic Electronics
Open this publication in new window or tab >>Studies of Materials and Interfaces for Organic Electronics
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic electronics is a rapidly evolving field with vast number of applications having high potential for commercial success. Although a great progress has been made, many organic electronic applications: organic light-emitting diodes (OLEDs), organic fieldeffect transistors (OFETs), organic solar cells, etc; still require further optimization to fulfill the requirements for successful commercialization. For many applications, available at this time organic materials do not provide satisfactory performance and stability, which hinders the possibility of a large-scale production. Therefore, the key ingredient needed for a successful improvement in performance and stability of organic electronic devices is in-depth knowledge of physical and chemical properties of molecular and polymeric materials. Since many applications encompass several thin film layers made of organics, and often also inorganic materials, the understanding of both organic-organic and hybrid interfaces is yet another important issue necessary for the successful development of organic electronics.

The research presented in this thesis is based mainly on photoelectron spectroscopy, which is an experimental technique especially suited to study both surfaces and interfaces of materials. In the thesis, the properties of one of the most successful polymeric materials, poly(3,4-ethylenedioxythiophene), often abbreviated as PEDOT, have been extensively studied. The research was done in close cooperation with an industrial partner – AGFA Gevaert, Belgium. The study was focused on the exploration of the intrinsic properties of the material, such as stability, morphology and conductivity. In addition, however, a possibility of alternation of these properties was also explored. This thesis reports also about investigations of the properties of various organic-organic and hybrid interfaces. The energy level alignment at such interfaces plays important role in charge injection and performance of the thin film organic-based devices. The conditions for different energy level alignment regimes at the various interfaces have been studied. The studies on interfaces were performed in close collaboration with the R&D division of DuPont Corporation, USA. This work led to the significant advances in understanding of the interface energetics and properties of industryrelevant organic materials, as represented not only by published scientific papers, but also patent applications.

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi, 2007
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1103
Organic electronic, Polymeric materials, Organic light-emitting diodes (OLEDs), Organic fieldeffect transistors (OFETs), Organic solar cells
National Category
Other Engineering and Technologies not elsewhere specified
urn:nbn:se:liu:diva-9488 (URN)978-91-85831-94-4 (ISBN)
Public defence
2007-06-08, Plank, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Available from: 2007-07-03 Created: 2007-07-03 Last updated: 2009-04-23

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