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Organic electronic switch devices
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2006 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Since the discovery of conducting polymers three decades ago the field of organic electronics has evolved rapidly. Organic light emitting diodes have already reached the consumer market, while organic solar cells and transistors are rapidly maturing. One of the great benefits with this class of materials is that they can be processed from solution. This enables several very cheap production methods, such as printing and spin coating, and opens up the possibility to use unconventional substrates, such as flexible plastic foils and paper. Another great benefit is the possibility of tailoring the molecules through carefully controlled synthesis, resulting in a multitude of different functionalities. This is very interesting for nano applications, where devices are made of a small number of molecules or even a single molecule, and were the molecules can be designed to self-assembly.

This thesis reports how charge transport can be altered in solid-state organic electronic devices. This is done from both a dynamic perspective, as in impedance switch devices, and from a static perspective, as in the modification of electrode properties to improve charge injection. The first six chapters give a brief review of the field of solid-state organic electronics, with focus on electronic properties, impedance switch mechanisms and architecture.

Paper I and III treat Rose Bengal switch devices in detail- how to improve these devices for use in cross-point arrays (paper I) and the origin of the switch effect (paper III). Paper II investigates how the work function of a conducting polymer can be modified to allow for better electron injection into an organic light emitting diode.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet , 2006. , 70 p.
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1280
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-38769Local ID: 45552ISBN: 91-85643-56-4OAI: diva2:259618
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2013-12-03
List of papers
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2. Towards all-plastic flexible light emitting diodes
Open this publication in new window or tab >>Towards all-plastic flexible light emitting diodes
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2006 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 433, no 1-3, 110-114 p.Article in journal (Refereed) Published
Abstract [en]

All-plastic light emitting diodes require the design and fabrication of low work function plastic electrodes. Here, we show that the work function of poly(3,4-ethylenedioxythiophene)-polystyrenesulfonic acid (PEDOT-PSS) can be decreased from 4.8 eV to 3.9 eV by surface reaction with the strong electron-donor tetrakis(dimethylamino)ethylene (TDAE). The surface modification was characterized by photoelectron spectroscopy and optical spectroscopy. The low work function plastic electrode was used in a first prototype for all-plastic light emitting diodes.

National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:liu:diva-14831 (URN)10.1016/j.cplett.2006.11.007 (DOI)
Available from: 2008-11-12 Created: 2008-09-25 Last updated: 2015-05-06
3. Filamentary switching of Rose Bengal devices
Open this publication in new window or tab >>Filamentary switching of Rose Bengal devices
(English)Manuscript (preprint) (Other academic)
Abstract [en]

Switch devices with a structure of metal / orgamc layer / metal were fabricated, with the organic layer being Rose Bengal sodium salt, Rose Bengal bis(tricthylammonium) salt, Rose Bengal lactone and Fluorescein. All devices showed reversible switch behavior, ruling out electro reduction or conformational switching. Furthermore, only devices with ITO as substrate and Al or Ag as top electrode showed reversible switch behavior. Electrical characterization of the ITO substrate indicated that the switching is due to the reversible formation of conducting filaments, initiated from the ITO.

National Category
Engineering and Technology
urn:nbn:se:liu:diva-102204 (URN)
Available from: 2013-12-03 Created: 2013-12-03 Last updated: 2015-05-06

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