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The dynamic organic p-n junction
Umeå University, Umeå, Sweden.
Eindhoven University of Technology, Eindhoven, The Netherlands.
Eindhoven University of Technology, Eindhoven, The Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2773-5096
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2009 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 8, no 8, 672-676 p.Article in journal (Refereed) Published
Abstract [en]

Static p-n junctions in inorganic semiconductors are exploited in a wide range of todays electronic appliances. Here, we demonstrate the in situ formation of a dynamic p-n junction structure within an organic semiconductor through electrochemistry. Specifically, we use scanning kelvin probe microscopy and optical probing on planar light-emitting electrochemical cells (LECs) with a mixture of a conjugated polymer and an electrolyte connecting two electrodes separated by 120 mu m. We find that a significant portion of the potential drop between the electrodes coincides with the location of a thin and distinct light-emission zone positioned andgt;30 mu m away from the negative electrode. These results are relevant in the context of a long-standing scientific debate, as they prove that electrochemical doping can take place in LECs. Moreover, a study on the doping formation and dissipation kinetics provides interesting detail regarding the electronic structure and stability of the dynamic organic p-n junction, which may be useful in future dynamic p-n junction-based devices.

Place, publisher, year, edition, pages
London, UK: Nature Publishing Group, 2009. Vol. 8, no 8, 672-676 p.
National Category
Physical Chemistry
URN: urn:nbn:se:liu:diva-19809DOI: 10.1038/nmat2478ISI: 000268288000021ScopusID: 2-s2.0-69249206556OAI: diva2:229216

Original Publication: Piotr Matyba, Klara Maturova, Martijn Kemerink, Nathaniel D Robinson and Ludvig Edman, The dynamic organic p-n junction, 2009, NATURE MATERIALS, (8), 8, 672-676. Copyright: Nature Publishing Group

Available from: 2009-08-28 Created: 2009-08-10 Last updated: 2015-05-22Bibliographically approved

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