The dynamic organic p-n junction
2009 (English)In: Nature Materials, ISSN 1476-1122, E-ISSN 1476-4660, Vol. 8, no 8, 672-676 p.Article in journal (Refereed) Published
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.
IdentifiersURN: urn:nbn:se:liu:diva-19809DOI: 10.1038/nmat2478ISI: 000268288000021ScopusID: 2-s2.0-69249206556OAI: oai:DiVA.org:liu-19809DiVA: 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. http://dx.doi.org/10.1038/NMAT2478 Copyright: Nature Publishing Group http://npg.nature.com/2009-08-282009-08-102015-05-22Bibliographically approved