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Solution processed ZnO nanowires/polyfluorene heterojunctions for large area lightening
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
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2010 (English)In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 490, no 4-6, 200-204 p.Article in journal (Refereed) Published
Abstract [en]

Hybrid inorganic-organic semiconductor heterojunctions are nowadays scrutinized for optoelectronic devices, such as solar cells and light emitting diodes. Here, ZnO nanowires/polyfluorene heterojunctions have been entirely fabricated from solution by wet chemistry and low temperature processes. The transparent plastic electrode PEDOT injects holes in the polyfluorene, while the electrons are injected via the ZnO-Au contact, thus avoiding the use of air sensitive low work function metals. The hybrid inorganic-organic light emitting diode emits almost white light. Because of its solution processability, stable cathode, low cost and low temperature process, the ZnO/polymer heterojunction devices are promising for large area lightening applications.

Place, publisher, year, edition, pages
Elsevier Science B.V., Amsterdam. , 2010. Vol. 490, no 4-6, 200-204 p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-55530DOI: 10.1016/j.cplett.2010.03.050ISI: 000276822100018OAI: diva2:316222
Available from: 2010-04-30 Created: 2010-04-30 Last updated: 2015-05-18Bibliographically approved
In thesis
1. Heterojunctions between zinc oxide nanostructures and organic semiconductor
Open this publication in new window or tab >>Heterojunctions between zinc oxide nanostructures and organic semiconductor
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Lighting is a big business, lighting consumes considerable amount of the electricity. These facts motivate for the search of new illumination technologies that are efficient. Semiconductor light emitting diodes (LEDs) have huge potential to replace the traditional primary incandescent lighting sources. They are two basic types of semiconductor LEDs being explored: inorganic and organic semiconductor light emitting diodes. While electroluminescence from p-n junctions was discovered more than a century ago, it is only from the 1960s that their development has accelerated as indicated by an exponential increase of their efficiency and light output, with a doubling occurring about every 36 months, in a similar way to Moore's law in electronics. These advances are generally attributed to the parallel development of semiconductor technologies, optics and material science. Organic light emitting diodes (OLEDs) have rapidly matured during the last 30 years driven by the possibility to create large area light-emitting diodes and displays. Another driving force to specifically use semiconducting polymers is the possibility to build the OLED on conventional flexible substrates via low-cost manufacturing techniques such as printing techniques, which open the way for large area productions.

This thesis deals with the demonstration and investigation of heterojunction LEDs based on p-organic semiconductor and n-ZnO nanostructures. The ZnOorganic heterojunctions are fabricated using low cost and simple solution process without the need for sophisticated vacuum equipments. Both ZnO-nanostructures and the organic materials were grown on variety of substrates (i.e. silicon, glass and plastic substrates) using low temperature methods. The growth mechanism of the ZnO nanostructures has been systematically investigated with major focus in ZnO nanorods/nanowires. Different organic semiconductor materials and device configurations are explored starting with single polymer emissive layer ending up with separate emissive and blocking layers, or even blends. Interestingly, the photoluminescence and electroluminescence spectra of the hybrid LEDs provided a broad emission band covering entirely the visible spectrum [∼400-∼800nm]. The hybrid light emitting diode has a white emission attributed to ZnO intrinsic defects and impurities in combination with the electroluminescence from the conjugated polymers. The ZnO nanostructures in contact with a high workfunction electrode constitute an air stable electron injecting contact for the organic semiconductor. Hence, we have shown that a white light emission can be achieved in a ZnO-organic hybrid light emitting diode using cheap and low temperature growth techniques for both organic and inorganic materials.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 51 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1405
ZnO nanostructures, Organic semiconductors, LEDs
National Category
Natural Sciences
urn:nbn:se:liu:diva-71843 (URN)978-91-7393-046-8 (ISBN)
Public defence
2011-11-04, TP2, Täppan, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
The series number "1504" is incorrect and is changed in the electronic version to the correct number "1405".Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2013-09-12Bibliographically approved

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Wadeasa, AmalSehati, ParisaNour, OmerFahlman, MatsWillander, MagnusBerggren, MagnusCrispin, Xavier
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