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ZnO-Polymer hybrid electron only rectifiers
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. null.
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. null.ORCID iD: 0000-0001-5154-0291
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology. null.ORCID iD: 0000-0001-8845-6296
(English)Manuscript (preprint) (Other academic)
Abstract [en]

The combination of organic semiconductors and ZnO nanorods provides new hybrid devices for large area optoelectronics targeting solar energy harvesting and light emission applications. The electronic transport across organic-ZnO heterojunction is not well understood. Here, we investigate systematically the creation of the ZnOpolymer interface and pinpoint potential issues in hybrid devices based on chemically grown ZnO nanorods. For the sake of simplicity, we focus on a ZnO-polymer hybrid device transporting only electrons. The semiconducting polymer used is poly {[N,N0-bis(2-octyldodecyl)-naphthalene-1,4,5,8-bis(dicarboximide)-2,6-diyl]-alt-5,50-(2,20-dithiophene)}. The device shows easy electron injection from Au/ZnO contacts and a good rectification partially governed by the morphology of the heterojunction.

National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:liu:diva-71841ISBN: OAI: oai:DiVA.org:liu-71841DiVA: diva2:454424
Projects
Available from: 2011-11-07 Created: 2011-11-07 Last updated: 2017-02-03Bibliographically 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.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1405
Keyword
ZnO nanostructures, Organic semiconductors, LEDs
National Category
Natural Sciences
Identifiers
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)
Opponent
Supervisors
Note
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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Hansson (f.d. Wadeasa), AmalBerggren, MagnusCrispin, Xavier

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