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Intrinsic and extrinsic influences on the temperature dependence of mobility in conjugated polymers
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.ORCID iD: 0000-0001-5154-0291
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2008 (English)In: Organic electronics, ISSN 1566-1199, E-ISSN 1878-5530, Vol. 9, no 5, 569-574 p.Article in journal (Refereed) Published
Abstract [en]

The temperature dependence of charge carrier mobility in conjugated polymers and their blends with fullerenes is investigated with different electrical methods, through field effect transistor (FET), space charge limited current (SCLC) and charge extraction (CELIV) measurements. Simple models, such as the Gaussian disorder model (GDM), are shown to accurately predict the temperature behavior, and a good correlation between the different measurement methods is obtained. Inconsistent charge carrier concentrations in the modeling are explained through intrinsic non-equilibrium effects, and are responsible for the limited applicability of existing numerical models. A severe extrinsic influence from water in FETs with a hydrophilic insulator interface is also demonstrated. The presence of water leads to a significant overestimate of the disorder in the materials from measurements close to room temperature and erratic behavior in the 150-350 K range. To circumvent this problem it is shown to be necessary to measure under ultra high vacuum (UHV) conditions. © 2008 Elsevier B.V. All rights reserved.

Place, publisher, year, edition, pages
Elsevier, 2008. Vol. 9, no 5, 569-574 p.
Keyword [en]
Electrical transport, Field effect transistor, Fullerene, Mobility, Polymer, Temperature dependence
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-50043DOI: 10.1016/j.orgel.2008.03.002OAI: oai:DiVA.org:liu-50043DiVA: diva2:270939
Note

The previous status of this article was Manuscript.

Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2017-02-03Bibliographically approved
In thesis
1. Electronic Transport in Polymeric Solar Cells and Transistors
Open this publication in new window or tab >>Electronic Transport in Polymeric Solar Cells and Transistors
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main topic of this dissertation is electronic charge transport in polymeric and molecular organic materials and material blends intended for solar cell applications. Charge transport in polymers is a strange beast and carrier mobility is rarely a well-defined number. Measurements on different sample geometries and under different conditions tend to give different results and when everything is to be related to solar cell performance it is imperative that there is a way to correlate the results from different measurements. Polymer solar cells utilize composite materials for their function. This puts an additional twist on charge transport studies, as there will also be interaction between the different phases to take into account.

Several measurement techniques have been used and their interrelationships as well as information on their relevance for solar cells have been investigated. Field effect transistors (FET) with an organic active layer have proved to be one of the more versatile measurement geometries and are also an interesting topic in itself. FETs are discussed both as a route for material characterization and as components. A main result correlates bias stress in organic field effect transistors with the electronic structure of the material.

Power conversion efficiency in solar cells is discussed with respect to electrical properties. The interaction of different blend materials and the impact of stoichiometry on transport properties in the active layer have been investigated. Results indicate that charge transport properties frequently are a key determining factor for which material combinations and ratios that works best.

Some work on the conductive properties of nano-fibers coated with semiconducting polymers has also been done and is briefly discussed. The conductive properties of nano-fibers have been studied through potential imaging.

Place, publisher, year, edition, pages
Institutionen för fysik, kemi och biologi, 2007. 70 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1142
National Category
Physical Sciences
Identifiers
urn:nbn:se:liu:diva-10380 (URN)978-91-85895-50-2 (ISBN)
Public defence
2007-11-20, Planck, Fysikhuset, Campus Valla, Linköpings Universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2007-12-05 Created: 2007-12-05 Last updated: 2017-01-11Bibliographically approved

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Andersson, MattiasOsikowicz, WojciechBerggren, MagnusInganäs, Olle

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