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Insulator Polarization Mechanisms in Polyelectrolyte-Gated Organic Field-Effect Transistors
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 Science and Technology. Linköping University, The Institute of Technology. null.ORCID iD: 0000-0001-5154-0291
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology. null.ORCID iD: 0000-0001-8845-6296
2009 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 19, no 20, 3334-3341 p.Article in journal (Refereed) Published
Abstract [en]

Electrolyte-gated organic field-effect transistors (OFETs) hold promise for robust printed electronics operating at low voltages. The polarization mechanism of thin solid electrolyte films, the gate insulator in such OFETs, is still unclear and appears to limit the transient current characteristics of the transistors. Here, the polarization response of a thin proton membrane, a poly(styrenesulfonic acid) film, is controlled by varying the relative humidity. The formation of the conducting transistor channel follows the polarization of the polyelectrolyte, such that the drain transient current characteristics versus the time are rationalized by three different polarization mechanisms: the dipolar relaxation at high frequencies, the ionic relaxation (migration) at intermediate frequencies, and the electric double-layer formation at the polyelectrolyte interfaces at low frequencies. The electric double layers of polyelectrolyte capacitors are formed in 1 µs at humid conditions and an effective capacitance per area of 10 µF cm-2 is obtained at 1 MHz, thus suggesting that this class of OFETs might operate at up to 1 MHz at 1 V.

Place, publisher, year, edition, pages
Wiley InterScience , 2009. Vol. 19, no 20, 3334-3341 p.
Keyword [en]
Dielectrics, Ionic conductivity, Organic electronics, Organic field-effect transistors, Polyelectrolytes
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-51545DOI: 10.1002/adfm.200900588OAI: oai:DiVA.org:liu-51545DiVA: diva2:275459
Available from: 2009-11-05 Created: 2009-11-05 Last updated: 2017-02-03Bibliographically approved
In thesis
1. Polarization characteristics in polyelectrolyte thin film capacitors: Targeting field-effect transistors and sensors
Open this publication in new window or tab >>Polarization characteristics in polyelectrolyte thin film capacitors: Targeting field-effect transistors and sensors
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Polymers are very attractive materials that can be tailored for specific needs and functionality. They can for instance be made electrically insulating or (semi)conducting, with specific mechanical properties. Polymers are often processable from a solution, which enables the use of low-cost manufacturing techniques to fabricate polymer devices. Polymer-based electronic and electrochemical devices and sensors have been developed.

This thesis is related to the polarization characteristics in polyelectrolyte thin film capacitor structures. The polarization characteristics have been analyzed at various humidity levels for polyelectrolyte capacitors alone and when incorporated as the gate-insulating material in polyelectrolyte-gated organic field-effect transistors. Both limitations and possibilities of this class of transistors have been identified. Also, a concept for wireless readout of a passively operated humidity sensor circuit is demonstrated. The sensing mechanism of this sensor is related to the polarization in a polyelectrolyte thin film capacitor. This sensor circuit can be manufactured entirely with common printing technologies of today and can be integrated into a low-cost passive sensor label.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2009. 40 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1412
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-51547 (URN)978-91-7393-535-7 (ISBN)
Presentation
2009-10-16, TP2, Täppan, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2009-11-05 Created: 2009-11-05 Last updated: 2017-02-03Bibliographically approved
2. Polyelectrolyte-Based Capacitors and Transistors
Open this publication in new window or tab >>Polyelectrolyte-Based Capacitors and Transistors
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Polymers are very attractive materials that can be tailored for specific needs and functionalities. Based on their chemical structure, they can for instance be made electrically insulating or semiconducting with specific mechanical properties. Polymers are often processable from a solution, which enables the use of conventional low-cost and high-volume manufacturing techniques to print electronic devices onto flexible substrates. A multitude of polymer-based electronic and electrochemical devices and sensors have been developed, of which some already has reached the consumer market.

This thesis focuses on polarization characteristics in polyelectrolyte-based capacitor structures and their role in sensors, transistors and supercapacitors. The fate of the ions in these capacitor structures, within the polyelectrolyte and at the interfaces between the polyelectrolyte and various electronic conductors (a metal, a semiconducting polymer or a network of carbon nanotubes), is of outermost importance for the device function. The humidity-dependent polarization characteristics in a polyelectrolyte capacitor are used as the sensing probe for wireless readout of a passively operated humidity sensor circuit. This sensor circuit can be integrated into a printable low-cost passive sensor label. By varying the humidity level, limitations and possibilities are identified for polyelectrolyte-gated organic field-effect transistors. Further, the effect of the ionic conductivity is investigated for polyelectrolyte-based supercapacitors. Finally, by using an ordinary electrolyte instead of a polyelectrolyte and a high-surface area (supercapacitor) gate electrode, the device mechanisms proposed for electrolyte-gated organic transistors are unified.

Place, publisher, year, edition, pages
Norrköping: Linköping University Electronic Press, 2011. 56 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1370
Keyword
Organic electronics, Polarization, Polyelectrolyte, Transistor, Polymer, Sensor, Capacitor
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-67852 (URN)978-91-7393-160-1 (ISBN)
Public defence
2011-06-13, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Opponent
Supervisors
Available from: 2011-05-02 Created: 2011-04-29 Last updated: 2013-09-12Bibliographically approved

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Larsson, OscarSaid, EliasBerggren, MagnusCrispin, Xavier

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