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Low-Voltage Polymer Field-Effect Transistors Gated via a Proton Conductor
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.ORCID iD: 0000-0001-8845-6296
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2773-5096
Thin Film Electronics AB.
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2007 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 19, no 1, 97-101 p.Article in journal (Refereed) Published
Abstract [en]

Low operating voltages for p-channel organic field-effect transistors (OFETs) can be achieved by using an electrolyte as the gate insulator. However, mobile anions in the electrolyte can lead to undesired electrochemistry in the channel. In order to avoid this, a polyanionic electrolyte is used as the gate insulator. The resulting OFET has operating voltages of less than 1 V (see figure) and shows fast switching (less than 0.3 ms) in ambient atmosphere.

Place, publisher, year, edition, pages
Wiley Online , 2007. Vol. 19, no 1, 97-101 p.
Keyword [en]
Field-effect transistors, polymer ¿ Photolithography ¿ Polyelectrolytes ¿ Polymers
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-37442DOI: 10.1002/adma.200600871Local ID: 35829OAI: diva2:258291
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-05-06Bibliographically approved
In thesis
1. Electrolyte-Gated Organic Thin-Film Transistors
Open this publication in new window or tab >>Electrolyte-Gated Organic Thin-Film Transistors
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

There has been a remarkable progress in the development of organic electronic materials since the discovery of conducting polymers more than three decades ago. Many of these materials can be processed from solution, in the form as inks. This allows for using traditional high-volume printing techniques for manufacturing of organic electronic devices on various flexible surfaces at low cost. Many of the envisioned applications will use printed batteries, organic solar cells or electromagnetic coupling for powering. This requires that the included devices are power efficient and can operate at low voltages.

This thesis is focused on organic thin-film transistors that employ electrolytes as gate insulators. The high capacitance of the electrolyte layers allows the transistors to operate at very low voltages, at only 1 V. Polyanion-gated p-channel transistors and polycation-gated n-channel transistors are demonstrated. The mobile ions in the respective polyelectrolyte are attracted towards the gate electrode during transistor operation, while the polymer ions create a stable interface with the charged semiconductor channel. This suppresses electrochemical doping of the semiconductor bulk, which enables the transistors to fully operate in the field-effect mode. As a result, the transistors display relatively fast switching (≤ 100 µs). Interestingly, the switching speed of the transistors saturates as the channel length is reduced. This deviation from the downscaling rule is explained by that the ionic relaxation in the electrolyte limits the channel formation rather than the electronic transport in the semiconductor. Moreover, both unipolar and complementary integrated circuits based on polyelectrolyte-gated transistors are demonstrated. The complementary circuits operate at supply voltages down to 0.2 V, have a static power consumption of less than 2.5 nW per gate and display signal propagation delays down to 0.26 ms per stage. Hence, polyelectrolyte-gated circuits hold great promise for printed electronics applications driven by low-voltage and low-capacity power sources.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2011. 62 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1389
Organic electronics, Thin-film transistor, Organic semiconductor, Polymer, Electrolyte, Polyelectrolyte
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:liu:diva-69636 (URN)978-91-7393-088-8 (ISBN)
Public defence
2011-08-26, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:15 (English)
Available from: 2011-08-15 Created: 2011-07-08 Last updated: 2015-05-06Bibliographically approved

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