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Downscaling of Organic Field-Effect Transistors with a Polyelectrolyte Gate Insulator
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Cavendish Laboratory University of Cambridge, UK.
Cavendish Laboratory University of Cambridge, UK.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-8845-6296
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2008 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 20, no 24, 4708-4713 p.Article in journal (Refereed) Published
Abstract [en]

A polyelectrolyte is used as gate insulator material in organic field-effect transistors with self-aligned inkjet printed sub–micrometer channels. The small separation of the charges in the electric double layer at the electrolyte-semiconductor interface, which builds up in tens of microseconds, provides a very high transverse electric field in the channel that effectively suppresses short-channel effects at low applied gate voltages.

Place, publisher, year, edition, pages
Wiley Online , 2008. Vol. 20, no 24, 4708-4713 p.
Keyword [en]
Nanotechnology, Organic electronics, Organic field-effect transistors, Polyelectrolytes, Printed electronics
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-43272DOI: 10.1002/adma.200801756Local ID: 73282OAI: diva2:264131
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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Herlogsson, LarsCrispin, XavierBerggren, Magnus
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