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Fiber-Embedded Electrolyte-Gated Field-Effect Transistors for e-Textiles
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. 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.ORCID iD: 0000-0001-8845-6296
CIDETEC, Spain.
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2009 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 21, no 5, 573-577 p.Article in journal (Refereed) Published
Abstract [en]

Electrolyte-gate organic field-effect transistors embedded at the junction of textile microfibers are demonstrated. The fiber transistor operates below I V and delivers large current densities. The transience of the organic thin-film transistors current and the impedance spectroscopy measurements reveal that the channel is formed in two steps.

Place, publisher, year, edition, pages
2009. Vol. 21, no 5, 573-577 p.
Keyword [en]
Conducting polymers, electronic textile, fiber transistor, field-effect transistor
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-16982DOI: 10.1002/adma.200802681OAI: oai:DiVA.org:liu-16982DiVA: diva2:200878
Available from: 2009-03-01 Created: 2009-02-27 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Organic electronics on micro and nano fibers: from e-textiles to biomolecular nanoelectronics
Open this publication in new window or tab >>Organic electronics on micro and nano fibers: from e-textiles to biomolecular nanoelectronics
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Research in the field of conjugated polymers (CPs) has led to the emergence of a number of interesting research areas and commercial applications, including solar cells, flexible displays, printed electronics, biosensors, e-textiles and more.

Some of the advantages of organic electronics materials, as compared to their inorganic counterparts, include high elasticity, and mechanical flexibility, which allows for a natural integration of CPs into fabrics, making them ideal for e-texile. In this thesis, a novel approach for creating transistors is presented, through the construction of electrolyte gated transistors, directly embedded on functional textile fibers. Furthermore theoretical and experimental results of the integration of functional woven devices based on these transistors are shown. The realization of woven digital logic and design schemes for devices that can be placed inside living tissue, for applications such as neural communication, are demonstrated.

Reducing feature sizes in organic electronics is necessity just as in conventional microelectronics, where Moore's law has been the most impressive demonstration of this over the past decades. Here the scheme of self-assembly (SA) of biomolecular/CP hybrid nano-structures is used for creating nano electronics. It is demonstrated that proteins in the form of amyloid fibrils can be coated with the highly conducting polythiophene derivative (PEDOT-S) through molecular self-assembly in water, to form conducting nanowire networks and nanodevices at molecular dimensions. In a second SA scheme, large area patterning of connected micro-nano lines and nano transistors from the conducting polymer PEDOT-S is demonstrated through assembly of these from fluids using soft lithography. Thereby the problems of large area nano patterning, and nano registration are solved for organic electronics. The construction of functional nanoscopic materials and components through molecular self-assembly has the potential to deliver totally new concepts, and may eventually allow cheap mass production of complex three dimensional nano electronic materials and devices.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2008. 102 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1224
National Category
Natural Sciences
Identifiers
urn:nbn:se:liu:diva-17661 (URN)978-91-7393-763-4 (ISBN)
Public defence
2008-11-21, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2009-09-21 Created: 2009-04-08 Last updated: 2010-08-30Bibliographically approved
2. 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.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1389
Keyword
Organic electronics, Thin-film transistor, Organic semiconductor, Polymer, Electrolyte, Polyelectrolyte
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
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)
Opponent
Supervisors
Available from: 2011-08-15 Created: 2011-07-08 Last updated: 2017-02-03Bibliographically approved

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Hamedi, MahiarHerlogsson, LarsCrispin, XavierBerggren, MagnusInganäs, Olle

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