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Ultra-low voltage air-stable polyelectrolyte gated n-type organic thin film 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.ORCID iD: 0000-0002-0302-226X
Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-4791-4785
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0001-8845-6296
2011 (English)In: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 99, no 6, 063305- p.Article in journal (Refereed) Published
Abstract [en]

Complementary circuits, processing digital signals, are a cornerstone of modern electronics. Such circuits require both p-and n-type transistors. Polyelectrolytes are used as gate insulators in organic thin film transistors (OTFTs) to establish an electric double layer capacitor upon gate bias that allows low operational voltages (andlt;1 V). However, stable and low-voltage operating n-channel organic transistors have proven difficult to construct. Here, we report ultra-low voltage n-channel organic polymer-based transistors that are stable in ambient atmosphere. Our n-type OTFTs exhibit on/off ratios around 10(3) for an applied drain potential as low as 0.1 V. Since small ions are known to promote electrochemical reactions within the semiconductors channel bulk and typically slow down the transistor, we use a solid polycationic gate insulator that suppresses penetration of anions into the n-channel semiconductor. As a result, our n-channel OTFTs switch on in under 5 ms and off in less than 1 ms.

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2011. Vol. 99, no 6, 063305- p.
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-70331DOI: 10.1063/1.3626587ISI: 000293857700076OAI: diva2:438346
|Swedish Government||Swedish Foundation for Strategic Research (OPEN)||Knut and Alice Wallenberg Foundation||Onnesjo Foundation||Available from: 2011-09-02 Created: 2011-09-02 Last updated: 2015-10-16
In thesis
1. Upscaling Organic Electronic Devices
Open this publication in new window or tab >>Upscaling Organic Electronic Devices
2015 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Conventional electronics based on silicon, germanium, or compounds of gallium require prohibitively expensive investments. A state-of-the-art microprocessor fabrication facility can cost up to $15 billion while using environmentally hazardous processes. In that context, the discovery of solution-processable conducting (and semiconducting) polymers stirred up expectations of ubiquitous electronics because it enables the mass-production of devices using well established high-volume printing techniques.

In essence, this thesis attempts to study the characteristics and applications of thin conducting polymer films (<200 nm), and scale them up to thick-films (>100 μm). First, thin-films of organic materials were combined with an electric double layer capacitor to decrease the operating voltage of organic field effect transistors. In addition, ionic current-rectifying diodes membranes were integrated inside electrochromic displays to increase the device’s bistability and obviate the need for an expensive addressing backplane.

This work also shows that it is possible to forgo the substrate and produce a self-standing electrochromic device by compositing the same water-processable material with nanofibrillated cellulose (plus a whitening pigment and high-boiling point solvents). In addition, we investigated the viability of these (semi)conducting polymer nanopaper composites in a variety of applications. This material exhibited an excellent combined electronic-ionic conductivity. Moreover, the conductivities in this easy-to-process composite remained constant within a wide range of thicknesses. Initially, this (semi)conducting nanopaper composite was used to produce electrochemical transistors with a giant transconductance (>1 S). Subsequently, it was used as electrodes to construct a supercapacitorwhose capacitance exceeds 1 F.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2015. 62 p.
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1711
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:liu:diva-122022 (URN)10.3384/diss.diva-122022 (DOI)978-91-7685-929-2 (print) (ISBN)
Public defence
2015-11-13, Resursen, Pronova, Norrköping Konferens, St Persgatan 19, Norrköping, 10:15 (English)
Available from: 2015-10-16 Created: 2015-10-16 Last updated: 2015-10-20Bibliographically approved

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Malti, AbdellahGabrielsson, ErikBerggren, MagnusCrispin, Xavier
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