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An Organic Electrochemical Transistor for Printed Sensors and Logic
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Conducting polymers entered the research field in late 70´s and efforts aimed at achieving printed electronics started a decade later. This thesis treats printable organic electrochemical transistors (OECT). Some conjugated polymers can be switched between a high conducting and a low conducting state in an electrochemical cell. In this thesis, the work carried out using poly(3,4-ethylenedioxythiophene) (PEDOT) as the active material in an electrochemical transistor is reported. The electrochemical transistors, presented, can be designed into a bi-stable and dynamic mode of operation. These transistors operates at voltages below 2V and current on/off ratios are typically 5000, but 105 have been reached. The transistor device can be built up from all-organic materials using common printing techniques such as with screen-printing. The bi-stable transistor can be combined with an electrochromic (EC) display cell to form a smart pixel circuit. Combining several of these smart pixels yield an actively addressed cross-point matrix display. From this an all-organic active matrix display printable on paper has been achieved. The OECT, combined with a resistor network was successfully used in inverter and logic circuits.

One important feature of these organic electrochemical devices is that both ions and electrons are used as the charge (signal) carriers. This is of particular interest and importance for chemical sensors. By combining a proton-conducting electrolyte (Nafion®) that changes its conductivity upon exposure to humidity, a simple OECT humidity sensor was achieved. This proves the use of this OECT as the ion-to-electron transducer.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap , 2005.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 921
Keyword [en]
printable organic electrochemical transistors (OECT), polymers, charge (signal) carriers, proton-conducting electrolyte (Nafion)
National Category
Organic Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-5024ISBN: 91-85297-26-7 (print)OAI: oai:DiVA.org:liu-5024DiVA: diva2:20961
Public defence
2005-02-17, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Linköping, 10:00 (English)
Opponent
Supervisors
Available from: 2005-03-10 Created: 2005-03-10 Last updated: 2017-02-03
List of papers
1. Bi-stable and dynamic current modulation in electrochemical organic transistors
Open this publication in new window or tab >>Bi-stable and dynamic current modulation in electrochemical organic transistors
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2002 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 14, no 1, 51-54 p.Article in journal (Refereed) Published
Abstract [en]

Novel electrochemical transistors, based on the conductive polymer PEDOT, operating at driving voltages of only a few volts in bulk material, and with little demand on substrate planarity, are described by the authors. The underlying polymer ion pair PEDOT:PSS is conductive in both oxidized and reduced state. Two transistor architectures, a bi-stable and a dynamic transistor (the first electrochemical specimen of its kind) with an on/off ratio of 105 and 200 Hz modulation speed, were realized.

Keyword
Conductivity, Polymer films, Transistors
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13560 (URN)10.1002/1521-4095(20020104)14:1<51::AID-ADMA51>3.0.CO;2-# (DOI)
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03
2. An all-organic sensor-transistor based on a novel electrochemical transducer concept printed electrochemical sensors on paper
Open this publication in new window or tab >>An all-organic sensor-transistor based on a novel electrochemical transducer concept printed electrochemical sensors on paper
2002 (English)In: Sensors and Actuators B: Chemical, ISSN 0925-4005, Vol. 86, no 2-3, 193-197 p.Article in journal (Refereed) Published
Abstract [en]

A novel transducer concept based on an organic electrochemical transistor is described. Its function as an integral part of an air humidity sensor, in which the proton conductor Nafion acts as sensitivity layer has been realised. The resulting electrochemical sensor–transistor, based on the conducting polymer PEDOT:PSS, operates at low voltages, on the order of 1 V. The sensor response, measured as the drain–source current of the electrochemical transistor, versus air humidity, has a close to exponential behaviour. The sensor can be realised using exclusively printing and coating fabrication techniques. Here, we demonstrate devices realised on plastic foils and on ordinary coated fine paper substrates. This organic electrochemical transducer promise future applications such as all-integrated low-cost sensor tags for single-use chemical sensors.

Keyword
Organic transistors, Electrochemistry, Nafion, Proton conductors, Printing
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13561 (URN)10.1016/S0925-4005(02)00170-3 (DOI)
Available from: 2005-03-10 Created: 2005-03-10 Last updated: 2017-02-03
3. Active Matrix Displays Based on All-Organic Electrochemical Smart Pixels Printed on Paper
Open this publication in new window or tab >>Active Matrix Displays Based on All-Organic Electrochemical Smart Pixels Printed on Paper
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2002 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, Vol. 14, no 20, 1460-1464 p.Article in journal (Refereed) Published
Abstract [en]

An organic electronic paper display technology (see Figure and also inside front cover) is presented. The electrochromic display cell together with the addressing electrochemical transistor form simple smart pixels that are included in matrix displays, which are achieved on coated cellulose-based paper using printing techniques. The ion-electronic technology presented offers an opportunity to extend existing use of ordinary paper.

 

Place, publisher, year, edition, pages
Weinheim, Germany: Wiley-VCH Verlagsgesellschaft, 2002
Keyword
Displays, active matrix, Electronic paper, Poly(3, 4-ethylenedioxythiophene) (PEDOT), Polystyrene sulfonate (PSS)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-12763 (URN)10.1002/1521-4095(20021016)14:20<1460::AID-ADMA1460>3.0.CO;2-S (DOI)000179034200004 ()
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03Bibliographically approved
4. Electrochemical Logic Circuits
Open this publication in new window or tab >>Electrochemical Logic Circuits
2005 (English)In: Advanced Materials, ISSN 0935-9648, Vol. 17, no 3, 353-358 p.Article in journal (Refereed) Published
Keyword
Logic gates, organic, Transistors, electrochemical
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-13563 (URN)10.1002/adma.200401273 (DOI)
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-02-03

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