liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Bi-stable and dynamic current modulation in electrochemical organic 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.
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
ACREO Institute, Norrköping, Sweden.
Show others and affiliations
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.

Place, publisher, year, edition, pages
2002. Vol. 14, no 1, 51-54 p.
Keyword [en]
Conductivity, Polymer films, Transistors
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-13560DOI: 10.1002/1521-4095(20020104)14:1<51::AID-ADMA51>3.0.CO;2-#OAI: oai:DiVA.org:liu-13560DiVA: diva2:20957
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2017-12-13
In thesis
1. An Organic Electrochemical Transistor for Printed Sensors and Logic
Open this publication in new window or tab >>An Organic Electrochemical Transistor for Printed Sensors and Logic
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
printable organic electrochemical transistors (OECT), polymers, charge (signal) carriers, proton-conducting electrolyte (Nafion)
National Category
Organic Chemistry
Identifiers
urn:nbn:se:liu:diva-5024 (URN)91-85297-26-7 (ISBN)
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
2. Electrochemical and electronic devices based on low bandgap polymers
Open this publication in new window or tab >>Electrochemical and electronic devices based on low bandgap polymers
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The research field of the organic electronics includes light emitting diodes (OLEDs), field-effect transistors (OFETs), polymer photovoltaic cells (PVCs), polymer lasers and electrochemical devices. Recently, organic materials are envisaged for spintronics. This dissertation covers a large research scope ranging from electrochemical devices, light emitting diodes, to field-effect transistors, in both processing techniques and device characterizations.

Printed all-organic electrochemical diodes and transistors on flexible plastic or paper substrates have been realized by simple and low-cost method of fabricating. Conducting polymer poly(3,4-ethylenedioxythiophene) poly(styrene sulfonate) (PEDOT:PSS), utilized as active component, is deposited by spin-coating or printing techniques. The devices are directly fabricated from design without the need for masks, patterns or dies. The output characteristics of both half-wave and full-wave rectifier circuits from two-terminal diodes show stable performances at frequencies of 5 Hz. Electrochemical transistors based on both three- and four-terminal configurations have good performances with IONlIoFF current ratios of 103 - 104 at operating voltages below 3 V. The new kind of devices reported are robust and could serve as components in microelectronics, and as redox sensors and detectors since the conductivity of conducting polymers depends on the redox states.

Both LEDs and FETs are realized from a low bandgap donor-acceptor-donor (D-A-D) polymer. The polymer consists of fluorene units and donor-acceptor-donor (D-A-D) units. The D-A-D segment includes two electron-donating thiophene rings combined with a thiadiazolo-quinoxaline unit, which is electron withdrawing to its nature. The resulting polymer is conjugated and has a band gap of 1.27 eV. The corresponding electro- and photoluminescence spectra both peak at approximately 1 Ilm, which is largest emission wavelength ever reported to date. The resulting FETs exhibit typical p-channel functions, and relatively high field-effect mobility of 0.03 cm2y-1s-1, near zero threshold voltage and a current on/off ratio of 5 x104 in ambient atmosphere. The mobility value is highest in low bandgap D-A-D polymers ever reported so far.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2005. 79 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 916
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-38775 (URN)45585 (Local ID)91-85297-09-7 (ISBN)45585 (Archive number)45585 (OAI)
Public defence
2005-05-12, K3, Kåkenhus, Campus Norrköping, Linköpings universitet, Norrköping, 10:00 (English)
Opponent
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2012-12-07Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Authority records BETA

Nilsson, DavidChen, MiaoxiangKugler, ThomasBerggren, Magnus

Search in DiVA

By author/editor
Nilsson, DavidChen, MiaoxiangKugler, ThomasBerggren, Magnus
By organisation
Department of Science and TechnologyThe Institute of Technology
In the same journal
Advanced Materials
Engineering and Technology

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 2606 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf