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Diodes Based on Blends of Molecular Switches and Conjugated Polymers
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Surface Physics and Chemistry. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2773-5096
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-4791-4785
2005 (English)In: Synthetic metals, ISSN 0379-6779, ISSN 0379-6779, Vol. 150, no 3, 217-221 p.Article in journal (Refereed) Published
Abstract [en]

Here we report polymer diodes based on a conjugated polymer host and a dispersed molecular switch. In this case, the molecular switch is a photochromic (PC) molecule that can be reversibly switched between low and high energy gap states, triggered by exposure to ultra-violet and visible light, respectively. While dispersed inside the conjugated polymer bulk and switched to its low energy gap state, the PC molecules act as traps for holes. Solid-state blends of this PC material and conjugated polymers have been demonstrated in diodes. The state of the PC molecule controls the current density versus voltage (JV) characteristics of the resulting diode. Both poly(2-methoxy-5(2′-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) and poly(3-hexylthiophene-2,5-diyl) (P3HT) host materials have been studied. The two conjugated polymers resulted in differing JV switching characteristics. A more pronounced JV switch is observed with MEH-PPV than with P3HT. We postulate that the PC material, while switched to its low energy gap state, act as traps in both the conjugated polymers but at different trap depth energies.

Place, publisher, year, edition, pages
2005. Vol. 150, no 3, 217-221 p.
Polymer diodes, Molecular switch, Photochromic molecule, Charge trap depth, JV modulation
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-12768DOI: 10.1016/j.synthmet.2004.06.035OAI: diva2:17012
Available from: 2008-11-12 Created: 2008-11-12 Last updated: 2015-05-06
In thesis
1. Charge Transport Modulation and Optical Absorption Switching in Organic Electronic Devices
Open this publication in new window or tab >>Charge Transport Modulation and Optical Absorption Switching in Organic Electronic Devices
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic electronics has evolved into a well-established research field thanks to major progresses in material sciences during recent decades. More attention was paid to this research field when “the discovery and development of conductive polymers” was awarded the Nobel Prize in Chemistry in 2000. Electronic devices that rely on tailor-made material functionalities, the ability of solution processing and low-cost manufacturing on flexible substrates by traditional printing techniques are among the key features in organic electronics. The common theme while exploring organic electronics, and the focus of this thesis, is that (semi-)conducting polymers serve as active materials to define the principle of operation in devices.

This thesis reviews two kinds of organic electronic devices. The first part describes electrochemical devices based on conducting polymers. Active matrix addressed displays that are printed on flexible substrates have been obtained by arranging electrochemical smart pixels, based on the combination of electrochemical transistors and electrochromic display cells, into cross-point matrices. The resulting polymer-based active-matrix displays are operated at low voltages and the same active material is used in the electrochemical transistors as well as in the electrochromic display cells, simply by employing the opto-electronic properties of the material. In addition to this first part, a switchable optical polarizer based on electrochromism in a stretch-aligned conducting polymer is described. The second part reports switchable charge traps in polymer diodes. Here, a device based on a solid-state blend of a conjugated polymer and a photochromic molecule has been demonstrated. The solid state blend, sandwiched between two electrodes, provide a polymer diode that allows reversible current modulation between two different charge transport mechanisms via externally triggered switching of the charge trap density.

Place, publisher, year, edition, pages
Institutionen för teknik och naturvetenskap, 2007
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1147
electrochromic, photochromic, PEDOT:PSS, active matrix display, switchable charge traps, printed electronics, switchable polarizer
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:liu:diva-10271 (URN)978-91-85895-35-9 (ISBN)
Public defence
2007-12-14, K3, Kåkenhus, LiU Norrköping, Norrköping, 13:00 (English)
Available from: 2007-11-21 Created: 2007-11-21 Last updated: 2015-05-06

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Andersson, PeterRobinson, Nathaniel D.Berggren, Magnus
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