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Influence of side c...
Influence of side chains on electrochromic properties of green donor-acceptor-donor polymers
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- Hellström, Stefan, 1978 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers
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- Cai, Tianqi (author)
- Chalmers tekniska högskola,Chalmers University of Technology,East China University of Science and Technology,Chalmers
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- Inganäs, Olle (author)
- Linköpings universitet,Biomolekylär och Organisk Elektronik,Tekniska högskolan
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- Andersson, Mats, 1966 (author)
- Chalmers tekniska högskola,Chalmers University of Technology,Chalmers
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(creator_code:org_t)
- Elsevier BV, 2011
- 2011
- English.
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In: Electrochimica Acta. - : Elsevier BV. - 0013-4686. ; 56:10, s. 3454-3459
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Abstract
Subject headings
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- Three solution processable cathodically coloring green electrochromic polymers, based on 2,3-diphenyl-5,7-di(thiophen-2-yl)thieno[3,4-b]pyrazine, have been synthesized by oxidative FeCl3 polymerization. The polymers were designed with solubilizing alkyl and oligoethylene oxide side chains to achieve solubility and processability. All three polymers have a small electrochemical bandgap (1.8-1.9 eV) and low oxidation potentials. Spectroelectrochemical studies of polymer films on ITO reveal that the alkyl side chains in head-to-head position on the polymer backbone promote a defined high-energy absorption peak and suppress tailing of charge-carrier absorption into the visible region. Kinetic studies, based on transmission measurements applying a square-wave potential between reduced and oxidized states, show that the polymer with exclusively oligoethylene oxide side chains (P3) had the fastest response times, monitored at the low-energy absorption maxima. The best performing polymer (P1) showed a good optical contrast in the visible region with a Delta T of 26% at 700 nm. An initial test of the electrochemical stability showed that the oligoethylene oxide containing polymers had superior stability over 500 full switches.
Subject headings
- NATURVETENSKAP -- Kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences (hsv//eng)
Keyword
- Spectroelectrochemistry
- processable green
- solar-cells
- Conjugated polymer
- Electrochromism
- FeCl3-polymerization
- polymerization
- oxidized state
- distributions
- design
- maldi-ms
- neutral state
- copolymers
- realization
- MALDI-TOF
- TECHNOLOGY
Publication and Content Type
- art (subject category)
- ref (subject category)
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