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Influence of side chains on electrochromic properties of green donor-acceptor-donor polymers

Stefan Hellström (Institutionen för kemi- och bioteknik, Polymerteknologi) ; Tianqi Cai ; O. Inganas ; Mats R. Andersson (Institutionen för kemi- och bioteknik, Polymerteknologi)
Electrochimica Acta (0013-4686). Vol. 56 (2011), 10, p. 3454-3459.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Electrochromism, Conjugated polymer, FeCl3-polymerization, Spectroelectrochemistry, MALDI-TOF, processable green, oxidized state, neutral state, solar-cells, maldi-ms, copolymers, polymerization, distributions, realization, design



Denna post skapades 2011-05-18.
CPL Pubid: 140777

 

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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)

Ämnesområden

Kemi

Chalmers infrastruktur