The mechanism of conductivity enhancement in poly (3,4-ethylenedioxythiophene)-poly(styrenesulfonic) acid using linear-diol additives : its effect on electrochromic performance
Date
2008
Authors
Fabretto, M.V.
Hall, C.J.
Valthlanathan, T.
Innis, P.
Mazurkiewicz, J.
Wallace, G.
Murphy, P.J.
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Thin Solid Films, 2008; 516(21):7828-7835
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Abstract
The conductivity of poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonic) acid (PEDOT-PSS) thin-films was increased by up to 900 times with the addition of linear-diols. Three series of linear-diols were investigated. It is proposed that three mechanisms contribute to improved conductivity; conformational changes in the polymer from coil to expanded, spatial separation of PEDOT-PSS grains and charge screening. The variation in conductivity with temperature indicates that diols affect both intra- and inter-chain charge transports. Electrochromic devices were constructed using standard and enhanced conductivity PEDOT-PSS. Switching times from bleached to darkened states were reduced while darkened to bleached states remained unaltered. Total percent transmission change (%ΔTx) remained constant indicating that enhanced conductivity PEDOT-PSS improves switching but does not lead to additional electrochromic redox sites being accessed. © 2008 Elsevier B.V. All rights reserved.
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