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Issue 11, 2015
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Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control

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Abstract

Poly(3,4-ethylenedioxythiophene)-poly(styrenesulphonate) (PEDOT:PSS) is the most used organic hole injecting or hole transporting material. The hole carrying matrix PEDOT is highly doped by the acidic dopant PSS. When coated onto a substrate, PEDOT:PSS makes a highly uniform conductive layer and a thin (<5 nm) overlayer of PSS covers the air interface. Semiconducting polymer layers for organic photovoltaics or light emitting diodes are coated on top. In this article, we demonstrate that the PSS layer will mix with almost all conjugated polymers upon thermal annealing. Depending on the Fermi energy of the polymer an electrochemical reaction can take place, p-type doping the polymer at the interface between the PEDOT:PSS and the semiconducting polymer. We use chemical and spectroscopic analysis to characterize the polymer/PSS interlayer. We show that the stable and insoluble interlayer has a great effect on the charge injection and extraction from the interface. Finally we demonstrate and electronically model organic photovoltaic devices that are fabricated using these mixed interlayers.

Graphical abstract: Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control

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Supplementary files

Article information


Submitted
07 Oct 2014
Accepted
22 Dec 2014
First published
20 Jan 2015

J. Mater. Chem. C, 2015,3, 2664-2676
Article type
Paper
Author version available

Mixed interlayers at the interface between PEDOT:PSS and conjugated polymers provide charge transport control

A. J. Moulé, M. Jung, C. W. Rochester, W. Tress, D. LaGrange, I. E. Jacobs, J. Li, S. A. Mauger, M. D. Rail, O. Lin, D. J. Bilsky, Y. Qi, P. Stroeve, L. A. Berben and M. Riede, J. Mater. Chem. C, 2015, 3, 2664
DOI: 10.1039/C4TC02251C

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