This research has been made possible by a fellowship of the Royal Dutch Academy of Arts and Sciences. We thank Dr. F. Louwet and Dr. L. Groenendaal from Agfa-Gevaert N. V. for providing the Orgacon PEDOT:PSS material. We thank the council for Chemical Sciences of the Netherlands Organization for Scientific Research (CW-NWO) and the Eindhoven University of Technology for financial support through the PIONIER program.
Thermally Induced Transient Absorption of Light by Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonic acid) (PEDOT:PSS) Films: A Way to Probe Charge-Carrier Thermalization Processes†
Article first published online: 7 OCT 2003
Copyright © 2003 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Advanced Functional Materials
Volume 13, Issue 10, pages 805–810, October, 2003
How to Cite
Meskers, S.C.J., van Duren, J.K.J. and Janssen, R.A.J. (2003), Thermally Induced Transient Absorption of Light by Poly(3,4-ethylenedioxythiophene):Poly(styrene sulfonic acid) (PEDOT:PSS) Films: A Way to Probe Charge-Carrier Thermalization Processes. Adv. Funct. Mater., 13: 805–810. doi: 10.1002/adfm.200304398
- Issue published online: 7 OCT 2003
- Article first published online: 7 OCT 2003
- Manuscript Accepted: 5 JUN 2003
- Manuscript Received: 23 APR 2003
- Conducting polymers;
- Photoinduced absorption;
- Poly(3,4-ethylenedioxythiophene) (PEDOT)
Infrared-induced transient absorptions in the millisecond and sub-picosecond time domains have been used to study the dynamics of charge carriers of a conducting polymer, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) (PEDOT:PSS). On the millisecond timescale, the transient absorption is ascribed to a thermal effect induced by absorbed infrared light. The decay of the transient absorption is limited by the transport of heat from the polymer film to the substrate and corresponds to the decay kinetics of infrared-induced changes in the resistivity of the material. Near 1.5 eV, the infrared-induced absorption can be modeled in terms of an interband transition. The assignment of the optical transients in terms of carrier heating opens the possibility to study charge carrier thermalization processes using short laser pulses. Pump-probe spectroscopy on a sub-picosecond timescale shows that the initial thermalization of the excited charge carriers occurs with a time constant of less than 500 fs, i.e., faster than for noble metals.