Studies of photoinduced charge transfer in conjugated polymer-fullerene composites by light-induced ESR

V. Dyakonov, G. Zoriantis, M. Scharber, C.J. Brabec, R.A.J. Janssen, J.C. Hummelen, N.S. Sariciftci

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademic

Abstract

In this work we present comparative studies of the photoinduced electron transfer (PIT) in a number of conjugated polymer/fullerene composites and in pure components by using light-induced electron spin resonance. PIT from the polymer onto fullerene in the composites results in the appearance of two LESR lines: i) g=2.0025,
g=2.0025,
attributed to the positive polaron on the polymer chain and ii) g=1.9995
g=1.9995
originating from the fullerene anion-radical. These signals have different spin-lattice relaxation times with different temperature dependencies, the low field line possessing the longer relaxation time. The amount of light induced charges is proportional to the square root of the excitation light intensity, which indicates bimolecular recombination of polarons. Both lines have reversible light-induced ESR components and persistent light-induced contribution attributed to trapped polarons.
Original languageEnglish
Title of host publicationElectronic Properties of Novel Materials - Progress in Molecular Nanostructures
EditorsH. Kuzmany, J. Fink, M. Mehring, S. Roth
Place of PublicationWoodbury
PublisherAmerican Institute of Physics
Pages257-260
ISBN (Print)1-56396-808-8
DOIs
Publication statusPublished - 1998

Publication series

NameAIP Conference series
Volume442
ISSN (Print)0094-243X

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    Dyakonov, V., Zoriantis, G., Scharber, M., Brabec, C. J., Janssen, R. A. J., Hummelen, J. C., & Sariciftci, N. S. (1998). Studies of photoinduced charge transfer in conjugated polymer-fullerene composites by light-induced ESR. In H. Kuzmany, J. Fink, M. Mehring, & S. Roth (Eds.), Electronic Properties of Novel Materials - Progress in Molecular Nanostructures (pp. 257-260). (AIP Conference series; Vol. 442). American Institute of Physics. https://doi.org/10.1063/1.56467