Title: Triplet energy transfer in conjugated polymers. II. A polaron theory description addressing the influence of disorder
Authors: Fishchuk, Ivan I ×
Kadashchuk, Andrey
Devi, Lekshmi Sudha
Heremans, Paul
Baessler, Heinz
Koehler, Anna #
Issue Date: Jul-2008
Publisher: Published by the American Physical Society through the American Institute of Physics
Series Title: Physical Review B, Condensed Matter and Materials Physics vol:78 issue:4
Article number: 045211
Abstract: Motivated by experiments monitoring motion of triplet excitations in a conjugated polymer containing Pt-atoms in the main chain (see Paper I), a theoretical formalism for electronic transport has been developed. It considers the interplay between polaronic distortion of the excited chain elements and disorder treated in terms of effective-medium theory. The essential parameters are the electronic coupling J, the polaronic binding energy lambda that determines the activation energy of polaron motion E-a, and the variance sigma of the density of states distribution controlling the incoherent hopping motion. It turns out that for the weak electronic coupling associated with triplet motion (J a few meV), the transfer is nonadiabatic. For a critical ratio of sigma/E-a < 0.3, Marcus-type multiphonon transport prevails above a certain transition temperature. At lower temperatures, transport is disorder controlled consistent with the Miller-Abrahams formalism. Theoretical results are consistent with triplet transport in the Pt-polymer. Implications for charge and triplet motion in random organic semiconductors in general are discussed.
ISSN: 1098-0121
Publication status: published
KU Leuven publication type: IT
Appears in Collections:ESAT - MICAS, Microelectronics and Sensors
× corresponding author
# (joint) last author

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