Titlebar

Export bibliographic data
Literature by the same author
plus on the publication server
plus at Google Scholar

 

Triplet energy transfer in conjugated polymers. II. A polaron theory description addressing the influence of disorder

Title data

Fishchuk, Ivan I. ; Kadashchuk, Andrey ; Devi, Lekshmi Sudha ; Heremans, Paul ; Bässler, Heinz ; Köhler, Anna:
Triplet energy transfer in conjugated polymers. II. A polaron theory description addressing the influence of disorder.
In: Physical Review B. Vol. 78 (25 July 2008) . - 045211.
ISSN 0163-1829
DOI: https://doi.org/10.1103/PhysRevB.78.045211

Abstract in another language

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 λ that determines the activation energy of polaron motion Ea, and the variance σ 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 σ/Ea<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.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie - Univ.-Prof. Dr. Anna Köhler
Faculties
Faculties > Faculty of Mathematics, Physics und Computer Science
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics
Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Lehrstuhl Experimentalphysik II - Optoelektronik weicher Materie
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 09 Mar 2015 15:37
Last Modified: 09 Mar 2015 15:37
URI: https://eref.uni-bayreuth.de/id/eprint/7927