Critical temperature and products of intrachain polaron recombination in conjugated polymers
2014 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 16, no 32, 17072-17080 p.Article in journal (Refereed) Published
The intrachain recombination dynamics between oppositely charged polarons is theoretically investigated through the use of a version of the Su-Schrieffer-Heeger (SSH) model modified to include an external electric field, an extended Hubbard model, Coulomb interactions, and temperature effects in the framework of a nonadiabatic evolution method. Our results indicate notable characteristics concerning the polaron recombination: (1) it is found that there exists a critical temperature regime, below which an exciton is formed directly and (2) a pristine lattice is the resulting product of the recombination process, if the temperature is higher than the critical value. Additionally, it is found that the critical electric field regime plays the role of drastically modifying the system dynamics. These facts suggest that thermal effects in the intrachain recombination of polarons are crucial for the understanding of electroluminescence in optoelectronic devices, such as Polymer Light Emitting Diodes.
Place, publisher, year, edition, pages
Royal Society of Chemistry, 2014. Vol. 16, no 32, 17072-17080 p.
Physical Sciences Chemical Sciences
IdentifiersURN: urn:nbn:se:liu:diva-110271DOI: 10.1039/c4cp02184cISI: 000340353000022PubMedID: 25005593OAI: oai:DiVA.org:liu-110271DiVA: diva2:744054
Funding Agencies|Swedish Research Council; Brazilian Research Council CNPq; CAPES; FINATEC2014-09-052014-09-052014-10-07Bibliographically approved