Concentration effects on intrachain polaron recombination in conjugated polymers
2015 (English)In: Physical Chemistry, Chemical Physics - PCCP, ISSN 1463-9076, E-ISSN 1463-9084, Vol. 17, no 2, 1299-1308 p.Article in journal (Refereed) Published
The influence of different charge carrier concentrations on the recombination dynamics between oppositely charged polarons is numerically investigated using a modified version of the Su-Schrieffer-Heeger (SSH) model that includes an external electric field and electron-electron interactions. Our findings show that the external electric field can play the role of avoiding the formation of excited states (polaron-exciton and neutral excitation) leading the system to a dimerized lattice. Interestingly, depending on a suitable balance between the polaron concentration and the electric field strength, the recombination mechanism can form stable polaron-excitons or neutral excitations. These results may provide guidance to improve the electroluminescence efficiency in Polymer Light Emitting Diodes.
Place, publisher, year, edition, pages
Royal Society of Chemistry , 2015. Vol. 17, no 2, 1299-1308 p.
IdentifiersURN: urn:nbn:se:liu:diva-113492DOI: 10.1039/c4cp04514aISI: 000346236000067PubMedID: 25423278OAI: oai:DiVA.org:liu-113492DiVA: diva2:781957
Funding Agencies|Swedish Research Council (VR); Swedish National Infrastructure for Computing (SNIC); Brazilian Research Council CNPq; Brazilian Research Council CAPES; Brazilian Research Council FINATEC2015-01-192015-01-192015-01-19