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Bipolaron recombination in conjugated polymers
Linköping University, Department of Physics, Chemistry and Biology, Computational Physics . Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Computational Physics . Linköping University, The Institute of Technology.
2011 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 135, no 7, 074902- p.Article in journal (Refereed) Published
Abstract [en]

By using the Su-Schrieffer-Heeger model modified to include electron-electron interactions, the Brazovskii-Kirova symmetry breaking term and an external electric field, we investigate the scattering process between a negative and a positive bipolaron in a system composed of two coupled polymer chains. Our results show that the Coulomb interactions do not favor the bipolaron recombination. In the region of weak Coulomb interactions, the two bipolarons recombine into a localized excited state, while in the region of strong Coulomb interactions they can not recombine. Our calculations show that there are mainly four channels for the bipolaron recombination reaction: (1) forming a biexciton, (2) forming an excited negative polaron and a free hole, (3) forming an excited positive polaron and a free electron, (4) forming an exciton, a free electron, and a free hole. The yields for the four channels are also calculated.]

Place, publisher, year, edition, pages
American Institute of Physics (AIP) , 2011. Vol. 135, no 7, 074902- p.
Keyword [en]
biexcitons, bipolarons, conducting polymers
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-70527DOI: 10.1063/1.3624730ISI: 000294065200038OAI: oai:DiVA.org:liu-70527DiVA: diva2:440068
Note
Funding Agencies|Swedish Research Council||Swedish Energy Agency||Available from: 2011-09-12 Created: 2011-09-12 Last updated: 2017-12-08

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