Interchain effects in the ultrafast photophysics of a semiconducting polymer: THz time-domain spectroscopy of thin films and isolated chains in solution

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Interchain effects in the ultrafast photophysics of a semiconducting polymer: THz time-domain spectroscopy of thin films and isolated chains in solution

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dc.contributor.author Hendry, Euan en_GB
dc.contributor.author Koeberg, Mattijs en_GB
dc.contributor.author Schins, Juleon M. en_GB
dc.contributor.author Nienhuys, H. K. en_GB
dc.contributor.author Sundström, V. en_GB
dc.contributor.author Siebbeles, L. D. A. en_GB
dc.contributor.author Bonn, Mischa en_GB
dc.contributor.department University of Exeter (at the time of publication Euan Hendry was affiliated to Leiden University and FOM Institute for Atomic and Molecular Physics); Leiden University; FOM Institute for Atomic and Molecular Physics, Amsterdam; Delft University of Technology; Lund University en_GB
dc.date.accessioned 2008-07-24T14:55:49Z en_GB
dc.date.accessioned 2011-01-25T11:55:08Z en_US
dc.date.accessioned 2013-03-20T13:24:50Z
dc.date.issued 2005 en_GB
dc.description.abstract We compare the generation and decay dynamics of charges and excitons in a model polymer semiconductor (MEH-PPV) in solution and drop-cast thin films, by recording the sub-ps transient complex conductivity using THz time-domain spectroscopy. The results show that the quantum efficiency of charge generation is two orders of magnitude smaller in solution (~10–5) than in the solid film (~10–3). The proximity of neighboring chains in the films apparently facilitates (hot) exciton dissociation, presumably by allowing the electron and hole to separate on different polymer strands. For both samples, photoexcitation leads to the predominant formation of bound charge pairs (excitons) that can be detected through their polarizability. Surprisingly, the polarizability per absorbed photon is a factor of 3 larger in solution than in the film, suggesting that interchain interactions in the film do not result in a substantial delocalization of the exciton wave function. en_GB
dc.identifier.citation 71 (12), article 125201 en_GB
dc.identifier.doi 10.1103/PhysRevB.71.125201 en_GB
dc.identifier.uri http://hdl.handle.net/10036/33055 en_GB
dc.language.iso en en_GB
dc.publisher American Physical Society en_GB
dc.relation.url http://dx.doi.org/10.1103/PhysRevB.71.125201 en_GB
dc.relation.url http://link.aps.org/abstract/PRB/v71/e125201 en_GB
dc.subject high-speed optical techniques en_GB
dc.subject organic semiconductors en_GB
dc.subject polymer films en_GB
dc.subject excitons en_GB
dc.subject conducting polymers en_GB
dc.subject photoexcitation en_GB
dc.subject polarisability en_GB
dc.subject electron-hole recombination en_GB
dc.title Interchain effects in the ultrafast photophysics of a semiconducting polymer: THz time-domain spectroscopy of thin films and isolated chains in solution en_GB
dc.type Article en_GB
dc.date.available 2008-07-24T14:55:49Z en_GB
dc.date.available 2011-01-25T11:55:08Z en_US
dc.date.available 2013-03-20T13:24:50Z
dc.identifier.issn 1098-0121 en_GB
dc.identifier.issn 1550-235X en_GB
dc.description Euan Hendry, Mattijs Koeberg, Juleon M. Schins, H. K. Nienhuys, V. Sundström, L. D. A. Siebbeles, and Mischa Bonn, Physical Review B, Vol. 71, article 125201 (2005). "Copyright © 2005 by the American Physical Society." en_GB
dc.identifier.journal Physical Review B en_GB


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