Phonon-Driven Ultrafast Exciton Dissociation at Donor-Acceptor Polymer Heterojunctions

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Hiroyuki Tamura,¹ John G. S. Ramon,² Eric R. Bittner,² and Irene Burghardt¹
¹Département de Chimie, Ecole Normale Supérieure, 24 rue Lhomond, F–75231 Paris cedex 05, France
²Department of Chemistry and Texas Center for Superconductivity, University of Houston, Houston, Texas 77204, USA

Received 13 June 2007; published 12 March 2008

Aquantum-dynamical analysis of exciton dissociation at polymer heterojunctions is presented,using a hierarchical electron-phonon model parametrized for three electronic statesand 28 vibrational modes. Two representative interfacial configurations are considered,both of which exhibit an ultrafast exciton decay. The efficiencyof the process depends critically on the presence of intermediatebridge states, and on the dynamical interplay of high- vslow-frequency phonon modes. The ultrafast, highly nonequilibrium dynamics is consistentwith time-resolved spectroscopic observations.

URL:	http://link.aps.org/doi/10.1103/PhysRevLett.100.107402
DOI:	10.1103/PhysRevLett.100.107402
PACS:	78.55.Kz; 63.22.-m; 71.20.Rv; 71.35.-y 78.55.Kz Photoluminescence in solid organic materials 63.22.-m Phonons or vibrational states in low-dimensional structures and nanoscale materials 71.20.Rv Electronic structure of polymers and organic compounds 71.35.-y Excitons and related phenomena YEAR: 2008

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Phys. Rev. Lett. 100, 107402 (2008) [4 pages]

Phonon-Driven Ultrafast Exciton Dissociation at Donor-Acceptor Polymer Heterojunctions

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