Phonon-driven ultrafast exciton dissociation at donor-acceptor polymer heterojunctions

Details Phonon-driven ultrafast exciton dissociation at donor-acceptor polymer heterojunctions Phonon-driven ultrafast exciton dissociation at donor-acceptor polymer heterojunctions

2007-07-14

arxiv.org/abs/0707.2163v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.100.107402

A quantum-dynamical analysis of phonon-driven exciton dissociation at polymer heterojunctions is presented, using a hierarchical electron-phonon model parameterized for three electronic states and 24 vibrational modes. Two interfering decay pathways are identified: a direct charge separation, and an indirect pathway via an intermediate bridge state. Both pathways depend critically on the dynamical interplay of high-frequency C=C stretch modes and low-frequency ring-torsional modes. The ultrafast, highly non-equilibrium dynamics is consistent with time-resolved spectroscopic observations.

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