Phonon-driven ultrafast exciton dissociation at donor-acceptor polymer heterojunctions
Soft Condensed Matter
2009-11-13 v1
Abstract
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.
Keywords
Cite
@article{arxiv.0707.2163,
title = {Phonon-driven ultrafast exciton dissociation at donor-acceptor polymer heterojunctions},
author = {Hiroyuki Tamura and John G. S. Ramon and Eric R. Bittner and Irene Burghardt},
journal= {arXiv preprint arXiv:0707.2163},
year = {2009}
}