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

Hiroyuki Tamura, John G. S. Ramon, Eric R. Bittner, Irene Burghardt
2008 Physical Review Letters  
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
more » ... , highly non-equilibrium dynamics is consistent with time-resolved spectroscopic observations.
doi:10.1103/physrevlett.100.107402 pmid:18352229 fatcat:hpkmm7e2qrdxfpw7u7ixgftciy