Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2010-05-11
Appl. Phys. Lett. 97, 043305 (2010)
Physics
Condensed Matter
Disordered Systems and Neural Networks
the final version accepted for publication in Appl. Phys. Lett
Scientific paper
We performed direct calculations of carrier hopping rates in strongly disordered conjugated polymers based on the atomic structure of the system, the corresponding electronic states and their coupling to all phonon modes. We found that the dependence of hopping rates on distance and the dependence of the mobility on temperature are significantly different than the ones stemming from the simple Miller-Abrahams model, regardless of the choice of the parameters in the model. A new model that satisfactorily describes the hopping rates in the system and avoids the explicit calculation of electron-phonon coupling constants was then proposed and verified. Our results indicate that, in addition to electronic density of states, the phonon density of states and the spatial overlap of the wavefunctions are the quantities necessary to properly describe carrier hopping in disordered conjugated polymers.
Nenad~Vukmirović
Wang Lin-Wang
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