Premium
Charge carrier mobilities in organic semiconductor crystals based on the spectral overlap
Author(s) -
Stehr Vera,
Fink Reinhold F.,
Deibel Carsten,
Engels Bernd
Publication year - 2016
Publication title -
journal of computational chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.907
H-Index - 188
eISSN - 1096-987X
pISSN - 0192-8651
DOI - 10.1002/jcc.24441
Subject(s) - organic semiconductor , marcus theory , charge (physics) , perylene , chemical physics , acceptor , mobilities , charge carrier , exciton , chemistry , semiconductor , pentacene , computational chemistry , condensed matter physics , materials science , molecular physics , physics , quantum mechanics , molecule , optoelectronics , electrode , organic chemistry , social science , sociology , reaction rate constant , kinetics , thin film transistor
The prediction of substance‐related charge‐transport properties is important for the tayloring of new materials for organic devices, such as organic solar cells. Assuming a hopping process, the Marcus theory is frequently used to model charge transport. Here another approach, which is already widely used for exciton transport, is adapted to charge transport. It is based on the spectral overlap of the vibrational donor and acceptor spectra. As the Marcus theory it is derived from Fermi's Golden rule, however, it contains less approximations, as the molecular vibrations are treated quantum mechanically. In contrast, the Marcus theory reduces all vibrational degrees of freedom to one and treats its influence classically. The approach is tested on different acenes and predicts most of the experimentally available hole mobilities in these materials within a factor of 2. This represents a significant improvement to values obtained from Marcus theory which is qualitatively correct but frequently overestimates the mobilities by factors up to 10. Furthermore, the charge‐transport properties of two derivatives of perylene bisimide are investigated. © 2016 Wiley Periodicals, Inc.