Abstract
High field charge transport in molecularly-doped polymers and amorphous molecular glasses occurs through the hopping motion of photoexcited carriers among localized molecular transport sites characterized by considerable energetic and spatial disorder. A large number of numerical simulations of this process have been performed using models in which transport sties are located on the sties of a regular lattice, with spatial disorder included in a phenomenological fashion. We present calculations that explore drawbacks of this approach, and present arguments to show that the magnitude of the energetic disorder assumed. In particular, we show using a simple model of randomly- placed transport sites with no underlying lattice that such analyses have the potential for attributing to the energetic disorder an artificial dependence on dopant density similar to that reported in the experimental literature.
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