Charge Transport in Spatially-Disordered Dipolar Media
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 sites are located on the sites 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 inferred from analyses based upon such simulations can depend sensitively on the model of spatial 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.
P. E. Parris, "Charge Transport in Spatially-Disordered Dipolar Media," Proceedings of SPIE - The International Society for Optical Engineering, vol. 3471, pp. 202-210, SPIE--The International Society for Optical Engineering, Jul 1998.
The definitive version is available at http://dx.doi.org/10.1117/12.328161
Xerographic Photoreceptors and Organic Photorefractic Materials IV (1998: Jul. 22-23, San Diego, CA)
Keywords and Phrases
Calculations; Computer simulation; Doping (additives); Monte Carlo methods; Photoconductivity; Polymers; Charge transport; Disorder formalism; Electrostatic potential; Gaussian disorder model; Hopping transport; Molecular transport; Molecularly doped polymers; Site energies; Spatial disorder; Spatial distribution; Charge carriers
International Standard Serial Number (ISSN)
Article - Conference proceedings
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