Effects of Concentration and Localization Length on Charge Carrier Mobility in Organic Disordered Semiconductors
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Date
2018-08-04
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Addis Ababa University
Abstract
Using computer simulations, we show that the dependence of the hopping
carrier mobility on the electric field _(F) in a disordered organic semiconducting
polymer of random energy sites described by a Gaussian density of
states is determined by the localization length _ and not by the concentration
of sites N. This result is in drastic contrast to what is usually assumed in
the literature for a theoretical description of experimental data and for device
modeling, where N1=3 is considered as the decisive length scale for _(F). In
the proposed it is assumed that the localized states are randomly distributed
in energy and space coordinates. The expression for hopping conductivity is
obtained for the Gaussian density of states and the analysis of electric field
dependent hopping mobility is shown by the Poole-Frenkel behavior is only
valid in medium electric field.
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Keywords
Effects of Concentration, Localization Length, Charge Carrier Mobility, Organic Disordered Semiconductors