Effects Of Concentration And Localization Length On Charge Carrier Mobility In Organic Disordered Semiconductors

Using computer simulations, we show that the dependence of the hoppingrncarrier mobility on the electric field _(F) in a disordered organic semiconductingrnpolymer of random energy sites described by a Gaussian density ofrnstates is determined by the localization length _ and not by the concentrationrnof sites N. This result is in drastic contrast to what is usually assumed inrnthe literature for a theoretical description of experimental data and for devicernmodeling, where NÀ€€1=3 is considered as the decisive length scale for _(F). Inrnthe proposed it is assumed that the localized states are randomly distributedrnin energy and space coordinates. The expression for hopping conductivity isrnobtained for the Gaussian density of states and the analysis of electric fieldrndependent hopping mobility is shown by the Poole-Frenkel behavior is onlyrnvalid in medium electric field.

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