Diffusion and Drift of Charge Carriers in Molecularly Doped Polymers

The diffusion coefficient $(D)$ and drift mobility (μ) of molecularly doped polymers have been obtained by Monte Carlo parameter fitting of a theoretical equation to time-of-flight transient photocurrent signals. The logarithm of {μ} increased linearly with √E. The negative field dependence of the mobility that has been observed at low electric field appeared to a superimposition of drift and diffusion. An anomalous field-assisted D was observed. The logarithm of D decreased linearly with T^-2.