Charge carrier drift velocity is typically described in terms of charge carrier mobility μ, which is carrier velocity per unit electric field. In the disorder formalism, mobility is given by:P. M. Borsenberger and D. S. Weiss, "Organic photoreceptors for xerography" (Marcel Dekker: New York, 1998)

where C is a constant, k_{B} is the Boltzmann constant, E is the electric field, T is the temperature, σ is the parameter that characterizes DOS distribution (and diagonal, or energetic, disorder), and Σ is a parameter that characterizes off-diagonal, or positional, disorder.

Use the slider on the right to see how the dynamics of formation of the space-charge field changes with values of μ (charge carrier mobility) from **10 ^{-8} cm^{2}/(Vs)** to