Trap-controlled dispersive transport in systems of randomly fluctuating localized states

Abstract

Trap-controlled dispersive carrier transport and recombination are considered in materials with fluctuating localized states. Under these conditions the distribution of effective activation energies (DEAE) can be different from the momentary energy distribution of localized states. The former rather than the latter governs kinetics of all processes which are controlled by trapping and release of charge carriers. It is shown that Deae and the momentary distribution are rather similar for shallow states and can be very different for sufficiently deep traps. As a result, the fluctuations do not affect dispersive transport characteristics at short times but either terminate the dispersive transport or make its characterisrics temperature independent at longer times.