Photoconductivity of macroscopically inhomogeneous amorphous semiconductors: case example for a-Si:H

The behavior of dc and ac photoconductivities observed in a-Si:H in the temperature range 20–300 K, as a case example, is discussed in the context of potential fluctuations. A model is proposed for the non-equilibrium carrier transport in a macroscopic inhomogeneous system and comparison of its results with the experimental data produces physical parameters related with the potential fluctuations.