Random potential relief and extrinsic photoconductivity of compensated germanium

A photoconductivity spectrum normalized to the optical absorption of compen sated germanium is simulated at low temperatures kT much less than W (where W denotes the energy scale of the random potential that stems from impurit y Coulomb interaction). By fitting the simulated spectrum to the experiment al data, the value of W and the occupancy of the shallow-donor impurity ban d are estimated. A weak energy dependence of the mean free path of electron s in the random potential relief is inferred. (C) 2001 MAIK "Nauka/Interper iodica".