Steady-state photoconductivity in a-Si:H prepared by d.c. magnetron methods

Abstract
The exponent γ in the intensity dependence depends on temperature in the usual Rose model format. However, the characteristic temperature depends not just on the steepness of the tail states but on the positions of the dark and quasi-Fermi levels. Values of γ below 1/2 are then allowed. Many estimates of tail-state densities reported up until now are probably too steep as they have misinterpreted this characteristic temperature.