The phase shift analysis of modulated photocurrents is used to determine the density of states of sputtered Ge25Se75-xBix films where x = 5,6,7(p-type), 10 and 13 (n-type). The increase of the Bi concentration influences differently the deep states at the valence and the conduction band tails, while E(F) seems to lie in a minimum of the DOS distribution.