Abstract
The photoconductive spectral response of amorphous Sb 1− x Se x films as a function of composition shows that an excess of Sb or Se causes a shift toward smaller or larger activation energies, respectively, when compared with stoichiometric Sb 2Se 3 films ( x=0.60). This shift agrees with the shift of the optical absorption edge. An estimate of the density of states at the quasi-Fermi level for amorphous Sb 2Se 3 gives values of at least 10 4 greater than the single crystal material.
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