[Impurity photoconductivity in copper doped cadmium sulphide]

In a study of the spectral distribution of photoconductivity in CdS:Cu, it was found that information on the behaviour of impurity levels in the forbidden band could be obtained from charge transfer studies. The Cu dopant gives rise to three characteristic levels which, once populated, result in a Gaussian type contribution to the total photoconductivity. There is excellent correlation between the results obtained and luminescence data.