Abstract
The effect of the intrinsic excitation on the photoconductivity spectrum for the GaP:Cu samples is investigated. The specific features emerging as the additional peak at the photon energy ∼1.8 eV are attributed to the effects of redistribution of nonequilibrium charge carriers generated from the first two energy levels of Cu in the surface potential field. The nature of the impurity photoconductivity band peaked at 1.05 eV with the edge at about 0.6 eV is discussed.
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