Intracenter Transition in EL2 Observed in Photocurrent Spectrum

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Abstract
At low temperature (4.2 K) photocurrent spectra of undoped semi-insulating GaAs crystals exhibit an extra band centered at about 1.17 eV and a fine structure between 1.04 and 1.10 eV. These structures are virtually identical to those of the optical absorption spectra recently reported by Kaminska et al., who claimed that they are ascribable to the intracenter transitions in EL2, because the structures are never observed in their photocurrent spectra. We discuss the cause of inconsistency between their result and ours and also some mechanisms in which the intracenter transition in EL2 is observed in the photocurrent spectrum.