Abstract
The dc bulk photoconductivity of “pure” pyrene crystals and pyrene crystals doped with perylene has been investigated in the uv region (230–400 mμ). From a study of the spectral response of the hole and electron photocurrents and the effects of varying crystal temperature, the threshold for intrinsic photoconduction is located at about 4.1 eV (300 mμ). With incident photon energies less than 4.1 eV, the generation of holes and electrons is by an extrinsic, impurity-dependent process, which probably involves migration of monomeric singlet excitons to surface or near-surface impurity sites where ionization occurs.
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