The photoconduction in the solid molecular complexes of pyrene with tetracyanoethylene, bromanil, and 1,3,5hyphen;trinitrobenzene has been observed. In each case, the intrinsic photoconduction arises with photon energy a little higher than the energy gap for the excitation to the conduction state, while its spectral region does not coincide with the chargehyphen;transfer band in the electronic spectrum. It has been suggested that in these ``weak'' chargehyphen;transfer solid complexes, the excited state associated with the chargehyphen;transfer band cannot contribute to conduction, and an energy diagram for the electronic state in these crystals has been proposed.A structurehyphen;sensitive secondary photoconduction has been observed in the spectral region around the threshold of the chargehyphen;transfer band, which is likely due to the interaction between chargehyphen;transfer excitons and imperfections in the crystal.
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