Abstract
Abstract The spectral responses of the photoconductivity of perylene, pyranthrene, violanthrene, anthanthrone, violanthrone and indanthrazine, as well as the optical absorption spectra of these aromatic solids, have been investigated. Associated with the surface-type cells, when the aromatic films are thin enough, the response curves reproduce the absorption spectra. It has been concluded from this that the photoconductivity is the intrinsic property of the compound and that the lowest excited states are responsible for the electrical conduction. The thresholds for photoconductivity are rather vague. In some cases, however, extra bands are found in the photoconduction spectra outside the main bands. These extra bands locate in the energy regions which correspond to the triplet states of the molecules and are coincident with the thermal energy gaps for the semiconduction.
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