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Influence of environmental parameters on the electrophotographic characteristics of organic photoconductor thin films

The influence of environmental parameters on the charge acceptance and dark decay rate of organic photoconductor for temperature from -10 degree(s)C to 80 degree(s)C and relative humidity from 25% to 95% has been studied. The decreasing charge acceptance and increasing dark decay rate of the photoconductor are due to the Poole-Frenkel-assisted bulk thermal emission of free holes from shallow and deep emission center with the energies of 0.66 eV and 0.95 eV above the valence band respectively. Above 90% RH, the xerographic characteristic deteriorates due to the decrease in resistivity involving contamination of impurity ions on the photoconductor thin film surface.