Charge trapping in a layered organic photoconductor studied by photoacoustic and xerographic discharge measurements

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Abstract
The influence of charge trapping on photocarrier generation in a layered organic photoconductor consisting of a charge generation layer (CGL) and a charge transport layer was studied by means of photoacoustic and xerographic discharge techniques. The photocarrier generation efficiency in the CGL was derived by measuring the decrease in the photoacoustic (PA) signal when an electric field was applied to the sample. Prolonged light exposure under a high applied field increased the photocarrier generation efficiency and the negative xerographic residual potential. After the termination of the applied field, the PA signal reverted to the initial value very slowly. The recovery time of the PA signal after the termination of the applied field agreed well with the decay time of the xerographic residual potential. The increase in the photocarrier generation efficiency and the negative residual potential are due to the trapping of electrons in the CGL.