The thermoelectric effect in several cationichyphen;dye photoconductors has been investigated. For all, there was an inverse relationship between illuminance and thermoelectric power. In the case of rhodaminehyphen;B, the magnitude of the effect could be calculated from published kinetic and ESR data for this substance, using a localizedhyphen;process model. The effect of varying illuminance was ascribed to a logarithmic distribution of the characteristic trapping levels over a range of 0.12 eV. For crystal violet, the thermoelectric power calculated from a similar model is about 50 higher than that observed, for reasons unknown. Attempts to interpret the data in terms of a simple band model proved unsatisfactory.
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