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The Dember Effect in Particulate ZnO

The Dember effect on electrographic ZnO sheets is characterized by fast motion of electrons in the direction of incident light as long as exposure is to UV. Exposure in the dye-sensitized region leads to much longer signals which are first positive, then negative. Effects of temperature and of the fatigue effects by previous exposures have been studied. The mechanism of the signals from UV exposures can be accounted for readily on the basis of competing processes of trapping by a limited number of centers and of recombination ; that operative on exposure in the dye-sensitized region is much more complicated. It is not sufficient to assume simple electron injection from the dye into the crystal.