Samples of after illumination at low temperatures possess a higher electrical conductance than the same samples without preillumination. The excess conductance is removed by heating above 100°C. The possibility that this "photomemory" effect is due to electron trapping was investigated by methods analogous to thermally stimulated conductivity. When the preilluminated samples are heated at a constant rate with time, , the plots of excess conductance vs . temperature are characterized by two maxima lying at about 25° and 100°C. Under different heating rates, the temperatures of the maxima, , are shifted according to the function In . The values of obtained are interpreted as indicating traps lying 1.03 and 1.34 eV below the conduction band, with a precision of ±15%.
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Schick et al. (1972) studied this question.