Thermally Stimulated Currents without Optical Excitation. Application to Copper Phtalocyanine

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Abstract
Thermally stimulated current peaks can occur int he absence of previous optical excitation, if at least one of the electrodes on the sample is non‐ohmic. A variety of cases is considered. Most of these cases enable deep‐lying centres which give only very small current peaks to be studied. Their experimental characteristics are presented. They are particularly useful in the case of organic crystals, where optical filling of traps at low temperatures is inefficient and lengthy. This method, applied to copper phtalocyanine, enables centres lying at depths of 0.41 and 0.65 eV, which can not be observed using optical excitation, to be studied.