Measurements of the temperature dependence of the ohmic and space-charge limited (SCL) currents flowing in the C* direction of crystals of β-zinc phthalocyanine under vacuum enables the deduction of both, depth and concentration of localized levels in this molecular solid. The bulk current in ZnPc crystals is found to exhibit ohmic behaviour up to fields of 5 × 105 Vm−1 and square-law dependence on voltages beyond this value. A discrete electron level 0.37 eV below the conduction band, with a state density of 3 × 1025 m−3 is observed. The thermal band gap is 1.67 eV.
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Abdel‐Malik et al. (1982) studied this question.
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