Abstract
The electrical conductivity of cobalt phthalocyanine thin film sandwich structures using ohmic gold and blocking aluminium electrodes has been measured both after exposure to oxygen for 30 days and after annealing at temperatures up to 423 K. Current density-voltage characteristics under forward bias (gold electrode positive) were found to be due to space-charge-limited conduction controlled by an exponential distribution of traps at lower voltage sections and by a discrete trap level at higher voltage regions. Under reverse bias, the conduction process was interpreted in terms of an electrode-limited to a bulk-limited transition, from Schottky emission to the Poole-Frenkel effect. The effect of annealing resulted in similar behaviour and was found to reduce current density due to oxygen desorption.
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