ELECTRICAL-PROPERTIES OF LEAD PHTHALOCYANINE FILMS

Current density-voltage characteristics have been obtained from thin f ilms of lead phthalocyanine particles dispersed in a polymer binder wh en sandwiched between ohmic gold and blocking aluminium electrodes. At low voltages, the current in the forward direction shows Schottky dio de behaviour. The diode parameters are evaluated using the model of Ch eung and Cheung. Barrier heights and widths are determined as a functi on of applied voltage. A number of parameters is evaluated on the basi s of the theory of space-charge-limited conduction, and the following values are obtained: p(0) = 8.5 x 10(18) m(-3), concentration of the t raps per unit energy range at the valence band P-0 approximate to 2.5 x 1044 J(-1) m(-3), temperature parameter of trapping distribution T-c approximate to 500 K and total trapping concentration, N-t approximat e to 1.7 x 10(24) m(-3).