TRANSPORT-PROPERTIES IN NICKEL PHTHALOCYANINE THIN-FILMS USING GOLD ELECTRODES

Current density-voltage characteristics have been obtained from thin f ilms of nickel phthalocyanine particles dispersed in a polymer binder when sandwiched between ohmic gold contacts. Results showed ohmic cond uction in the lower voltage range and space-charged limited conduction controlled by an exponential distribution of traps above the valence band edge for higher voltage sections. Analyses of the results yielded the following values: hole mobility, mu approximate to 1.0 x 10(-5) m (2) V-1 s(-1); room temperature hole concentration, p(o) approximate t o 1.2 x 10(14) m(-3); concentration of traps per unit energy range at the valence band edge, P-o approximate to 2.2 x 10(44) J(-1) m(-3); te mperature parameter of trapping distribution, T-1 approximate to 820 K ; total trapping concentration, N-t(e) approximate to 1.8 x 10(24) m(- 3).