α型銅フタロシアニンの電気伝導に与える結晶性の影響

抄録

In order to know the effect of crystallinity on electrical conductivity of α Cu-Phthalocyanine (CuPc), the thin films were formed on the glass substrate cleaned with ethyl alcohol in the ultrasonic washer, by means of the vacuum evaporation method. The crystallinity of the thin film was modified by the variation of the substrate temperature. The substrate temperature was changed over a range from -160 to 40°C by heating it with a electric heater and cooling it with the liquid nitrogen. As a results, α CuPc thin films were obtained in the range of the degree of crystallinity from 15 to 60%. The crystallinity of CuPc decreased with decreasing the substrate temperature. Electrical conduction was measured at room temperature in a vacuum vessel by applying the dc voltage. The electrical resistivity in the parallel direction to the substrate, decreased gradually and that in the vertical direction to the substrate, increased gradually with decreasing the degree of crystallinity. It would be surmised that these results is due to a variation of the mobility of, π-electron as a charge carrier in α CuPc.