Abstract
The effects of ambient gas on the electrical conductive properties of gallium phthalocyanine (GaClPc) thin films were investigated. The kinds of ambient gas were humid air (humidity 72%), quasi-dry air, nitrogen and oxygen in 10-5, 10-2, 50, 100 and 760 Torr. From these results, the Id-/Id+ ratio in above 50 Torr showed about 1000 times with remarkable rectification characteristics and there are no non-linear in less than 10-2 Torr.
Humidity is little effective for this conductivity. Since the GaClPc is electron-donortype, the oxygen of the electron-acceptor type iseasily adsorbed by GaClPc. These result indicate that the oxygen varies from physical adsorption into the chemical adsorption. Oxygen adsorption resulted in an appreciable change in the surfacecharge density. Also, the adsorbed oxygen causes the remarkable rectification characteristic by the strong Schottky effect at the interface.
