Effects of Atmosphere on Voltage Generated in MIM Elements of Polyimide LB Films

Abstract

MIM elements of polyimide LB films were prepared about 7 years ago. In these elements, polyimide LB film of 7 monolayers (nonpolar, about 30A in thickness) are sandwiched by Al and Au evaporated electrodes. Characteristics of generated voltage are as follows;
(1) Generated voltage decreases with the decrease of atmosphere (He, N₂ or air) pressure.
(2) Value of generated voltage is changed by kinds of atmospheres.
(3) Generated veltage is incrased by the circulation of air atmosphere.
According to the above experimental facts, it is considered that decrease of the generated voltage mentioned above is due to not pressure but an interaction between LB films and gas molecules in atmosphere.