Fixed Capacitor having Polyimide Thin Film Dielectric Formed by Electrodeposition

Abstract

Polyamic acid thin film was electrodeposited on metal foil using the solution containing triethyl-ammonium salt of polyamic acid dissolved in mixed solvent of DMF and methanol. The polyamic acid thin film was continuously imidized to form polyimide dielectric thin film, on which polypyrrole was polymerized as another electrode. Characteristics of this polyimide thin film as a dielectric is similar to that of polyimide film formed by spin coating technique. Applying this method to etched aluminium foil, small size film capacitor which has large capacitance and excellent characteristics was proposed.