The prime objective of the present paper is to develop polymer electrolyte doped with salt. A solution cast technique was adopted a solid (Poly (methyl methacrylate) (PMMA) as host and salt potassium hydroxide, KOH dopant. Incorporation increases amophosity homogeneity, decreases surface roughness. Moreover, doping (KOH) overall conductivity film. Electrochemical impedance spectroscopy (EIS) re...