Addition of an astutely selected third monomer to poly(vinylidene fluoride-trifluoroethylene) (P(VDF-TrFE))-based polymers can significantly improve their electromechanical response. This is demonstrated here for the terpolymer containing 1, 1 -chlorofluoroethylene as the third monomer, which effectively reduces the all-trans conformation in the polymer, and thus enhances the molecular conformational changes that accompany the polarization response under an external electric field.