Effect of in-plane misfit strains on dielectric and pyroelectric response of poly(vinylidene fluoride-trifluoroethylene) ferroelectric polymer

Using Landau-Devonshire (LD) phenomenological model, we investigate the dielectric and pyroelectric behaviors of poly(vinylidene fluoride- trifluoroethylene) [P(VDF-TrFE)] ferroelectric Langmuir-Blodgett super thin films. Effects of homogeneous in-plane misfit strains and external electric field on the dielectric properties are combined to be investigated. The theoretical analysis indicates that phase transition temperature can be changed by in-plane misfit strains. Furthermore results show in-plane strains only change the position of peak but value of dielectric constant and pyroelectric coefficient. At one temperature (below phase transition temperature), compressive strain is more beneficial. Consequently the dielectric and pyroelectric responses can be optimized to satisfy various demands by the applied electric fields and tuning in-plane misfit strains.