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

P.F. Liu (1, 2) , X.J. Meng (1) , J.H. Chu (1) , G. Geneste (2) , B. Dkhil (2)

1 SITP - Shanghai Institute of Technical Physics
2 SPMS - Laboratoire Structures, Propriétés et Modélisation des solides

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. © 2009 American Institute of Physics.

Mots clés: Electric fields; Ferroelectric films; Ferroelectricity; Fluorine compounds; Langmuir Blodgett films; Strain; Temperature; Thin film transistors; External electric field; Ferroelectric polymers; Phenomenological modeling; Poly(vinylidene fluoride-trifluoroethylene); Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)]; Pyroelectric behavior; Pyroelectric coefficients; Pyroelectric response; Dielectric materials

Domaines: Matériaux

P.F. Liu, X.J. Meng, J.H. Chu, G. Geneste, B. Dkhil. Effect of in-plane misfit strains on dielectric and pyroelectric response of poly(vinylidene fluoride-trifluoroethylene) ferroelectric polymer. Journal of Applied Physics, 2009, 105 (11), pp.114105. ⟨10.1063/1.3142262⟩. ⟨hal-02269650⟩