Structural and ferroelectric properties of P(VDF-TrFE) thin films depending on the annealing temperature

Abstract

Organic P(VDF-TrFE) 70/30 copolymer thin films were prepared on ITO/glass substrates at 110-150 degrees C by spin coating. All the P(VDF-TrFE) thin films exhibited ferroelectric beta-phase crystallinity in X-ray diffraction analysis. The polarization-electric field hysteresis analysis revealed that the P(VDF-TrFE) thin film annealed at 140 degrees C has superior ferroelectric properties with a high remanent polarization of 8.02 mu C/cm(2). From atomic force microscopic characterization, we observed lamellar and needle-like structures in the P(VDF-TrFE) thin film annealed at 140 degrees C. Further, piezoelectric force microscopic measurements confirmed a much higher piezoelectric property of the P(VDF-TrFE) thin film annealed at 140 degrees C than those of the films annealed at other temperatures. (C) 2018 Elsevier B.V. All rights reserved.