Ferroelectric switching measurements in a broad electric field range were conducted for spin-coated ultrathin vinylidene fluoride (VDF)/trifluoroethylene (TrFE) copolymer films deposited with an Au electrode. Application of an extremely high electric field led to saturated polarization reversal without breakdown, and the fastest observed switching time was 25ns with an electric field of 840 MV/m for a 20-nmthick VDF/TrFE copolymer film. It was determined that at thicknesses below 50nm, a marked reduction in Pr from 80 to 40mC/m2 was induced. Reduced thickness also resulted in a low squareness ratio of the hysteresis loop and a marked broadening of derivative switching curves. These are intrinsic thickness effects observed in a VDF/TrFE copolymer film.
ASJC Scopus subject areas
- Physics and Astronomy(all)