High‐Performance Ferroelectric Memory Based on Phase‐Separated Films of Polymer Blends

Abstract

High-performance polymer memory is fabricated using blends of ferroelectric poly(vinylidene-fl uoride-trifl uoroethylene) (P(VDF-TrFE)) and highly insulating poly(p-phenylene oxide) (PPO). The blend fi lms spontaneously phase separate into amorphous PPO nanospheres embedded in a semicrystalline P(VDF-TrFE) matrix. Using low molecular weight PPO with high miscibility in a common solvent, i.e., methyl ethyl ketone, blend fi lms are spin cast with extremely low roughness (R rms ≈ 4.92 nm) and achieve nanoscale phase seperation (PPO domain size < 200 nm). These blend devices display highly improved ferroelectric and dielectric performance with low dielectric losses (<0.2 up to 1 MHz), enhanced thermal stability (up to ≈353 K), excellent fatigue endurance (80% retention after 10 6 cycles at 1 KHz) and high dielectric breakdown fi elds (≈360 MV/m).

Reactions Coupled Self‐ and Co‐Assembly: A Highly Dynamic Process and the Resultant Spatially Inhomogeneous Structure

“…And the spatially inhomogeneous, micro‐phase separated co‐assemblies are very common in life system as part of its complexity, however, they are very difficult to achieve in a one‐step process with monomers as starting materials in artificial systems . Although we can still not demonstrate the functions of such structure in the current system so far, it's true that phase structure is highly important for the performances of high performance polymer and functional polymer …”

“…[51] Although we can still not demonstrate the functions of such structure in the current system so far,i t's true that phases tructure is highly important for the performances of high performance polymer and functional polymer. [52,53] What's more, the highlyd ynamic assembly system can also lead to different final structures by changing the pH values duringt he assembly.W hen the pH values of Au I -3MPA-co-Cys were changed from 4.25 to 6.17 after it had assembled for 1min at pH 5.10, the absorption peak positions of the assemblies change from 386 nm to 368 nm ( Figure S10), indicating the dynamic change of its structures. The above results show that highly dynamic assembly system can also lead to different final structures by changingt he pH values during the assembly.…”

Polarization fatigue of organic ferroelectric capacitors

“…However, the advantage of organic ferroelectric materials is compatibility with low temperature flexible substrates and the possibility for up-scaling by large-area solution processing. The remanent polarization and coercive field of ferroelectric capacitors did not change upon bending with a radius of curvature down to 1 cm, which illustrates that organic ferroelectrics are ideal candidates for flexible electronics or system-in-foil applications67. As an example, high performance non-volatile polymer memories on banknotes have recently been realized8.…”

Hybrid dual gate ferroelectric memory for multilevel information storage

“…There have been various reports on developing low cost flexible all polymer ferroelectric memory with low operating voltages, improved fatigue performance, high mobility and excellent retention properties [4][5][6][7][8][9][10][11][12].…”