PUB-2014-HPF

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

MA Khan, US Bhansali, MN Almadhoun, IN Odeh, D Cha, H.N. Alshareef, “High‐Performance Ferroelectric Memory Based on Phase‐Separated Films of Polymer Blends”

Advanced Functional Materials

Volume 24Issue 10pages 1372–1381March 12, 2014​, Cover page​

MA Khan, US Bhansali, MN Almadhoun, IN Odeh, D Cha, H.N. Alshareef
polymers; polymer blends; memory; ferroelectrics; polyphenylene oxides
2014
High-performance polymer memory is fabricated using blends of ferroelectric poly(vinylidene-fluoride-trifluoroethylene) (P(VDF-TrFE)) and highly insulating poly(p-phenylene oxide) (PPO). The blend films 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 films are spin cast with extremely low roughness (Rrms ≈ 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 106 cycles at 1 KHz) and high dielectric breakdown fields (≈360 MV/m).