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

作者：Khan Mohammad A^*; Bhansali Unnat S; Almadhoun Mahmoud N; Odeh Ihab N; Cha Dongkyu; Alshareef Husam N

来源：Advanced Functional Materials, 2014, 24(10): 1372-1381.

DOI：10.1002/adfm.201302056

• polymers
• polymer blends
• memory
• ferroelectrics
• polyphenylene oxides

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 (R-rms approximate to 4.92 nm) and achieve nanoscale phase seperation (PPO domain size %26lt; 200 nm). These blend devices display highly improved ferroelectric and dielectric performance with low dielectric losses (%26lt;0.2 up to 1 MHz), enhanced thermal stability (up to approximate to 353 K), excellent fatigue endurance (80% retention after 10(6) cycles at 1 KHz) and high dielectric breakdown fields (approximate to 360 MV/m).

• 出版日期2014-3