All-polymer bistable resistive memory device based on nanoscale phase-separated PCBM-ferroelectric blends
KAUST DepartmentPhysical Sciences and Engineering (PSE) Division
Imaging and Characterization Core Lab
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Materials Science and Engineering Program
Functional Nanomaterials and Devices Research Group
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AbstractAll polymer nonvolatile bistable memory devices are fabricated from blends of ferroelectric poly(vinylidenefluoride-trifluoroethylene (P(VDF-TrFE)) and n-type semiconducting [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). The nanoscale phase separated films consist of PCBM domains that extend from bottom to top electrode, surrounded by a ferroelectric P(VDF-TrFE) matrix. Highly conducting poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) polymer electrodes are used to engineer band offsets at the interfaces. The devices display resistive switching behavior due to modulation of this injection barrier. With careful optimization of the solvent and processing conditions, it is possible to spin cast very smooth blend films (Rrms ≈ 7.94 nm) and with good reproducibility. The devices exhibit high Ion/I off ratios (≈3 × 103), low read voltages (≈5 V), excellent dielectric response at high frequencies (Ïμr ≈ 8.3 at 1 MHz), and excellent retention characteristics up to 10 000 s. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
SponsorsThe authors acknowledge the generous financial support from the KAUST baseline fund and Saudi Basic Industries (SABIC) Grant No. 2000000015. The authors also acknowledge Mrs. Supriya Chewle for her help with artistic rendering of the images.
JournalAdvanced Functional Materials