Organic ferroelectric memory devices with inkjet-printed polymer electrodes on flexible substrates

Drop-on-demand piezoelectric inkjet-printing technique has been used to fabricate a functional cross-bar array of all-organic ferroelectric memory devices. The polymer–ferroelectric-polymer device consists of a ferroelectric copolymer P(VDF-TrFE) film sandwiched between inkjet-patterned, continuous, orthogonal lines of PEDOT:PSS polymer as the bottom and top electrodes. These devices exhibit well-saturated hysteresis curves with a maximum remnant polarization (Pr) = 6.7 μC/cm2, coercive field (Ec) = 55 MV/m and a peak capacitance density of 45 nF/cm2. Our polarization fatigue measurements show that these devices retain ∼100% and 45% of their initial Pr values after 103 and 105 stress cycles, respectively. The overall performance and polarization retention characteristics of these ferroelectric capacitors with inkjet-printed polymer electrodes are comparable to metal and spin-cast polymer electrodes suggesting their potential use in large-area flexible electronics.

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► Demonstrated a fully-functional cross-bar array of organic ferroelectric memory on flexible substrate.
► Inkjet-printed PEDOT:PSS lines as top and bottom electrodes.
► Ferroelectric behavior with a Pr ∼ 6.7 μC/cm2 and Ec ∼ 55 MV/m is comparable to metal or spin-cast polymer electrodes.
► Polarization retention ∼45% after 105 fatigue cycles at 10 Hz.