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 polymerferroelectric-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?C/cm2, coercive field (Ec)=55 MV/m and a peak capacitance density of 45nF/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.
inkjet-printing flexible substrates p(vdf-trfe) pedot:pss ferroelectric capacitors transparent electrodes