Abstract
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 (P-r) = 6.7 mu C/cm(2), coercive field (E-c) = 55 MV/m and a peak capacitance density of 45 nF/cm(2). Our polarization fatigue measurements show that these devices retain similar to 100% and 45% of their initial P-r values after 10(3) and 10(5) 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. (C) 2013 Elsevier B.V. All rights reserved.