Fabrication and characterization of all-polymer, transparent ferroelectric capacitors on flexible substrates

All-polymer, transparent ferroelectric devices, based on the functional polymer poly(vinylidene fluoride trifluoroethylene) [P(VDF-TrFE)], have been fabricated on flexible substrates. The performance of the all-polymer devices was studied and compared to devices with metal electrodes. Specifically, poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid) [PEDOT:PSS] and platinum (Pt) electrode effects on the morphology, crystallinity and orientation of P(VDF-TrFE) films were investigated. The devices with PEDOT:PSS electrodes showed similar hysteresis and switching current response compared to Pt electrodes but with tremendously improved fatigue performance. Further, the devices with PEDOT:PSS electrodes showed lower coercive field and better fatigue performance than values reported for other polymer electrodes used with P(VDF-TrFE) on flexible substrates.

Figure optionsDownload as PowerPoint slideHighlights
► All-polymer, flexible and transparent ferroelectric capacitors are demonstrated.
► Improved fatigue performance with polymer electrodes is shown.
► Lower coercive voltage is reported compared to other polymer electrodes.
► Orientation of P(VDF-TrFE) film on metal and polymer electrodes studied using FT-IR.
► Leakage current with polymer electrodes is found to be Schottky controlled.