Abstract
We report on the influence of platinum electrodes on polarization switching in thin (80 nm–100 nm) ferroelectric Langmuir films of poly(vinylidene fluoride—trifluoroethylene) (P(VDF-TrFE)). Capacitors with top platinum electrodes show neither polarization switching nor paraelectric-to-ferroelectric phase transition. “Negative capacitance” phenomenon was observed for the devices. Such a behavior can be explained by hydrogen attack and chemical reactions promoted by platinum. Samples with bottom platinum and top aluminum electrodes have considerably lower coercive voltages and faster polarization switching if the top electrode is deposited after the annealing of the copolymer film. It may be caused by the re-arrangement of film's molecular chains, and the influence of aluminum oxide layer.
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