Buffer electrode layers tuned electrical properties, fatigue behavior and phase transition of KNN-based lead-free ferroelectric films
JOURNAL OF MATERIALS CHEMISTRY C(2023)
摘要
This study investigates the impact of different conductive buffer electrode layers on the electrical properties, fatigue behavior and phase transition of epitaxial KNN-based ferroelectric films. Two types of buffer electrode layers, p-type La0.67Ca0.33MnO3/La0.67Ba0.33MnO3 and n-type LaNiO3/Nb-SrTiO3, are selected for analysis. The results demonstrate that the electrical properties and fatigue behavior of the KNN-based films are significantly influenced by the buffer electrode layers. Specifically, the KNN-based films buffered with p-type electrodes exhibit superior ferroelectric/dielectric properties and fatigue resistance compared to those buffered with n-type electrodes. The ferroelectric hysteresis loops of p-type electrode buffered KNN-based films demonstrate higher saturation, larger twice remnant polarization (2Pr) and higher dielectric constant (& epsilon;) (2Pr = 58.5/46.9 & mu;C cm-2 and & epsilon; = 1290/1003 for La0.67Ca0.33MnO3/La0.67Ba0.33MnO3-buffered KNNLT-M films) compared to the films grown on n-type electrodes (2Pr = 29.5/24.5 & mu;C cm-2 and & epsilon; = 802/668 for LaNiO3/Nb-SrTiO3-buffered KNNLT-M films). Moreover, the KNN-based films grown on p-type buffer electrode layers exhibit high fatigue resistance, maintaining consistent ferroelectric hysteresis loops even after 108 bipolar switching cycles, while those on n-type buffer electrode layers experience dramatic fatigue after only 106 cycles. Temperature-dependent dielectric analysis reveals that all studied KNN-based films exhibit relaxor ferroelectric behavior, with the p-type electrode buffered films exhibiting higher phase transition temperatures than the n-type electrode buffered films. These findings demonstrate that the conductive type of the buffer electrode layer can effectively tune the performance of KNN-based films, indicating the high application potential in lead-free electronic device. Herein, the impact of conductive buffer electrode layers (p- or n-type) on the electrical properties and fatigue behavior of KNN-based ferroelectric films are investigated.
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关键词
buffer electrode layers,electrical properties,knn-based,lead-free
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