论文标题
湿度介导的铁电薄膜表面电荷动力学的局部和相关研究
Local and correlated studies of humidity-mediated ferroelectric thin film surface charge dynamics
论文作者
论文摘要
铁电中的电化学现象对于催化和传感应用特别感兴趣，最近的研究突出了铁电化极化，应用的表面电压和整体切换历史的综合作用。在这里，我们介绍了一项系统的开尔文探针显微镜研究研究，该研究对铁电PB中的相对湿度和极化切换历史的影响（Zr $ _ {0.2} $ ti $ _ {0.8} $）O $ _3 $薄膜。我们通过物理约束的无监督的机器学习矩阵分解，字典学习，并揭示了观察到的信号衰减的基础电压介导的物理过程的复杂相互作用，分析了表面电荷与铁电域的相互作用。 Fitzhugh-Nagumo反应扩散模型给出了对观察到的行为的进一步见解，强调了词典学习分析中的横向扩展和电荷钝化过程的贡献者。
Electrochemical phenomena in ferroelectrics are of particular interest for catalysis and sensing applications, with recent studies highlighting the combined role of the ferroelectric polarisation, applied surface voltage and overall switching history. Here, we present a systematic Kelvin probe microscopy study of the effect of relative humidity and polarisation switching history on the surface charge dissipation in ferroelectric Pb(Zr$_{0.2}$Ti$_{0.8}$)O$_3$ thin films. We analyze the interaction of surface charges with ferroelectric domains through the framework of physically constrained unsupervised machine learning matrix factorization, Dictionary Learning, and reveal a complex interplay of voltage-mediated physical processes underlying the observed signal decays. Additional insight into the observed behaviours is given by a Fitzhugh-Nagumo reaction-diffusion model, highlighting the lateral spread and charge passivation process contributors within the Dictionary Learning analysis.
