AI 中文总结
本研究通过模拟框架揭示Cu嵌入SiO_x忆阻器件中界面型和细丝型开关多样性的微观机制，准确重现七种实验I-V响应。
AI 中文摘要
具有亚化学计量SiO$_x$和饼状Cu纳米颗粒（Cu-PCs）的阻变开关器件表现出不同的宏观电流-电压特性，可分为电容型或渐变型（界面型开关）和突变型或电阻型（细丝型开关），这促使我们分析这种多样性背后的微观过程。提出器件的缺陷景观主要由两种带电缺陷类型塑造：可移动的氧空位和不可移动的Cu相关缺陷，它们的分布共同控制界面和体传输。采用有效的一维云格（cloud-in-a-cell）模拟框架，通过纳入这些机制背后的主要耦合离子和电子过程，重现界面型和细丝型开关的唯象图像。该模型包括氧空位漂移-扩散、金属/氧化物界面的肖特基限制注入，以及通过Poole-Frenkel导电的体陷阱辅助传输，顶部界面附近的Cu-PCs被有效处理。基于模拟的参数研究改变电压应力、扫描速率和氧化物厚度，以考察这些因素如何重新平衡电压分配和时空电场分布，从而改变空位重新分布以及界面和体限制导电的相对贡献。使用由先前器件级研究启发的代表性物理参数集，模拟准确重现了七种不同实验观察到的开关响应的特征$I$-$V$曲线。总体而言，这些发现有助于在单一自洽建模框架内将微观缺陷景观和传输过程与实验测量的宏观响应联系起来。
英文摘要
Resistive switching devices with sub-stoichiometric SiO$_x$ and pancake-like Cu nanoparticles (Cu-PCs) exhibit distinct macroscopic current-voltage characteristics classified as capacitive or gradual (interface-type switching) and abrupt or resistive (filamentary-type switching), motivating an analysis of the microscopic processes underlying this diversity. It is proposed that the device defect landscape is largely shaped by two charged defect types, mobile oxygen vacancies and immobile Cu-related defects, whose distributions jointly govern interfacial and bulk transport. An effective one-dimensional cloud-in-a-cell simulation framework is employed to reproduce the phenomenological picture of both interface-type and filamentary-type switching by incorporating the dominant coupled ionic and electronic processes underlying these mechanisms. The model includes oxygen-vacancy drift-diffusion, Schottky-limited injection at the metal/oxide interfaces, and bulk trap-assisted transport via Poole-Frenkel conduction, with Cu-PCs near the top interface treated effectively. A simulation-based parametric study varying voltage stress, sweep rate, and oxide thickness is used to examine how these factors rebalance voltage partitioning and the spatiotemporal electric field distribution, thereby altering vacancy redistribution and the relative contributions of interface- and bulk-limited conduction. Using representative, physically motivated parameter sets informed by prior device-level studies, the simulations accurately reproduce the characteristic $I$-$V$ signatures of seven different experimentally observed switching responses. Overall, the findings help to link microscopic defect landscapes and transport processes to experimentally measured macroscopic responses within a single, self-consistent modeling framework.
Comments20 pages, 10 figures, Supplementary Information included at the end of the same PDF
