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Faradaic currents and ion transfer numbers in electrochemical atomic switches

电化学原子开关中的法拉第电流和离子转移数

基本信息

批准号：
94881407
负责人：
Professor Dr.-Ing. Rainer Waser
金额：
--
依托单位：
Institut für Werkstoffe der Elektrotechnik 2
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2008
资助国家：
德国
起止时间：
2007-12-31 至 2010-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/94881407?language=en
关键词：
Faradaic currents ion transfer numbers

项目摘要

The operating mechanism of the resistive switches, namely the formation and annihilation of a metal filament, is understood to be based on the oxidation and reduction of metal atoms (ions) in the solid-electrolyte materials. However, a variety of phenomena in the switching operation, such as migration of metal ions in materials, oxidation and reduction processes at interfaces between a solid-electrolyte and a metal electrode, are not yet revealed on the atomistic level. These fundamental understandings are essential for clarifying the ultimate physical limits of down-scaling of actual nanodevices. In addition, the physics of the resistive switches should be established prior to introducing these radically new devices into nowadays semiconductor circuits. Because the operating mechanism is much different from that of semiconductor devices, adequate analytical methods and models for calculations are also required to be newly developed.In the project, ionic transfer and oxidation/reduction of metal ions are studied with respect to materials used as ionic conductors and electrodes, to device structures, to forming and operating conditions, and so on. To reveal the main phenomena in the switching, i.e., diffusion and oxidation/reduction processes, the Faradaic transfer number is measured as a key parameter to understand the whole switching process.

阻性开关的工作机制，即金属丝的形成和湮灭，被理解为基于固体电解质材料中金属原子(离子)的氧化和还原。然而，开关操作中的各种现象，如金属离子在材料中的迁移，固体电解质和金属电极界面上的氧化和还原过程，还没有从原子水平上揭示出来。这些基本的理解对于澄清实际纳米设备按比例缩小的最终物理极限是至关重要的。此外，在将这些全新的器件引入当今的半导体电路之前，应该建立阻性开关的物理基础。由于其工作机理与半导体器件有很大的不同，还需要开发新的分析方法和计算模型。在该项目中，从离子导体和电极材料、器件结构、形成和操作条件等方面研究了金属离子的离子转移和氧化/还原。为了揭示开关过程中的主要现象，即扩散和氧化/还原过程，测量了法拉第转移数作为了解整个开关过程的关键参数。