Gate-Controlled Memristive Device for Reliable Resistive Switching
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Solution Overview
Problem
Conventional memristive switching devices rely on unpredictable conductive filament formation, leading to reliability and predictability issues, and often suffer from dielectric breakdown during filament formation.
Innovation Solution
The development of memristive elements with a conductive material layer that reversibly uptakes ionic species, controlled by a gate dielectric layer and gate electrode, allowing for voltage-driven oxygen stoichiometry modulation at the interface to switch between resistive states without forming conductive filaments, thereby enhancing reliability and predictability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conductive filament formation is used to achieve resistive switching, then memory functionality is enabled, but reliability and predictability are reduced due to unpredictable filament formation and potential damage
Solution Approach 1:
The patent extracts the problematic conductive filament formation process from the memristor structure and replaces it with a gate-controlled ionic species modulation mechanism. The gate electrode and gate dielectric layer are introduced to control ionic species distribution in the conductive material layer without requiring unpredictable filament formation, thereby improving reliability while eliminating the complexity of filament dynamics.
Solution Approach 2:
The gate dielectric layer acts as an intermediary between the gate electrode and the conductive material layer. It enables controlled modulation of ionic species distribution in the conductive material layer through gate voltage application, providing a predictable and reliable mechanism for resistive state control without direct contact or unpredictable filament formation between electrodes.
2Measurement precision
If gate electrode and gate dielectric layer are added to control ionic species distribution, then precision control over resistive states is achieved, but device structure becomes more complex
Solution Approach 1:
The gate electrode and gate dielectric layer structure serves multiple functions: it controls ionic species distribution in the conductive material layer, enables precise tuning of lateral and vertical resistive states, and provides nonvolatile memory functionality. This multi-functionality achieves high precision control while the added structural complexity is justified by the multiple capabilities provided by the gate structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables reliable and predictable switching between resistive states by controlling interfacial and bulk chemistry, avoiding dielectric breakdown and allowing for multi-bit storage and efficient resistance tuning.
Implementation Method 1
The gate dielectric layer is configured to supply to, or receive from, the conductive material layer, an amount of the at least one ionic species
Implementation Method 2
a first potential difference applied in a first direction between the gate electrode layer and the conductive material layer modifies a proportionate amount of the at least one ionic species in a portion of the conductive material layer to generate a first memristive state including a first lateral resistive state
Data Source
AI summary
Systems, methods, and apparatus are provided for tuning a memristive property of a device. The device (500) includes a layer of a dielectric material (507) disposed over and forming an interface with a layer of an electrically conductive material (506), and a gate electrode (508) disposed over the dielectric material. The dielectric material layer includes at least one ionic species (302) having a high ion mobility. The electrically conductive material is configured such that a potential difference applied to the device can cause the at least one ionic species to migrate reversibly across the interface into or out of the electrically conductive material layer, to modify the resistive state of the electrically conductive material layer.