Centrosymmetric Mott Insulators for Low-Voltage Resistive Switching Memory
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Solution Overview
Problem
Current non-volatile memory technologies, such as Flash memories, face limitations in cycle life, high write and erase times, and size reduction, while RRAM and MEMRISTORS are still poorly understood and not fully meeting industrial requirements for switching voltage, temperature, memory window, lifetime, and integration.
Innovation Solution
The use of centrosymmetric Mott insulators, such as NiS2-xSex and V2-xMxO3, which exhibit reversible resistive switching induced by electric pulses, allowing for low-voltage switching between distinct resistance states, increasing data storage density, and enabling reproducible switching cycles at room temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Flash memory is used for non-volatile storage, then data retention is achieved, but writing and erasing times are long (greater than 10 μs and 1 ms respectively) and high voltages (greater than 10 V) are required
Solution Approach 1:
The patent changes the fundamental operating parameters of the memory system by using Mott insulator materials that exhibit resistive switching at low voltages (less than 10 V) and achieve switching times in the nanosecond range (100 ns), dramatically improving both speed and energy efficiency while maintaining non-volatile data retention
Solution Approach 2:
The invention exploits the metal-insulator phase transition in Mott insulator materials, where application of an electric field induces a transition from insulating to metallic state and back, enabling fast and reversible resistive switching for memory storage without requiring high voltages or long operation times
2Reliability
If Flash memory is used for non-volatile storage, then data retention is achieved, but high voltages (greater than 10 V) are necessary to carry out data storage
Solution Approach 1:
The patent fundamentally changes the voltage parameter requirement by utilizing Mott insulator materials that enable resistive switching at low voltages (less than 10 V), thereby reducing energy consumption and eliminating the need for high-voltage charge pumps and complex voltage generation circuits required by Flash memory
3Speed
If RRAM memories and MEMRISTORS are used as alternatives, then switching speed is improved (100 ns pulses), but the underlying physicochemical phenomena are poorly understood and poorly controlled
Solution Approach 1:
The patent identifies and exploits the specific parameter range (electric field strength, temperature, pulse duration) that triggers the metal-insulator transition in Mott insulators, enabling controlled and reproducible resistive switching behavior with well-defined physicochemical mechanisms based on strong electron correlations and band structure effects
4Speed
If current RRAM and MEMRISTOR technologies are used, then switching speed is improved, but they fail to meet industrial requirements for switching voltage, temperature, memory window, lifetime and integration
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: operating temperature (room temperature operation), switching voltage (low voltage less than 10 V), memory window (distinct resistance states), and material stability (reproducible cycling without degradation), thereby meeting comprehensive industrial requirements for reliability and manufacturability
Solution Approach 2:
The invention uses composite structures combining Mott insulator active material with electrode materials, creating a integrated device architecture that simultaneously addresses switching performance, thermal management, electrical contact, and manufacturability for industrial application
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 provides a material for resistive switching memory that achieves low-voltage switching, improved switching times, and increased data storage density, making it suitable for industrial applications in RRAM and MEMRISTORS, overcoming the limitations of existing technologies.
Implementation Method 1
an electric field of a predetermined value is applied to form, by electronic avalanche effect in the material, an elementary information cell containing at least two logical states
Implementation Method 2
the effect of the electric field on these materials makes it possible to create a dielectric breakdown by electronic avalanche effect which has the consequence of locally destroying the insulating state of Mott and restoring a metallic state
Implementation Method 3
The successive application of electric pulses in fact makes it possible to vary, in a volatile or non-volatile manner, the resistance of these materials between at least two distinct resistance states, and this in a reversible manner
Data Source
Figure 1~3d
Figure 4~5
Figure 6a~6c
AI summary
The invention relates to the use of a material (1) belonging to the family of centrosymmetric Mott insulators as an active material in a resistively switched memory for storing data. The material is placed between two electrical electrodes (2), by virtue of which an electric field of a preset value is applied in order to form, by way of an electron avalanche effect, an elementary information cell that has at least two logic states.