Correlated Electron Switch for Scalable Non-Volatile Memory
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Solution Overview
Problem
Current non-volatile memory technologies face challenges in scalability, endurance, and energy efficiency, particularly below 65 nanometers, with existing solutions like flash memory not easily scalable and other technologies like ReRAM/CBRAM exhibiting unstable resistance switching and fatigue over many memory cycles.
Innovation Solution
The use of a Correlated Electron Material (CEM) to form a Correlated Electron Switch (CES) element, which undergoes an abrupt conductor/insulator transition via a quantum mechanical Mott transition, allowing for efficient and stable resistive switching without the need for electroforming, using materials like nickel oxide or other transition metal oxides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If flash memory devices are used, then high bit density and non-volatility are achieved, but scalability below 65 nanometers is difficult
Solution Approach 1:
The patent changes the fundamental operating parameters of memory devices by using correlated electron materials that exhibit Mott transitions, enabling resistance switching at lower voltages and smaller dimensions compared to traditional flash memory, thus improving scalability while maintaining density
Solution Approach 2:
The patent employs composite material structures involving correlated electron materials combined with conventional memory architecture elements, creating a hybrid system that leverages the unique electronic properties of CEMs to achieve both high density and scalability
2Reliability
If ReRAM/CBRAM materials are used, then resistive switching is achieved, but stability degrades over many memory cycles due to fatigue
Solution Approach 1:
The patent utilizes the transient nature of Mott transitions in correlated electron materials, where the resistance state is maintained through quantum mechanical effects rather than permanent structural changes, enabling stable operation over billions of cycles without the fatigue problems of filament-based ReRAM
Solution Approach 2:
The patent exploits the reversible Mott transition parameter change in correlated electron materials, where electron correlation strength can be tuned to achieve stable resistance states that maintain their integrity over extended periods and numerous cycling operations
3Reliability
If phase change memory materials are used, then resistance change occurs with phase transition, but control precision is insufficient for useful memory operation
Solution Approach 1:
The patent applies parameter changes by utilizing the Mott transition in correlated electron materials, where electron correlation strength and carrier concentration can be precisely controlled through voltage and temperature parameters, enabling reliable switching between conductive and insulating states with better control than phase change materials
4Reliability
If traditional EEPROM devices are used, then non-volatility is achieved, but write/erase time is slow and high voltage is required
Solution Approach 1:
The patent replaces the mechanical/electrical tunneling process of traditional EEPROM with a quantum mechanical Mott transition in correlated electron materials, enabling faster switching speeds while maintaining non-volatility through the stability of the resistive states
Solution Approach 2:
The patent changes the voltage parameter requirements by using correlated electron materials that can switch states at lower voltages through Mott transitions, eliminating the need for high voltage (12-21 volts) required by traditional EEPROM while maintaining non-volatile operation
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 a memory device with improved scalability, endurance, and reduced energy consumption by allowing rapid switching between conductive and insulative states, maintaining stability over many cycles and reducing operational energy needs.
Implementation Method 1
a Correlated Electron Material (CEM) to form a Correlated Electron Switch (CES) element, which undergoes an abrupt conductor/insulator transition via a quantum mechanical Mott transition
Data Source
AI summary
Disclosed are methods, systems and devices for operation of memory device. In one aspect, bit positions of a portion of a memory array may be placed in a first value state. Values to be written to the bit positions may be determined subsequent to placement of the bit positions in the first value state. Values at selected ones of the bit positions may then be changed from the first value state to a second value state while maintaining remaining unselected ones of the bit positions in the first value state so that the bit positions store or represent the values determined to be written to the bit positions.