Flexible Non-Volatile Memory Using AZTO Resistive Switching
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Solution Overview
Problem
Conventional non-volatile memory devices, such as flash memory, face issues with high operating voltage, slow rewriting speed, limited rewrites, and reliability due to thin gate oxide layers, while flexible electronic devices require materials and designs that ensure endurance under frequent switching and bending.
Innovation Solution
A flexible non-volatile memory is manufactured using a flexible substrate with a planarization layer, a metal bottom electrode layer, an AZTO resistive switching layer, and a top electrode layer, allowing for the formation of electrically independent cells that can switch between resistance states efficiently and maintain performance under bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional flash memory devices are used, then non-volatile storage is achieved, but high operating voltage, slow rewriting speed, and limited rewrites occur
Solution Approach 1:
The patent changes the fundamental operating principle from charge storage (flash memory) to resistance switching (metal oxide layer). By applying voltage pulses, the metal oxide layer transitions between high-resistance and low-resistance states, enabling fast rewriting without the voltage and endurance limitations of conventional flash memory
Solution Approach 2:
The patent replaces the charge-based storage mechanism with a resistance-based mechanism using metal oxide layers. This substitution eliminates the need for thick gate oxide layers and high operating voltages, enabling faster rewriting and improved endurance through electroresistive switching
2Volume of moving object
If gate oxide layer is made thinner to reduce device size, then smaller device size is achieved, but leakage current increases
Solution Approach 1:
The patent replaces charge-based storage with resistance-based storage using metal oxide layers. This substitution eliminates the need for thin gate oxide layers, as the resistance switching occurs in the metal oxide layer itself, thereby eliminating leakage current issues while maintaining small device size
Solution Approach 2:
The patent changes the storage mechanism from electrical charge to electrical resistance. By using voltage-controlled resistance switching in metal oxide layers, the device achieves small size without the harmful leakage effects associated with thin oxide layers in conventional memory
3Adaptability or versatility
If flexible substrate is used for flexible devices, then flexibility is achieved, but endurance under frequent bending and switching deteriorates
Solution Approach 1:
The patent uses a flexible substrate with thin film layers including metal bottom electrode, metal oxide resistive switching layer, and metal top electrode. This thin-film structure on flexible substrate maintains device flexibility while the robust metal oxide layer ensures endurance under frequent bending and switching operations
Solution Approach 2:
The patent creates a composite structure combining flexible substrate with multiple functional thin films (metal electrodes and metal oxide layer). This composite design integrates flexibility from the substrate with the endurance and switching characteristics of the metal oxide layer, achieving both flexibility and reliability
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
The solution enables a flexible non-volatile memory with low operating voltage, fast rewriting speed, high endurance, and reliability, suitable for flexible electronic devices, with the AZTO resistive switching layer demonstrating excellent switching characteristics and data retention even after repetitive bending and switching.
Implementation Method 1
An external bias voltage is used to modify the resistance of the devices to perform the read and the write operations such that the devices can switch between a high resistance state and a low resistance state corresponding to the states of '0' and '1' of the digital signal
Implementation Method 2
The resistive switching layer formed by the metal oxide is the most important and the most studied part of the resistive non-volatile memory devices
Data Source
AI summary
A manufacturing method for manufacturing a flexible non-volatile memory is provided. The manufacturing method comprises the steps outlined below. A flexible substrate is provided. A planarization layer is formed on the flexible substrate. A metal bottom electrode layer is deposited on the planarization layer. A mask is formed to define a plurality of patterns. An AZTO layer having a plurality of electrically independent AZTO cells is deposited on the metal bottom electrode layer corresponding to the patterns. A top electrode layer is deposited on the AZTO layer corresponding to the AZTO cells to form a plurality of non-volatile memory cells.