Selector Device Operating Method for 3D Memory Stability
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Solution Overview
Problem
The selector devices in 3D crosspoint memory systems, particularly those containing active metal, face challenges with stability and short lifespan due to easy formation of stable conductive paths, leading to reduced performance and reliability.
Innovation Solution
An operating method is developed to improve the selector device performance by determining and applying specific DC or AC operating voltages and limit currents to reduce and then increase the off-state resistance, followed by adjusting the voltage and current for stable switching, utilizing a structure with active metal electrode layers and a switch layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the selector device contains active metal, then the device can be easily formed and manufactured, but the device forms stable conductive paths too easily causing poor stability and short lifespan
Solution Approach 1:
The patent applies preliminary action by performing a forming operation before normal operation to create a controlled conductive path. The forming voltage is applied once during initialization to establish the conductive path, preventing it from forming spontaneously during normal operation. This resolves the contradiction by allowing easy manufacturing through simple structure while ensuring stability through pre-established controlled conduction paths.
Solution Approach 2:
The patent changes parameters by applying different voltage levels for different operations: a high forming voltage to create the conductive path, and then a lower operating voltage for normal operation. This parameter differentiation ensures that the conductive path forms easily during manufacturing (high voltage) but remains stable during use (lower voltage), resolving the contradiction between ease of formation and operational stability.
2Ease of manufacture
If the selector device contains active metal, then the device can be easily formed and manufactured, but the device has short lifespan due to easy formation of stable conductive paths
Solution Approach 1:
The forming operation is performed as a preliminary action during device initialization, creating a stable conductive path before normal operation begins. This one-time forming event during manufacturing or initialization extends the device lifespan by establishing a reliable conduction path that won't form or break spontaneously during the device's operational life, thus resolving the contradiction between ease of formation and lifespan.
3Ease of operation
If the selector device is opened for each read or write operation, then the memory element can be accessed, but the selector device experiences high stress and reduced lifespan
Solution Approach 1:
The conductive path is preliminarily formed during device initialization, creating a stable low-resistance state that persists through multiple read and write operations. This eliminates the need to repeatedly open and close the selector for each operation, as the pre-formed conductive path remains stable. This resolves the contradiction by maintaining ease of operation (the path is already open) while dramatically extending selector lifespan by eliminating repeated switching stress.
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 method enhances the operating stability and lifespan of the selector device, reduces power consumption, and simplifies circuit design by maintaining optimal voltage levels, thereby improving the overall performance and reliability of the selector device.
Implementation Method 1
The determined operating voltage and limit current are applied to the selector device, so that the selector device circulates under DC or AC until an off-state resistance is reduced
Implementation Method 2
the selector device containing active metal... At least one of the first metal electrode layer, the second metal electrode layer, or the switch layer contains active metal
Data Source
AI summary
An operating method for improving the performance of a selector device is provided, including: determining and applying a direct current (DC) or alternating current (AC) operating voltage and a limit current of the selector device, so that the selector device circulates until a off-state resistance is reduced; continuously applying the operating voltage and the limit current to the selector device, so that the selector device circulates until the off-state resistance is reduced to a minimum value; continuously applying the operating voltage and the limit current to the selector device, so that the selector device circulates until the off-state resistance is increased; continuously applying the operating voltage and the limit current to the selector device, so that the selector device circulates until the off-state resistance is increased to a maximum value; and adjusting the operating voltage and the limit current, and performing DC or AC operation pulsed operation on a selector.