Nonvolatile Memory Resistance Change Layer Lateral Oxygen Enrichment
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Solution Overview
Problem
Conventional resistance change memory devices require inefficient initialization processes, high forming voltages, and high reset currents, which are exacerbated by downscaling, leading to increased power consumption and potential device destruction.
Innovation Solution
A nonvolatile memory device design featuring a resistance change layer with a lateral layer having a higher oxygen concentration, which facilitates easier oxygen supply and reduces reset current by providing an oxygen-rich layer on the lateral surface, allowing for lower forming voltages and improved efficiency in switching operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resistance change films are used, then the memory device can store data, but high forming voltage is required which may destroy the resistance change film
Solution Approach 1:
The patent introduces an oxygen-rich layer specifically at the lateral surface of the resistance change film, creating a localized region with different oxygen concentration. This local modification enables easier oxygen supply during reset operation without requiring high forming voltage throughout the entire structure, thus protecting the resistance change film from destruction while maintaining data storage capability.
Solution Approach 2:
The oxygen-rich layer is formed in advance during the manufacturing process, pre-positioning oxygen at the lateral surface before device operation. This preliminary action ensures that oxygen is readily available during reset operations, eliminating the need for high forming voltages that would otherwise be required to supply oxygen during operation, thereby preventing film destruction.
2Reliability
If conventional resistance change films are used, then data storage is achieved, but large reset current is required which increases power consumption
Solution Approach 1:
By concentrating oxygen enrichment at the lateral surface rather than throughout the entire resistance change film, the patent creates a localized region that facilitates efficient oxygen supply during reset operation. This local modification reduces the total current required for reset compared to conventional uniform structures, thereby reducing power consumption while maintaining effective reset operation.
Solution Approach 2:
The oxygen-rich layer acts as an intermediary that facilitates oxygen supply to the resistance change film during reset operation. This intermediate oxygen reservoir enables easier oxygen transport, reducing the electrical current needed to achieve the same reset effect, thus lowering power consumption while maintaining reset effectiveness.
3Productivity
If device downscaling is performed, then capacity is increased, but reset current reduction effect is decreased
Solution Approach 1:
The patent's approach of enriching oxygen at the lateral surface creates a scalable structure where the oxygen-rich region scales proportionally with device downsizing. This localized oxygen reservoir maintains its effectiveness even as device dimensions decrease, ensuring that reset current reduction is preserved across different device scales, unlike conventional approaches where the effect diminishes with downsizing.
Solution Approach 2:
Instead of relying on vertical oxygen supply paths that become less effective with downsizing, the patent utilizes the lateral dimension by creating an oxygen-rich layer at the lateral surface. This dimensional shift enables oxygen supply efficiency to be maintained even as device cross-sectional dimensions decrease, allowing capacity increase through downsizing without sacrificing reset current reduction.
4Reliability
If initialization process (forming) is performed, then resistance change film becomes operational, but process efficiency is reduced
Solution Approach 1:
The oxygen-rich layer is formed during the manufacturing process in advance of device operation. This preliminary oxygen positioning eliminates or simplifies the initialization (forming) process that would otherwise be required to activate the resistance change film, thereby improving process efficiency while ensuring reliable film activation. The pre-positioned oxygen removes the need for time-consuming forming operations.
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 reduces reset current and power consumption, enhances the efficiency of the forming process, and stabilizes the resistance change layer, enabling reliable operation even in downscaled devices.
Implementation Method 1
a first lateral layer provided on a lateral surface of the first resistance change layer and having an oxygen concentration higher than an oxygen concentration in the first resistance change layer
Data Source
AI summary
A nonvolatile memory device includes: a first conductive layer; a second conductive layer; a first resistance change layer provided between the first conductive layer and the second conductive layer and having an electrical resistance changing with at least one of an applied electric field and a passed current; and a first lateral layer provided on a lateral surface of the first resistance change layer and having an oxygen concentration higher than an oxygen concentration in the first resistance change layer.