Intermediate Layer Adhesion in Resistance Change Memory Devices
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Solution Overview
Problem
The reliability of two-terminal nonvolatile resistance change memory devices, such as CBRAM, is compromised by low adhesiveness between the resistance change layer and the second electrode, leading to peeling issues during manufacturing, which affects the device's performance and longevity.
Innovation Solution
Incorporating an intermediate layer with good adhesiveness between the second electrode and the insulating section, which enhances the contact reliability between the second electrode and the resistance change layer, thereby preventing peeling and improving the overall reliability of the memory device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an intermediate layer is added between the second electrode and the insulating section, then the adhesiveness and contact reliability are improved, but the device structure becomes more complex
Solution Approach 1:
An intermediate layer comprising a first layer and a second layer is introduced between the second electrode and the insulating section. The first layer has good adhesiveness to the insulating section, while the second layer has good adhesiveness to the second electrode, thereby resolving the adhesion problem without requiring direct contact between incompatible materials.
2Device complexity
If the resistance change layer and second electrode are directly contacted, then the device structure is simple, but peeling occurs during manufacturing reducing reliability
Solution Approach 1:
The intermediate layer acts as a mediator between the resistance change layer and the second electrode, preventing direct contact that causes peeling. The layered structure of the intermediate layer provides gradual transition in material properties, reducing stress concentration and preventing delamination during manufacturing processes.
3Quantity of substance
If miniaturization is advanced to increase capacity, then the storage capacity increases, but the manufacturing precision requirements become more stringent
Solution Approach 1:
The intermediate layer is divided into two distinct layers with different functional properties. This segmentation allows each layer to be optimized for specific adhesion requirements, making the overall structure more robust against manufacturing variations and enabling reliable miniaturization.
Solution Approach 2:
Different regions of the intermediate layer structure have different material compositions and properties tailored to specific local requirements - the first layer optimizes adhesion to the insulating section while the second layer optimizes adhesion to the electrode, allowing the structure to maintain reliability at smaller dimensions.
Data Source
AI summary
According to one embodiment, a memory device includes a first electrode, a first resistance change layer, a first insulating section, a second electrode and an intermediate layer. The first resistance change layer is provided on the first electrode. The first insulating section is provided on the first resistance change layer. The second electrode is provided on the first resistance change layer. The second electrode is in contact with the first resistance change layer. The intermediate layer is provided between the second electrode and the first insulating section. The intermediate layer is in contact with the second electrode and the first insulating section.