Undercut Electrode Crossbar Array for Low Resistance Scaling
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Solution Overview
Problem
Current crossbar array devices face challenges in miniaturizing contact size while maintaining low contact resistance, which is essential for scalable and efficient neuromorphic computing and high-density memory applications.
Innovation Solution
The implementation of scalable electrodes with undercuts in crossbar array devices, where an electrolyte layer is sandwiched between the main and scalable electrodes, allowing for controlled contact area and resistance, enabling high conductivity and miniaturization of active device areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the contact size is reduced for miniaturization, then the active device area is reduced, but the contact resistance increases
Solution Approach 1:
The electrode structure transitions from a two-dimensional planar contact to a three-dimensional undercut geometry. The scalable electrode layer is patterned to extend laterally beneath the main electrode, creating a tapered profile that increases the effective contact area with the electrolyte layer without increasing the top-down footprint. This dimensional transformation allows miniaturization of the device area while maintaining low contact resistance through the expanded lateral contact interface.
Solution Approach 2:
The electrode structure employs different geometries at different locations: the main electrode provides a broad top contact area for low resistance, while the undercut portion extends laterally beneath to increase the interface area with the electrolyte. This local geometric variation optimizes both the contact resistance and the active device area, allowing the same electrode to serve multiple functional requirements with different spatial characteristics.
2Reliability
If the contact area is increased to reduce contact resistance, then the conductivity improves, but the active device area increases
Solution Approach 1:
The undercut geometry of the scalable electrode layer creates additional lateral contact area beneath the main electrode without increasing the vertical footprint. By extending the electrode laterally in the third dimension (depth/beneath the surface), the contact area with the electrolyte is increased for lower resistance, while the top-down active device area remains minimized for high-density integration.
Data Source
AI summary
A cross bar array device includes first electrodes arranged adjacent to each other and extending in a first direction, the first electrodes including a main electrode layer and a scalable electrode layer. Second electrodes are arranged transversely to the first electrodes, the second electrodes including a main electrode layer and a scalable electrode layer. An electrolyte layer is disposed between the scalable electrode layers of the first electrodes and the second electrodes. A scalable electrode is formed from a scalable electrode layer and includes an undercut having a side laterally recessed from a width of a corresponding main electrode.