Nonvolatile Memory Electrodes With Tapered Walls
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Solution Overview
Problem
Cross-point nonvolatile memory devices face limitations in bit density improvement due to weakened adhesion between finer interconnects and the substrate, leading to reduced reliability.
Innovation Solution
The design includes lower and upper side electrodes with forward-tapered and reverse-tapered side walls, respectively, separated by insulating layers, allowing for a higher bit density configuration without compromising adhesion and reliability, achieved through a manufacturing process involving the formation of electrodes with insulating spacer layers and conductor filling between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the bit density is increased by making interconnects finer, then the bit density improves, but the adhesion between interconnects and substrate weakens
Solution Approach 1:
The patent transitions from planar 2D interconnect layout to a 3D structure by forming electrodes with tapered side walls that extend vertically. The first electrode has a forward taper and the second electrode has a reverse taper, creating an interdigitated three-dimensional configuration that increases contact surface area and improves adhesion while maintaining high bit density.
Solution Approach 2:
The patent changes the geometric parameters of the electrodes by forming tapered side walls with specific angles. The forward-tapered first electrode and reverse-tapered second electrode create optimized contact surfaces that enhance adhesion strength. This parameter change allows finer interconnects to maintain reliable adhesion despite reduced dimensions.
2Quantity of substance
If the interconnect width is reduced to increase bit density, then the bit density improves, but the reliability decreases
Solution Approach 1:
The patent moves from two-dimensional planar interconnects to three-dimensional tapered structures. The vertical extension and interdigitated arrangement of the first and second electrodes with opposite tapers create additional contact area and structural integrity, compensating for the reduced horizontal dimensions and maintaining reliability at higher density.
Solution Approach 2:
The patent employs a composite structure combining insulating layers with tapered conductive electrodes. The insulating layer separates the first and second electrodes while the tapered conductive portions provide enhanced mechanical and electrical reliability. This composite approach allows finer interconnects to maintain structural soundness and operational reliability.
Data Source
AI summary
A nonvolatile memory device, includes: a lower side electrode aligned in a first direction; an upper side electrode positioned above the lower side electrode and aligned in a second direction intersecting the first direction; and a memory unit provided between the lower side electrode and the upper side electrode. At least one selected from the lower side electrode and the upper side electrode includes a first electrode and a second electrode, the first electrode having a forward-tapered side wall, the second electrode having a reverse-tapered side wall and being adjacent to the first electrode via an insulating layer in substantially identical plane.