Semiconductor Fuse Structure With Nitride-Defined Breakdown Area
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Solution Overview
Problem
Fuses and anti-fuses in semiconductor devices occupy a large area, which is a challenge as semiconductor devices become more highly integrated, and there is a need for smaller size and favorable breakdown conditions to maintain device performance.
Innovation Solution
The use of a nitride layer to define a fuse blown area reduces the oxide breakdown area and increases the probability of successful fusion, while spacing the oxide breakdown location away from the transistor reduces the drain-gate short probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional fuse structures are used, then fuse functionality is achieved, but the area occupied by the fuse component becomes large
Solution Approach 1:
The patent transitions from a planar fuse structure to a three-dimensional stacked capacitor structure with bottom electrode, dielectric layer, and top electrode. This vertical stacking in the third dimension reduces the lateral footprint of the fuse component while maintaining its functionality, directly addressing the area reduction goal.
Solution Approach 2:
The fuse component is nested within the active area of the semiconductor device, with the bottom electrode positioned in the active area and the top electrode stacked above it. This nesting approach allows the fuse to share space with other device components, effectively reducing the overall area occupation.
2Reliability
If oxide breakdown area is reduced, then fuse success probability increases, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies local quality by creating a specific breakdown region within the dielectric layer through controlled oxide formation and nitride layer patterning. The breakdown is localized to a specific area defined by the opening in the nitride layer, ensuring predictable and controllable fuse activation while maintaining manufacturing feasibility.
Solution Approach 2:
The oxide layer is formed and the nitride layer is patterned with openings before the actual fuse activation process. This preliminary preparation of the breakdown path ensures that when the fuse is activated, the breakdown occurs at the predetermined location with high probability, reducing manufacturing variability.
3Reliability
If oxide breakdown location is spaced away from transistor, then drain-gate short probability reduces, but fuse component area increases
Solution Approach 1:
The patent uses vertical stacking to position the oxide breakdown location away from the transistor in the vertical dimension while maintaining compact lateral dimensions. The bottom electrode is in the active area, the dielectric layer extends upward, and the breakdown occurs in the upper portion, spatially separating it from the transistor structure below.
Solution Approach 2:
The nitride layer acts as an intermediary structure that defines the breakdown region and provides spatial separation between the fuse component and the transistor. By patterning the nitride layer with openings, the patent creates a controlled breakdown path that is physically separated from the transistor while maintaining a compact overall structure.
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 approach minimizes the oxide breakdown area of the fuse component and enhances the reliability of fuse components by reducing the likelihood of drain-gate shorts, thereby improving the integration and performance of semiconductor devices.
Implementation Method 1
forming an oxide layer in the opening to contact the first diffusion area... defines a first fuse blown area above the first diffusion area... oxide breakdown area of the fuse component
Data Source
AI summary
A method of manufacturing a semiconductor device is provided. The method includes providing a substrate having an active area and forming a first diffusion area in the active area. The method also includes disposing a nitride layer on the active area and forming an opening in the nitride layer to expose the first diffusion area. The method also includes disposing an oxide layer in the opening to contact the first diffusion area.