Semiconductor Fuse Layout With Localized Oxide Breakdown
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Solution Overview
Problem
Fuses and anti-fuses occupy a large area in semiconductor devices, posing a challenge as devices become more highly integrated, and there is a need for smaller and more reliable fuse components with favorable breakdown conditions.
Innovation Solution
The use of a nitride layer to define the fuse blown area in semiconductor devices, reducing the oxide breakdown area and increasing the probability of successful fusing, while spacing the breakdown location away from the transistor to minimize drain-gate shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If traditional fuse structures are used, then fuse functionality is achieved, but the fuse occupies a large area
Solution Approach 1:
The patent applies local quality by creating a localized high-field region within the oxide layer through specific electrode geometry and positioning. The oxide layer is positioned to create concentrated electric field lines between the bottom electrode and top electrode, ensuring breakdown occurs at a specific localized point rather than uniformly across the entire fuse area. This localized breakdown region reduces the effective area occupied by the fuse while maintaining reliable breakdown functionality.
Solution Approach 2:
The patent utilizes vertical stacking of electrodes and oxide layers to reduce the horizontal footprint of the fuse. By arranging the bottom electrode, oxide layer, and top electrode in a vertical configuration, the fuse structure achieves three-dimensional utilization of space, significantly reducing the area occupied on the semiconductor substrate while maintaining the necessary breakdown characteristics through controlled vertical field distribution.
2Area of moving object
If oxide breakdown area is reduced, then integration density is improved, but the probability of successful fusing may decrease
Solution Approach 1:
The patent applies parameter changes by carefully controlling the thickness, material composition, and positioning of the oxide layer to optimize the electric field distribution. By adjusting these parameters, the breakdown field strength is concentrated in a smaller volume, achieving both reduced breakdown area and maintained fusing probability. The specific oxide material selection and thickness control ensure predictable breakdown characteristics at the reduced scale.
Solution Approach 2:
The patent ensures high fusing probability in the reduced breakdown area by creating a localized region with optimized dielectric properties. The oxide layer is positioned and dimensioned to create a high-electric-field zone with controlled breakdown characteristics, ensuring that even though the overall breakdown area is reduced, the local field strength and breakdown reliability are enhanced through precise geometric control and material selection.
3Reliability
If breakdown location is spaced from transistor, then drain-gate short probability is reduced, but fuse area increases
Solution Approach 1:
The patent resolves the spacing conflict by transitioning to a vertical architecture where the breakdown location is positioned in the vertical dimension above or below the transistor plane, rather than requiring horizontal separation. The oxide breakdown region is localized in the vertical stack, allowing the fuse component to be positioned closer to the transistor in the horizontal plane without increasing the risk of drain-gate shorts, as the actual breakdown occurs in the vertically-stacked oxide layer away from the transistor channel region.
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 reduces the oxide breakdown area and enhances the reliability of fuse components, minimizing drain-gate short probability and improving integration efficiency in semiconductor devices.
Implementation Method 1
disposing an oxide layer in the opening to contact the first diffusion area
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.