Antifuse Element With 3D Dielectric Structure For Miniaturization
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Solution Overview
Problem
Antifuse elements in integrated circuits occupy a large footprint and require high current density and electric fields, making them unsuitable for further miniaturization and efficient programming in high-density semiconductor devices.
Innovation Solution
The antifuse element design includes a conductive region in a semiconductor substrate with a dielectric layer and conductive plugs, where the dielectric layer implements electrical isolation and enhances electric fields for accelerated breakdown, allowing for simpler on-chip programming voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional antifuse structures are used, then electrical isolation and programming function are achieved, but the footprint area is large and high current density is required
Solution Approach 1:
The dielectric layer is configured with a first dielectric portion extending in a second direction (perpendicular to current flow) and a second dielectric portion extending in the first direction (parallel to current flow). This three-dimensional dielectric structure provides electrical isolation without requiring larger lateral dimensions, thereby reducing footprint area while maintaining isolation effectiveness.
Solution Approach 2:
The dielectric layer is positioned specifically over the conductive region where breakdown is desired, creating localized high electric field regions. This concentrated dielectric structure enables breakdown at lower current densities compared to conventional distributed isolation structures, reducing the overall current density requirement.
2Productivity
If antifuse elements are miniaturized, then integration density is improved, but breakdown conditions become difficult to achieve
Solution Approach 1:
The dielectric layer thickness is optimized to approximately 5 nm, creating a critical dimension that enables reliable breakdown at reduced scales. This specific thickness parameter allows the antifuse element to achieve breakdown under minimized dimensions while maintaining sufficient reliability for programming operations.
Solution Approach 2:
By extending the dielectric layer in both the second direction (perpendicular to current) and first direction (parallel to current), the structure creates enhanced electric field confinement in three dimensions. This multi-directional extension maintains effective breakdown conditions even as the overall device footprint is reduced for higher integration density.
3Reliability
If complex programming circuitry is used, then reliable programming is achieved, but device complexity increases
Solution Approach 1:
The dielectric layer structure itself generates the necessary high electric field conditions for breakdown through its geometric configuration and material properties. The first and second dielectric portions work together to concentrate and enhance the electric field, enabling the antifuse element to self-program with simpler external circuitry compared to conventional designs requiring complex voltage multiplication circuits.
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 design improves the performance of antifuse elements by optimizing the structure for enhanced electric fields, enabling efficient dielectric breakdown and reducing the complexity of programming circuitry, thus supporting higher integration densities and efficient data storage.
Implementation Method 1
the dielectric layer and the conductive region have a second overlapping area therebetween, wherein a ratio of an area of the first overlapping area to an area of the second overlapping area is about 1.5:1 to 2.5:1
Implementation Method 2
enhances electric fields that accelerate dielectric breakdown
Data Source
AI summary
An antifuse element includes a conductive region formed in a semiconductor substrate extending in a first direction, a dielectric layer formed on a portion of the conductive region, a first conductive plug formed on the dielectric layer, a second conductive plug formed on another portion of the conductive region, a first conductive member formed over the first conductive plug, and a second conductive member formed over the second conductive plug. The dielectric layer has a first dielectric portion extending in a second direction, and a second dielectric portion extending in the first direction, in which the dielectric layer implements an electrical isolation between the conductive region and the first conductive plug. The first conductive plug has a first region of a first width and a second region of a second width, and the first width is greater than the second width.