Fin-Based Anti-Fuse Device with Tunable Breakdown Voltage
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Solution Overview
Problem
Existing fin-based anti-fuse devices for integrated circuits lack the ability to precisely control breakdown voltages, leading to inconsistent performance in programming and reliability across different applications.
Innovation Solution
The development of fin-based anti-fuse devices with varying fin pitches and corresponding source and drain regions, allowing for tailored breakdown voltages by adjusting the fin pitch and width, enabling specific programming voltages to be applied for each device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing fin-based anti-fuse devices are used with fixed fin pitch, then device structure is simple, but breakdown voltage control precision is poor
Solution Approach 1:
The patent applies parameter changes by varying the fin pitch across different fins in the anti-fuse device. Specifically, different fins are designed with different pitch values (e.g., first fin pitch, second fin pitch, third fin pitch), which directly controls the breakdown voltage of each fin. This allows precise tuning of breakdown characteristics without fundamentally changing the device architecture.
Solution Approach 2:
The patent implements local quality by assigning different fin pitch parameters to different spatial locations within the device. Each fin or group of fins can have locally optimized pitch values tailored to specific breakdown voltage requirements, enabling differentiated control across the device structure while maintaining overall functional integration.
2Reliability
If single fin pitch is used in anti-fuse devices, then manufacturing process is simple, but programming reliability for different applications is inconsistent
Solution Approach 1:
The patent changes the fin pitch parameter across different fins to achieve consistent programming reliability. By carefully selecting and varying pitch values (e.g., first pitch, second pitch, third pitch), the device ensures reliable breakdown at programmed voltages across different application scenarios, while the variations are integrated into standard manufacturing flows.
Solution Approach 2:
The patent segments the fin structure into multiple groups with different pitch characteristics. This segmentation allows each segment to be optimized for specific programming requirements, improving overall reliability. The segmented approach is implemented through standard photolithography and etching processes that can handle multiple pitch values within the same device layer.
3Measurement precision
If fin pitch is increased in anti-fuse devices, then breakdown voltage increases, but device area increases
Solution Approach 1:
The patent applies local quality by assigning different fin pitch values to different fins or fin groups within the same device. This allows breakdown voltage tuning to be achieved locally at specific fins rather than uniformly across the entire device, enabling precise voltage control without proportionally increasing the overall device area.
Solution Approach 2:
The patent utilizes the spatial dimension across multiple fins to achieve breakdown voltage tuning. Instead of increasing pitch uniformly in one dimension across the entire device, the invention varies pitch values across different fins (spatial distribution), allowing voltage control through dimensional differentiation rather than uniform scaling.
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 allows for the precise tuning of breakdown voltages in anti-fuse devices, enhancing programming reliability and flexibility across different applications by varying the fin pitch and width, ensuring targeted breakdown voltages are achieved.
Implementation Method 1
the first anti-fuse device is adapted to breakdown when a first programing voltage is applied to the first anti-fuse device
Data Source
AI summary
One IC product disclosed herein includes, among other things, a semiconductor substrate, a first anti-fuse device formed on the semiconductor substrate, the first anti-fuse device comprising at least one first fin formed with a first fin pitch, a first source region and a first drain region, wherein the first anti-fuse device is adapted to breakdown when a first programing voltage is applied to the first anti-fuse device, and a second anti-fuse device formed on the semiconductor substrate, the second anti-fuse device comprising at least one second fin formed with a second fin pitch, a second source region and a second drain region, wherein the second anti-fuse device is adapted to breakdown when a second programing voltage is applied to the second anti-fuse device, wherein the first fin pitch is greater than the second fin pitch and wherein the first programming voltage is greater than the second programing voltage.