Antifuse Programming via Isolation Trench Current Path
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Solution Overview
Problem
Existing antifuse elements in semiconductor devices require excessive time to program and suffer from reliability issues due to resistance variation, impacting production rates and device performance.
Innovation Solution
The antifuse design includes a substrate with isolation trenches and an insulating layer between an electrode and the substrate, where the programming current flows through the insulating layer and under the trench, increasing heating and reducing programming time, and utilizing a dopant profile with a positive temperature coefficient to enhance reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional antifuse programming is used with intact dielectric layers, then programming reliability is maintained, but programming time becomes excessively long (10s to 100s of milliseconds)
Solution Approach 1:
The patent applies preliminary damage to the dielectric layer through controlled oxide thinning or defect introduction before programming. This pre-conditioning creates localized weak points that require less energy and time to rupture during programming, reducing programming time from 10s-100s of milliseconds to significantly faster cycles while maintaining reliability through the controlled nature of the pre-damage
2Loss of time
If high current is applied to program antifuses quickly, then programming time is reduced, but resistance variation increases and reliability decreases
Solution Approach 1:
The patent introduces localized defects or thinning at specific positions within the dielectric layer to create predetermined rupture points. This local modification concentrates the programming current at these specific locations, ensuring consistent rupture behavior and uniform resistance characteristics across all antifuses in the array, thereby improving reliability while enabling faster programming
3Manufacturing precision
If programming current flows only through the narrow dielectric path, then programming precision is maintained, but heating is insufficient and programming time increases
Solution Approach 1:
The patent extends the current path from a narrow vertical path through the dielectric to a broader path that flows laterally under the isolation trench. This dimensional extension allows current to distribute over a larger volume of material, generating sufficient heat for rapid programming while the predetermined rupture points ensure precise and consistent breakdown locations, maintaining programming precision
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 significantly reduces programming time and improves reliability by generating consistent heat across a wider area, leading to faster and more stable antifuse programming.
Implementation Method 1
the programming current flows through the insulating layer and under the trench, increasing heating
Data Source
AI summary
The embodiments described herein provide an antifuse that includes a substrate material and an isolation trench formed in the substrate material, where the isolation trench has a first side and a second side opposite the first side. An electrode is positioned above the substrate material and proximate to the first side of the isolation trench. An insulating layer is disposed between the electrode and the substrate material. So configured, a voltage or current applied between the electrode and the substrate material causes a rupture in the insulating layer and creates a current path through the insulating layer and under the isolation trench to the substrate material proximate the second side of the isolation trench.