Antifuse Gate Oxide Dip for Controlled Rupture
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Solution Overview
Problem
Existing antifuse elements in semiconductor devices face challenges such as high programming voltage, long programming time, and resistance variation due to random rupture locations in the gate oxide, which affect reliability and efficiency.
Innovation Solution
The antifuse element is designed with a unique gate oxide structure featuring a double gate oxide mask layer creating a thin and thick oxide portion with an oxide dip, concentrating the electric field for controlled rupture at a specific point, reducing programming voltage and time, and minimizing resistance variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional antifuse element with uniform gate oxide is used, then the structure is simple to manufacture, but the rupture location is random causing large resistance variation and reliability issues
Solution Approach 1:
The gate oxide structure is designed with non-uniform thickness, featuring a thinner region beneath the gate electrode compared to surrounding areas. This local variation in oxide thickness creates a concentrated electric field in the thin region, ensuring that rupture occurs at a predictable location directly beneath the gate electrode rather than randomly throughout the oxide layer.
Solution Approach 2:
The gate oxide is segmented into regions of different thicknesses - a thin central region under the gate electrode and thicker peripheral regions. This segmentation allows the electric field to be spatially differentiated, concentrating the breakdown field in the thin region while maintaining structural integrity in thicker areas,从而实现可控的局部击穿。
2Reliability
If a thick gate oxide is used, then the dielectric strength is higher providing better insulation, but the programming voltage and time increase significantly
Solution Approach 1:
The gate oxide thickness is optimized with a thin central region (e.g., 50-100 nm) beneath the gate electrode to reduce breakdown voltage and enable low-power programming, while peripheral regions maintain greater thickness for reliable insulation. This spatial differentiation allows the structure to exhibit both low programming voltage and high dielectric strength simultaneously.
Solution Approach 2:
Instead of using a uniformly thin oxide layer throughout, the solution introduces vertical dimensionality variation in oxide thickness. The multi-level oxide structure (thin central region + thicker peripheral regions) allows the system to achieve low breakdown voltage in the critical programming path while maintaining high insulation in other regions, effectively resolving the voltage-strength tradeoff through dimensional differentiation.
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 controlled rupture location, lower programming voltage, decreased programming time, and reduced resistance variation, enhancing the reliability and efficiency of the antifuse element.
Implementation Method 1
a gate oxide layer including one of a gate oxide dip or a gate oxide undercut... concentrating the electric field for controlled rupture at a specific point
Implementation Method 2
a voltage between the gate electrode and the active area creates a current path through the gate oxide layer and a rupture of the gate oxide layer in a rupture region
Data Source
AI summary
An antifuse element (102, 152, 252, 302, 352, 402, 602, 652, 702) and method of fabricating the antifuse element, including a substrate material (101) having an active area (106) formed in an upper surface, a gate electrode (104) having at least a portion positioned above the active area (106), and a gate oxide layer (110) disposed between the gate electrode (104) and the active area (106). The gate oxide layer (110) including the fabrication of one of a gate oxide dip (128) or a gate oxide undercut (614). During operation a voltage applied between the gate electrode (104) and the active area (106) creates a current path through the gate oxide layer (110) and a rupture of the gate oxide layer (110) in a rupture region (130). The rupture region (130) defined by the oxide structure and the gate oxide dip (128) or the gate oxide undercut (614).