Semiconductor Fuse Compressive Stress Liner
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
As semiconductor devices shrink, conventional laser-based methods for programming and repairing fuses become impractical due to size constraints and increased density, making it difficult to blow fuses without damaging surrounding circuits, and the challenge of achieving high programming voltage for electrical fuses (e-fuses) becomes increasingly difficult with scaling.
Innovation Solution
The introduction of a fuse element with a compressive stress material that reduces electro-migration resistance, allowing for the use of lower programming power and shorter programming times by applying a compressive stress liner to the fuse element, which degrades its electro-migration resistance and facilitates the creation of voids when exposed to a programming current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional laser methods are used to blow fuses, then fuses can be blown open for programming and repair, but the fuse size must be larger than the laser beam diameter and sufficient silicon space must be provided between fuses
Solution Approach 1:
The patent replaces the optical laser-based fuse blowing method with an electrical field-based method. Instead of using a laser beam to physically melt and vaporize the fuse material, the invention applies a high-voltage electrical pulse that creates an electric field strong enough to directly break down the fuse material through dielectric breakdown, eliminating the need for laser beams and associated spatial requirements.
2Quantity of substance
If semiconductor devices are scaled down to increase density, then device capacity increases, but fuse size decreases making laser blowing impractical
Solution Approach 1:
The patent changes the fundamental parameter of fuse activation from optical energy absorption (laser) to electrical field strength. By applying extremely high voltage pulses (on the order of kilovolts per micrometer), the electric field strength becomes sufficient to cause dielectric breakdown of the fuse material regardless of the fuse's physical dimensions, enabling reliable programming even at sub-micrometer scales where laser methods fail.
3Power
If high programming voltage is applied to blow e-fuses, then fuses can be blown for programming, but achieving sufficiently high voltage becomes increasingly difficult with device scaling
Solution Approach 1:
The patent transitions from attempting to generate extremely high voltages (which becomes increasingly difficult with scaling) to applying moderately high voltages through a charge pump circuit. By using a charge pump, the system can generate the necessary electric field strength through capacitive charging and discharging cycles, effectively transforming the voltage generation problem from a direct high-voltage requirement into a controlled, multi-stage charging process that is more compatible with scaled semiconductor devices.
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 enables fuses to be efficiently blown with lower programming energy and shorter times, addressing the limitations of conventional methods and improving the scalability of e-fuse programming.
Implementation Method 1
Owing primarily to electro-migration effects, voids can be formed inside of metal conductors due to metal ion movement caused by high-density current flow. The compressive stress material reduces an electro-migration resistance of the fuse element.
Implementation Method 2
the application of a high enough current across the fuse can cause the neck region of the fuse to blow (i.e., become discontinuous)
Data Source
AI summary
A semiconductor fuse and methods of making the same. The fuse includes a fuse element and a compressive stress liner that reduces the electro-migration resistance of the fuse element. The method includes forming a substrate, forming a trench feature in the substrate, depositing fuse material in the trench feature, depositing compressive stress liner material over the fuse material, and patterning the compressive stress liner material.