Nitrogen-Modified Tungsten Silicide for E-Fuse Resistance Control
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Solution Overview
Problem
Current semiconductor devices face challenges in forming efficient e-fuse and precision resistor structures that minimize power consumption and maximize speed, particularly in achieving low resistance and temperature coefficient of resistance (TCR) for one-time-programmable memory elements like E-fuses.
Innovation Solution
A method involving the deposition of a tungsten silicon layer with a specific silicon-to-tungsten ratio, followed by nitrogen introduction through low-temperature nitridation to form a nitrogen-containing tungsten silicon layer, which reduces resistance and TCR, and is used to create an electrical connection between conductive materials, enabling efficient e-fuse and resistor structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conducting material stripes are used for E-fuse structures, then the basic memory function is achieved, but the resistance and temperature coefficient of resistance (TCR) are not sufficiently low for high-performance applications
Solution Approach 1:
The patent applies parameter changes by modifying the composition parameters of the conducting material. Specifically, it uses tungsten silicide (WxSi100-x) where the tungsten content x is controlled within 5-50 atomic percent, and introduces nitrogen content controlled at 1-40 atomic percent. These compositional parameter changes enable precise control of resistance and TCR values to achieve the desired electrical characteristics for high-performance E-fuse structures
Solution Approach 2:
The patent employs composite materials by creating a multi-component system consisting of tungsten, silicon, and nitrogen. The tungsten silicide base material is further modified through nitrogen incorporation, forming a composite structure that combines the beneficial properties of each element: tungsten provides low resistivity, silicon enables compositional tuning, and nitrogen reduces TCR. This composite approach allows simultaneous optimization of multiple electrical parameters
2Speed
If high current pulses are used for electromigration programming, then programming speed is improved, but the material must withstand high stress without excessive resistance increase
Solution Approach 1:
The patent addresses material stability under high stress by optimizing the crystal structure and compositional distribution. The controlled formation of tungsten silicide with specific stoichiometry and nitrogen incorporation creates a more uniform and stable microstructure that can withstand the mechanical and electrical stress of high current pulses during electromigration programming, preventing excessive resistance increase while maintaining programming speed
3Reliability
If nitrogen is introduced into tungsten silicon layer, then resistance and TCR are reduced, but additional processing steps are required
Solution Approach 1:
The patent merges multiple functions into the nitrogen introduction step. The nitrogen incorporation process simultaneously achieves several objectives: it modifies the electrical properties to reduce resistance and TCR, stabilizes the material composition, and enhances the overall performance of the E-fuse structure. By combining these multiple benefits into a single processing step, the patent minimizes the increase in fabrication complexity while maximizing the improvement in electrical property stability
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
The approach results in reduced resistance and TCR, enhancing the performance of semiconductor devices by improving the transport properties of the material, making them suitable for high-density current pulses and electromigration programming.
Implementation Method 1
Nitrogen may be introduced into the tungsten silicon layer to form a nitrogen-containing tungsten silicon layer
Data Source
AI summary
A method for forming a precision resistor or an e-fuse structure where tungsten silicon is used. The tungsten silicon layer is modified by implanting nitrogen into the structure.