E-Fuse Structure Using Conductive Oxide for Low-Power Switching
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Solution Overview
Problem
Existing e-fuse technologies in semiconductor devices face limitations such as high temperature requirements, scalability issues, poor reliability, and high defect densities, especially in advanced CMOS architectures, where they are not readily compatible with replacement metal gate processes and require large sizes and high electrical currents to function effectively.
Innovation Solution
The development of a semiconductor e-fuse structure comprising a conductive oxide of a first metal and a second metal region with a resistive oxide, which can be converted from a conductive to a resistive state using localized joule heating with lower power, allowing for scalability and reliability improvements by selecting metals with significant electronegativity differences to achieve the resistive state at ambient temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silicide-based e-fuses are used, then high temperature processing (>400°C) is required, but this limits scalability and compatibility with RMG processes
Solution Approach 1:
The patent changes the material composition parameter from silicide to metal oxide (e.g., tungsten oxide, molybdenum oxide) to enable e-fuse operation at lower temperatures compatible with RMG processes, while maintaining the resistive switching functionality through oxide phase transitions
Solution Approach 2:
The patent uses composite structures combining metal layers (e.g., tungsten, molybdenum) with oxide layers to create e-fuses that achieve both low-temperature processing compatibility and reliable resistive switching, avoiding the high-temperature requirements of pure silicide-based approaches
2Reliability
If metal e-fuses are used, then electromigration is required to blow the fuse, but this requires large size and high electrical current (1-10 V and 1-100 mA)
Solution Approach 1:
The patent replaces the electromigration-based mechanical failure mechanism with a resistive switching mechanism based on oxide phase transitions, enabling fuse blowing at much lower currents and voltages without requiring large device sizes or complex migration zone structures
Solution Approach 2:
The patent exploits phase transitions in metal oxides (e.g., from conductive to resistive states) to achieve e-fuse functionality, where controlled heating induces phase changes that permanently alter resistance, enabling reliable switching at low power consumption
3Length of moving object
If e-fuses are made at small sizes for scalability, then fabrication precision must be high, but this increases manufacturing complexity
Solution Approach 1:
The patent segments the e-fuse structure into distinct functional layers (metal layers, oxide layers, conductive elements) that can be formed using standard semiconductor fabrication processes, allowing small overall dimensions while maintaining manufacturing precision through modular construction
Solution Approach 2:
The patent designs e-fuse structures that can be integrated into existing semiconductor fabrication workflows using universal process steps (deposition, etching, patterning), enabling small sizes without requiring specialized high-precision equipment or processes
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 the fabrication of e-fuses at small sizes, suitable for RMG and FinFET devices, with minimal process modifications, and allows for reliable switching with lower voltage and current requirements, enhancing scalability and reliability while reducing defect densities.
Implementation Method 1
which can be converted from a conductive to a resistive state using localized joule heating with lower power
Data Source
AI summary
Methods, apparatus, and systems for fabricating and using a semiconductor device comprising a first conductive element; a second conductive element; and an e-fuse comprising a first region comprising a conductive oxide of a first metal; and a second region comprising a second metal, wherein an oxide of the second metal is resistive; wherein the e-fuse is electrically connected to both the first conductive element and the second conductive element.