E-fuse Metal Dummy Structure for Void Control
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Solution Overview
Problem
The unpredictable appearance and location of voids during the fusing of electrically programmable fuses (e-fuses) in semiconductor structures, particularly in back end of line (BEOL) processes, due to process changes and smaller scale device manufacturing, make it difficult to achieve controlled and reliable fusing.
Innovation Solution
Incorporating a metal dummy structure aligned with the electrical fuse link, which absorbs heat and creates a temperature difference to enhance electromigration and control void formation, allowing for predictable void location and fusing, and using this structure to monitor material leakage by applying a test voltage across the dummy structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If process changes and smaller scale device manufacturing are implemented, then productivity and device scaling are improved, but the appearance and location of voids during e-fuse fusing become unpredictable
Solution Approach 1:
The patent introduces a metal dummy structure with different thermal properties than the surrounding material, creating localized thermal characteristics in specific regions of the e-fuse. This local modification of thermal conductivity allows controlled heat dissipation patterns that guide void formation to predictable locations, resolving the unpredictability caused by process changes and scaling while maintaining improved productivity
2Manufacturing precision
If a metal dummy structure is added to control void formation, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The metal dummy structure serves multiple functions: it acts as a thermal management element to control heat dissipation during fusing, serves as a template to define void formation locations, and can potentially function as part of the interconnect structure. This multi-functionality allows precision control without proportionally increasing device complexity
Solution Approach 2:
The metal dummy structure acts as an intermediary element between the electrical fuse link and the surrounding substrate, mediating the thermal field distribution. This intermediary structure enables precise control of void formation without requiring direct modification of the fuse link geometry or manufacturing process
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 controlled and predictable fusing of e-fuses by localizing void formation and allows for effective monitoring of material leakage, improving reproducibility and reliability in semiconductor manufacturing.
Implementation Method 1
the metal dummy structure cools at least part of the electrical fuse link in response to an electric current passing through the electrical fuse link
Implementation Method 2
the metal dummy structure absorbs heat from the portion of the electrical fuse link substantially aligned with the metal dummy structure
Implementation Method 3
Applying a programming current (Iprog) to the e-fuse destroys a portion of the link... An e-fuse can be fused by causing electromigration to occur within the fuse link
Implementation Method 4
An e-fuse can be fused by causing electromigration to occur within the fuse link, creating a 'void' in all or part of the fuse link section
Data Source
AI summary
The present disclosure generally provides for an e-fuse structure and corresponding method for fusing the same and monitoring material leakage. The e-fuse structure can include a metal dummy structure and an electrical fuse link substantially aligned with a portion of the metal dummy structure, wherein the metal dummy structure cools at least part of the electrical fuse link in response to an electric current passing through the electrical fuse link.