Semiconductor Bonding Protection Layers Prevent Leakage
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Solution Overview
Problem
The scaling down of semiconductor devices poses challenges in achieving improved quality, yield, performance, and reliability due to issues such as metal to silicon leakage during the fabrication process.
Innovation Solution
A semiconductor device design that includes a conductive filler layer with protection layers formed of materials like aluminum oxide and zirconium oxide, which prevent metal diffusion and ensure the conductive filler layer is formed without voids, along with specific geometries and materials for the mask, isolation, and barrier layers to enhance bonding and reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the dimensions of semiconductor devices are scaled down to improve computing ability, then device performance is improved, but metal to silicon leakage occurs during fabrication
Solution Approach 1:
The patent introduces multiple protective layers (first protection layer, second protection layer) that segment the fabrication process into distinct protected zones. These layers are formed at different stages to prevent metal diffusion into silicon at different depths and locations, thereby resolving the leakage issue while maintaining scaled dimensions
Solution Approach 2:
The first protection layer is formed before the conductive filler layer is deposited, and the second protection layer is formed before etching the conductive filler layer. These preliminary protective measures prevent metal to silicon leakage during critical fabrication steps, allowing device scaling without compromising reliability
2Reliability
If protection layers are added to prevent metal to silicon leakage, then reliability is improved, but device complexity increases
Solution Approach 1:
The protection layers are applied locally only where metal to silicon leakage is likely to occur during the fabrication process, rather than uniformly across the entire device. This targeted approach provides necessary protection while minimizing the added complexity
Solution Approach 2:
The protection layers serve as intermediary barrier layers between the conductive filler layer and the silicon substrate. These intermediary layers prevent direct interaction between metal and silicon, resolving the leakage issue without requiring fundamental changes to the overall device structure
3Reliability
If conductive filler layer is formed to ensure electrical connection, then electrical conductivity is improved, but voids may form reducing manufacturing precision
Solution Approach 1:
The first protection layer is formed before depositing the conductive filler layer, creating a controlled interface that guides uniform metal deposition. This preliminary protective structure prevents void formation during the filling process while ensuring complete electrical connection
Solution Approach 2:
The patent controls the formation parameters of the protection layers and the subsequent conductive filler layer deposition to achieve uniform filling. By carefully managing deposition conditions and layer properties, complete filling without voids is achieved, ensuring both electrical conductivity and manufacturing precision
Data Source
AI summary
The present disclosure provides a method for fabricating a semiconductor device including performing a bonding process to bond a second die onto a first die, forming a first mask layer on the second die, forming a first opening along the first mask layer and the second die, and extending to the first die, forming isolation layers on sidewalls of the first opening, forming protection layers covering upper portions of the isolation layers, and forming a conductive filler layer in the first opening.