Assisting Layer Structure for Diffusion-Resistant Semiconductor Interconnects
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Solution Overview
Problem
The scaling down of semiconductor devices poses challenges in achieving improved quality, yield, performance, and reliability while reducing complexity, particularly due to issues like metal ion diffusion and electron migration.
Innovation Solution
A semiconductor device design featuring a substrate with a U-shaped insulating layer, an assisting layer made of manganese, and a conductive structure with titanium silicon nitride, which prevents metal ion diffusion and reduces electron migration by forming a stable barrier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dimensions of semiconductor devices are scaled down to meet increasing computing demand, then computing ability is improved, but metal ion diffusion and electron migration issues increase
Solution Approach 1:
The patent introduces an assisting layer made of manganese as an intermediary barrier between the substrate and the insulating layer. This assisting layer specifically prevents metal ion diffusion and reduces electron migration, thereby resolving the reliability issues that arise when scaling down semiconductor devices while maintaining improved computing ability
Solution Approach 2:
The patent employs a composite structure consisting of multiple layers including the manganese assisting layer, insulating layers, and conductive structures with titanium silicon nitride. This composite material approach creates a stable barrier system that addresses metal ion diffusion and electron migration problems while enabling continued device scaling for improved computing performance
2Length of moving object
If the dimensions of semiconductor devices are scaled down, then device size is reduced, but quality and yield deteriorate due to increased manufacturing issues
Solution Approach 1:
The manganese assisting layer serves as a mediator that stabilizes the interface between layers, preventing defects and ensuring consistent material properties. This intermediary layer helps maintain manufacturing precision and yield even as device dimensions are reduced
Solution Approach 2:
The patent modifies the material composition and structural parameters by introducing the manganese assisting layer and titanium silicon nitride conductive structures. These parameter changes create a more stable fabrication process that maintains quality and yield during device scaling
3Productivity
If the dimensions of semiconductor devices are scaled down, then integration density is improved, but complexity increases due to additional process requirements
Solution Approach 1:
The manganese assisting layer performs multiple functions simultaneously: it prevents metal ion diffusion, reduces electron migration, and provides a stable foundation for subsequent layer formation. This multi-functionality reduces the need for additional specialized process steps, thereby limiting the increase in complexity while maintaining high integration density
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 design enhances the performance and reliability of semiconductor devices by reducing electron migration and maintaining excellent barrier properties under heat, thereby improving overall device characteristics.
Implementation Method 1
the first assisting layer formed of manganese may prevent metal ion diffusion to the substrate
Implementation Method 2
the first assisting layer formed of manganese may prevent metal ion diffusion to the substrate. As a result, the electron migration of the resulting semiconductor device may be reduced
Data Source
AI summary
A semiconductor device includes a first insulating layer inwardly positioned in a substrate and including a U-shaped cross-sectional profile; a first assisting layer conformally positioned on the first insulating layer and the substrate; a first filler layer positioned on the first assisting layer; and a capping dielectric layer positioned on the substrate and covering the first assisting layer and the first filler layer. A top surface of the first insulating layer is at a vertical level lower than a top surface of the substrate. The first assisting layer includes a first step portion and a second step portion, the first step portion of the first assisting layer is adjacent to the top surface of the first insulating layer, and the second step portion of the first assisting layer is adjacent to the top surface of the substrate.