Nitride Diffusion Barrier for Semiconductor Reliability
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving high reliability and improved storage capabilities in semiconductor devices due to issues with residual gases affecting device characteristics during fabrication processes.
Innovation Solution
The method involves forming a capping dielectric layer on a substrate, followed by a nitride process that supplies nitrogen to create a diffusion barrier layer, and then forming an etching stop layer and inter-layer dielectric layer, with thermal processing steps to minimize residual gas penetration and enhance device reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional fabrication process is used without additional barrier layers, then the manufacturing process is simpler and faster, but residual gases penetrate into semiconductor patterns causing reduced device reliability
Solution Approach 1:
A diffusion barrier layer is formed on the substrate before forming the capping dielectric layer and subsequent structures. This preliminary barrier layer prevents residual gases from penetrating into semiconductor patterns during later fabrication processes, thereby improving device reliability without significantly complicating the overall fabrication flow
Solution Approach 2:
The diffusion barrier layer acts as an intermediary between the substrate and the capping dielectric layer, blocking the penetration of residual gases while allowing the fabrication process to continue. This intermediary layer resolves the contradiction by providing protection against harmful gas penetration without requiring complete process redesign
2Reliability
If the capping dielectric layer is formed thick enough to prevent gas penetration, then device reliability improves, but the overall device dimensions and fabrication time increase
Solution Approach 1:
The protection against residual gas penetration is segmented into two separate functional layers: a diffusion barrier layer in contact with the substrate and a capping dielectric layer on top. This segmentation allows each layer to be optimized for its specific function, with the barrier layer being thin and highly effective at blocking gas diffusion, while the capping layer provides additional protection without needing to be excessively thick
Solution Approach 2:
The structure uses a composite of different materials with complementary properties: the diffusion barrier layer is made of a material with low gas permeability, while the capping dielectric layer provides mechanical protection and additional barrier properties. This composite approach achieves superior gas barrier performance with reduced overall thickness compared to using a single thick dielectric layer
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 reduces the penetration of process residual gases into semiconductor patterns, leading to semiconductor devices with improved reliability and performance.
Implementation Method 1
forming a diffusion barrier layer by a nitride process that includes supplying nitrogen to the capping dielectric layer
Implementation Method 2
thermally processing the substrate
Data Source
AI summary
Semiconductor devices and a methods of fabricating the semiconductor devices are provided. The semiconductor devices may include a pattern on a substrate. The semiconductor devices may also include a capping dielectric layer on the pattern. The semiconductor devices may further include a first nitride layer on the capping dielectric layer. Moreover, the semiconductor devices may include a second nitride layer on the first nitride layer. A concentration of nitrogen in the first nitride layer may be greater than that in the second nitride layer.