Multilayer Seed Structure for Defect-Resistant Semiconductor Electrodes
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Solution Overview
Problem
Defects in the seed layer of semiconductor devices can lead to defects in the electrode layer, affecting the electrical characteristics of highly integrated semiconductor devices.
Innovation Solution
A seed structure is implemented, comprising multiple barrier and seed layers, with each layer contacting specific surfaces of the previous layers, and an electrode layer is formed using an electroplating process, ensuring direct connection and improved electrical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single barrier layer and single seed layer are used, then the device complexity is reduced, but the electrical characteristics and reliability deteriorate due to defects
Solution Approach 1:
The seed structure is divided into multiple discrete layers: a first barrier layer, a first seed layer, a second barrier layer, and a second seed layer. Each layer serves a specific function - the barrier layers prevent diffusion and oxidation, while the seed layers provide nucleation sites for electrode formation. This segmentation allows each layer to be optimized independently, improving overall reliability without requiring complete redesign of the entire structure.
Solution Approach 2:
The invention employs a composite multi-layer structure combining different materials with complementary properties. The barrier layers (e.g., tungsten, molybdenum, titanium nitride) provide diffusion blocking and oxidation resistance, while the seed layers (e.g., copper, aluminum, gold) provide excellent electrical conductivity and electroplating nucleation. This composite approach leverages the strengths of each material to achieve superior electrical characteristics that cannot be obtained with a single material system.
2Reliability
If multiple barrier and seed layers are implemented, then the electrical characteristics improve, but the manufacturing process complexity increases
Solution Approach 1:
The multi-layer barrier and seed structure is formed as a pre-configured foundation before the electrode layer is deposited. The barrier layers are formed first to establish diffusion and oxidation protection, followed by the seed layers that are specifically prepared to provide optimal nucleation sites. This preliminary action ensures that when the electrode layer is subsequently formed via electroplating, the process proceeds uniformly and reliably without requiring complex in-process adjustments.
Solution Approach 2:
The barrier layers serve as intermediary structures between the substrate and the seed layers, and between the seed layers and the electrode layer. They mediate the interaction between different materials by providing controlled interfaces that prevent unwanted diffusion and oxidation while maintaining electrical connectivity. This intermediary function simplifies the overall manufacturing process by creating well-defined transition zones that facilitate subsequent processing steps.
3Reliability
If the second barrier layer contacts the side surface of the first barrier layer and first seed layer, then the coverage and protection are improved, but the manufacturing precision requirements increase
Solution Approach 1:
The second barrier layer is configured to contact the side surface of the first barrier layer and first seed layer, creating a nested arrangement where layers are positioned in overlapping configurations. This nesting provides enhanced coverage and protection by ensuring that interfaces between layers are fully covered, preventing diffusion and oxidation pathways. The nested structure naturally accommodates typical manufacturing tolerances while maintaining effective barrier coverage.
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 seed structure enhances the electrical characteristics of semiconductor devices by providing a stable and reliable foundation for the electrode layer, reducing defects and improving overall device performance.
Implementation Method 1
An electrode layer may be disposed on the seed structure
Data Source
AI summary
A semiconductor device may include a seed structure on a complex structure. The seed structure may include a first barrier layer, a first seed layer on the first barrier layer, a second barrier layer on the first seed layer, and a second seed layer on the second barrier layer. The second barrier layer may contact a side surface of at least one of the first barrier layer and the first seed layer. An electrode layer may be disposed on the seed structure.