Semiconductor Bonding via Reducing Gas and Inert Chamber Segmentation
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Solution Overview
Problem
In semiconductor packaging, traditional bonding processes face challenges with oxidation and contamination of copper structures during flip chip or thermocompression bonding, which can affect the reliability of interconnections between semiconductor elements and substrates.
Innovation Solution
A bonding system and method that utilize a substrate oxide reduction chamber to apply a reducing gas to the substrate's conductive structures, followed by an inert environment in a substrate oxide prevention chamber, ensuring a fluxless bonding process that prevents oxidation and contamination during the bonding of semiconductor elements to substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reducing gas is used to prevent oxidation of copper structures during bonding, then the reliability of interconnections is improved, but the complexity of the bonding system increases due to additional gas delivery mechanisms and chamber requirements
Solution Approach 1:
The bonding system is divided into distinct functional chambers: a reducing gas delivery chamber for oxide removal and a separate bonding chamber for the actual bonding process. This segmentation allows each chamber to be optimized for its specific function while managing overall system complexity through modular design.
Solution Approach 2:
The reducing gas is applied to the copper structures before the bonding process to remove surface oxides and contaminants. This preliminary action ensures that the bonding surfaces are clean and ready for reliable interconnection, preventing oxidation issues during the subsequent bonding step.
2Ease of manufacture
If traditional flux-based methods are used to prevent oxidation during bonding, then the process is simpler to implement, but contamination and environmental harm increase
Solution Approach 1:
The bonding process is conducted in an inert atmosphere using nitrogen or other inert gases to prevent oxidation of copper structures. This eliminates the need for flux materials and their associated environmental contaminants, providing a clean and environmentally friendly bonding process.
Solution Approach 2:
The chemical flux-based oxidation prevention method is replaced with a physical inert gas atmosphere approach. This substitution eliminates harmful chemical contaminants while maintaining effective oxidation protection during the bonding process.
3Reliability
If nitrogen gas is used extensively to maintain inert environment during bonding, then oxidation prevention is improved, but gas consumption and cost increase
Solution Approach 1:
The system separates the reducing gas treatment chamber from the bonding chamber, allowing precise control of inert gas usage. The reducing gas is applied locally where needed for oxide removal, and the inert atmosphere is maintained only in the bonding chamber, minimizing overall nitrogen consumption.
Solution Approach 2:
The inert atmosphere and reducing gas are applied locally to specific areas requiring protection rather than filling the entire system. This localized approach maintains oxidation prevention effectiveness while significantly reducing the total volume of nitrogen gas required.
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 reliable, fluxless bonding by reducing metal oxides on both semiconductor elements and substrates, maintaining a clean environment and preventing oxide formation during heat exposure, while minimizing nitrogen gas consumption.
Implementation Method 1
The substrate oxide reduction chamber is configured to receive a reducing gas to contact each of the plurality of first electrically conductive structures
Implementation Method 2
The substrate oxide prevention chamber has an inert environment when receiving the substrate
Data Source
AI summary
A bonding system for bonding a semiconductor element to a substrate is provided. The bonding system includes a substrate oxide reduction chamber configured to receive a substrate. The substrate includes a plurality of first electrically conductive structures. The substrate oxide reduction chamber is configured to receive a reducing gas to contact each of the plurality of first electrically conductive structures. The bonding system also includes a substrate oxide prevention chamber for receiving the substrate after the reducing gas contacts the plurality of first electrically conductive structures. The substrate oxide prevention chamber has an inert environment when receiving the substrate. The bonding system also includes a reducing gas delivery system for providing a reducing gas environment during bonding of a semiconductor element to the substrate.