Bonding System Oxide Reduction for Cleaner Semiconductor Interconnects
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Solution Overview
Problem
Conventional semiconductor packaging methods, such as flip chip and thermocompression bonding, face challenges in maintaining a reducing environment to prevent oxidation and contamination of conductive structures, which can affect the bonding process.
Innovation Solution
An oxide reduction delivery system is integrated with a bonding system, allowing for the controlled movement of a reducing gas, such as formic acid vapor or plasma gas, to contact the substrate, effectively reducing oxides on conductive structures during the bonding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a reducing gas environment is used to prevent oxidation of conductive structures, then the bonding quality is improved, but the system complexity increases due to the need for gas delivery systems
Solution Approach 1:
The patent combines the reducing gas delivery system with the substrate support structure by integrating the gas delivery nozzle directly onto the support structure that holds the substrate. This merging of functions allows the same structure to both support the substrate and deliver the reducing gas, thereby improving bonding quality while minimizing the increase in system complexity.
Solution Approach 2:
The patent introduces a reducing gas (such as formic acid vapor or plasma gas) as an intermediary substance that mediates between the environment and the conductive structures. This gas acts as a protective intermediary that prevents oxidation and contamination during the bonding process, improving bonding quality without requiring direct contact or complex mechanical modifications to the bonding apparatus.
2Reliability
If conventional techniques like plasma gas delivery systems are used to provide a reducing environment, then oxidation is prevented, but the processing time and energy consumption increase
Solution Approach 1:
The patent applies preliminary action by delivering the reducing gas to the substrate surface before the bonding process begins and maintaining it during bonding. The gas is introduced in advance to pre-establish the protective reducing environment, preventing oxidation from occurring in the first place rather than requiring post-processing or extended processing times to achieve the same protective effect.
Solution Approach 2:
The patent employs periodic action by controlling the reducing gas delivery in a cyclic manner - introducing the gas before bonding, maintaining it during bonding, and removing or reducing it after bonding. This periodic delivery pattern ensures continuous protection during the critical bonding phase while minimizing gas exposure time and energy consumption during non-bonding phases.
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 enhances the bonding process by creating a suitable environment that reduces oxidation and contamination, improving the quality of interconnections between semiconductor elements and substrates.
Implementation Method 1
a gas provided by the oxide reduction delivery system contacts the substrate... reducing oxides on conductive structures
Implementation Method 2
the oxide reduction delivery system is a formic acid vapor delivery system
Implementation Method 3
the oxide reduction delivery system is a plasma gas delivery system
Data Source
AI summary
A method of processing a substrate on a bonding system is provided. The method includes: (a) providing an oxide reduction delivery system on a bonding system; (b) supporting a substrate on a support structure of the bonding system; and (c) moving at least one of the oxide reduction delivery system and the support structure with respect to one another, such that a gas provided by the oxide reduction delivery system contacts the substrate.