Plasma Treatment for Semiconductor Substrate Defect Repair
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Solution Overview
Problem
The existing methods for reducing crystal defects and metal contamination in semiconductor substrates, particularly those using HCN solutions, are not practical for production lines due to toxicity concerns and require the development of novel treatment apparatuses.
Innovation Solution
A plasma treatment method that generates CN active species from a mixed carbon and nitrogen gas to treat semiconductor substrates, effectively repairing crystal defects and removing metal contamination without using toxic HCN solutions, and can be integrated into existing semiconductor manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If HCN solution is used to treat semiconductor substrates, then crystal defects and metal contamination are greatly reduced, but the method becomes impractical due to high toxicity and requires novel treatment apparatuses
Solution Approach 1:
The patent changes the physical state of the treatment medium from liquid HCN solution to gaseous plasma, and changes the chemical form from molecular HCN to reactive CN radicals. This parameter change maintains the effectiveness of CN species in reducing defects and contamination while eliminating the toxicity issues associated with liquid HCN and enabling integration into existing production lines
Solution Approach 2:
The patent replaces the chemical solution-based treatment system with a plasma-based physical-chemical system. The plasma generator creates CN radicals through electrical discharge in a gas mixture, substituting the mechanical handling and chemical safety concerns of liquid HCN with a controllable plasma process that can be integrated into existing semiconductor manufacturing equipment
2Reliability
If HCN solution treatment is implemented, then device characteristics are improved, but new treatment apparatuses must be developed
Solution Approach 1:
The patent designs the plasma treatment system to be compatible with existing semiconductor manufacturing equipment, allowing the same apparatus to perform both standard plasma processing and the specialized CN radical treatment. This multi-functionality eliminates the need for separate novel apparatus while maintaining the reliability benefits of CN treatment
Solution Approach 2:
The patent uses a gas mixture (containing carbon and nitrogen sources) as an intermediary to generate CN radicals in plasma form. This intermediary approach allows the beneficial CN species to be delivered without requiring direct handling of toxic HCN, simplifying the apparatus requirements while maintaining treatment effectiveness
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 method effectively reduces crystal defects and metal contamination in semiconductor substrates, improving device characteristics without the need for new equipment, making it suitable for practical semiconductor production.
Implementation Method 1
creating a plasma from a mixed gas containing carbon and nitrogen to generate CN active species
Implementation Method 2
the CN− are allowed to selectively react with the metals and crystal defects (dangling bonds) present on the semiconductor substrate surface or in the substrate. The reaction forms a stable complex and removes the metals
Implementation Method 3
forms bonds with the dangling bonds to passivate the defects
Data Source
AI summary
A plasma treatment method includes: creating a plasma from a mixed gas containing carbon and nitrogen to generate CN active species, and treating a surface of a semiconductor substrate with the CN active species.