Vacuum Plasma Nitridation for Clean Dielectric Passivation
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Solution Overview
Problem
Conventional semiconductor processing technologies face challenges in removing surface contamination and achieving high-quality passivation layers in high electron-mobility transistors (HEMTs), leading to reduced performance due to re-oxidation and contamination issues.
Innovation Solution
The technology involves a plasma-enhanced treatment process that removes surface contamination and nitrides the substrate surface within a vacuum environment, followed by the deposition of a dielectric passivation layer in a separate chamber, ensuring minimal re-oxidation and contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the substrate is exposed to atmosphere for cleaning and passivation deposition, then the process is simpler and faster, but surface re-oxidation and contamination occur leading to reduced device performance
Solution Approach 1:
The processing system is divided into multiple separate chambers (cleaning chamber, transfer chamber, deposition chamber) that operate independently under vacuum. This segmentation allows each process step to occur in a controlled vacuum environment without exposure to atmosphere, preventing re-oxidation while maintaining process efficiency through continuous vacuum operation across all chambers.
Solution Approach 2:
The patent maintains a vacuum environment (inert atmosphere) throughout the entire processing sequence from cleaning to passivation deposition. By eliminating atmospheric exposure during substrate transfer and processing, the system prevents oxygen and moisture contamination that would otherwise cause re-oxidation and performance degradation, while still enabling rapid processing through the integrated vacuum system.
2Ease of manufacture
If conventional cleaning methods are used, then the process is simpler, but surface contamination and oxygen defects remain leading to reduced HEMT performance
Solution Approach 1:
The patent replaces conventional mechanical or chemical cleaning methods with plasma-based cleaning. The plasma treatment effectively removes surface contamination, organic residues, and oxygen defects through chemical reactions and physical bombardment, achieving superior surface quality without complex multi-step conventional cleaning procedures. This substitution maintains process simplicity while dramatically improving surface cleanliness and device performance.
3Device complexity
If passivation deposition is performed after atmospheric exposure, then the process flow is simpler, but contamination and re-oxidation reduce the quality of the passivation layer
Solution Approach 1:
The system performs preliminary cleaning and surface preparation in vacuum before passivation deposition, and maintains vacuum throughout the transfer and deposition process. This preliminary action in a controlled environment ensures the substrate surface is free from contamination and re-oxidation before the passivation layer is deposited, guaranteeing high interface quality without requiring additional post-processing steps or complex atmospheric handling procedures.
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 effectively removes contaminants and nitrides the substrate surface, enabling uniform and contamination-free deposition of dielectric materials, which enhances the performance of HEMTs by reducing surface traps and ON resistance.
Implementation Method 1
forming plasma effluents of the nitrogen-containing precursor
Implementation Method 2
The contacting may nitride a surface of the substrate
Implementation Method 3
The layer of dielectric material may be deposited via chemical vapor deposition (CVD)
Implementation Method 4
The layer of dielectric material may be deposited via chemical vapor deposition (CVD), physical vapor deposition (PVD)
Implementation Method 5
The layer of dielectric material may be deposited via chemical vapor deposition (CVD), physical vapor deposition (PVD), or atomic layer deposition (ALD)
Data Source
AI summary
Exemplary semiconductor processing methods may include performing a treatment operation on a substrate housed within a first processing region of a first semiconductor processing chamber. The methods may include providing a nitrogen-containing precursor to the first processing region. The methods may include forming plasma effluents of the nitrogen-containing precursor. The methods may include contacting the substrate with the plasma effluents of the nitrogen-containing precursor. The contacting may nitride a surface of the substrate. The methods may include transferring the substrate from the first processing region of the first semiconductor processing chamber to a second processing region of a second semiconductor processing chamber. The methods may include providing one or more deposition precursors to the second processing region. The methods may include contacting the substrate with the one or more deposition precursors. The contacting may deposit a layer of dielectric material on the substrate.