Substrate Edge Oxidation Profile for Selective Annular Metal Removal
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Solution Overview
Problem
Conventional semiconductor fabrication methods face challenges in removing unwanted metallic byproducts from the annular edge region of substrates, leading to electrical issues and device failures, as existing oxidation techniques risk damaging the substrate interior.
Innovation Solution
A method involving the simultaneous flow of an oxidizing gas around the periphery and an inert gas through the showerhead creates a high oxygen concentration annular gas region for selective oxidation of the substrate's edge, while maintaining a low oxygen concentration interior, preventing over-oxidization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidation techniques are applied to remove metallic byproducts from the annular edge region, then the unwanted metals are oxidized, but the substrate interior may be damaged due to over-oxidization
Solution Approach 1:
The patent applies local quality by creating distinct gas regions with different oxygen concentrations at different locations on the substrate. An annular gas region with high oxygen concentration is formed around the periphery for selective oxidation of metallic byproducts, while an interior gas region with low oxygen concentration protects the substrate interior from over-oxidization. This spatial differentiation of gas composition enables localized chemical treatment.
Solution Approach 2:
The oxidation process is segmented into two separate zones: an annular edge region subjected to high oxygen concentration for metal oxidation, and an interior region subjected to low oxygen concentration for protection. The gas delivery system is segmented to provide different gas compositions to different regions simultaneously, preventing the trade-off between effective metal removal and substrate protection.
2Manufacturing precision
If high oxygen concentration is applied to oxidize metals in the annular edge region, then oxidation effectiveness is improved, but the substrate interior becomes vulnerable to over-oxidization
Solution Approach 1:
Different oxygen concentrations are applied locally to different regions of the substrate based on their specific requirements. The annular edge region receives high oxygen concentration for effective metal oxidation, while the interior region receives low oxygen concentration to maintain structural integrity. This localized quality control achieves precise manufacturing outcomes without compromising substrate reliability.
Solution Approach 2:
The patent uses an intermediary inert gas (such as nitrogen or argon) to deliver the low oxygen concentration environment to the substrate interior. This intermediary gas acts as a barrier that prevents oxygen from reaching the interior region in high concentrations, thereby protecting the substrate while allowing the annular region to undergo effective oxidation.
3Object-affected harmful factors
If oxidizing gas is flowed only through the showerhead, then the substrate interior is protected, but the annular edge region does not receive sufficient oxygen for effective oxidation
Solution Approach 1:
The gas delivery system is segmented into two independent pathways: one delivering oxidizing gas to the annular edge region through periphery flow paths, and another delivering inert gas through the showerhead to protect the interior. This segmentation enables each region to receive the appropriate gas composition for its specific processing requirements.
Solution Approach 2:
The patent introduces a spatial dimension to gas delivery by establishing vertical and radial gas flow gradients. Oxidizing gas is delivered horizontally around the periphery at the substrate edge, while inert gas flows vertically through the showerhead onto the interior. This multi-dimensional gas distribution creates the desired oxygen concentration gradient across the substrate surface.
4Device complexity
If sequential gas flowing is used, then gas delivery is simplified, but processing time increases and productivity decreases
Solution Approach 1:
The patent implements continuous simultaneous gas flowing of both oxidizing and inert gases during the same time period. This continuous parallel action eliminates the need for sequential processing steps, thereby reducing total processing time and increasing substrate throughput without requiring complex multi-step gas delivery sequences.
Solution Approach 2:
The patent merges the oxidation process and the protection process into a single simultaneous operation. Both the annular region oxidation and the interior region protection occur concurrently through combined gas delivery, rather than requiring separate sequential steps. This merging of operations maintains relative system simplicity while dramatically improving processing efficiency.
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 oxidizes unwanted metals in the annular edge region without damaging the substrate interior, enhancing the precision and reliability of semiconductor fabrication by preventing short circuits and maintaining the integrity of etched features.
Implementation Method 1
simultaneously flowing, while the substrate is supported by the substrate holder, (a) an oxidizing gas around a periphery of the substrate
Implementation Method 2
flowing an inert gas that does not include oxygen through the showerhead and onto the substrate
Implementation Method 3
heating, during the simultaneous flowing, the substrate to a first temperature
Implementation Method 4
evacuating, during the simultaneous flowing of the oxidizing gas and the inert gas, gases from the processing chamber
Data Source
AI summary
Methods and apparatuses are provided herein for oxidizing an annular edge region of a substrate. A method for oxidizing an annular edge region of a substrate may include simultaneously flowing, while the substrate is supported by a substrate holder, an oxidizing gas around a periphery of the substrate and an inert gas through a showerhead and onto the substrate, thereby creating an annular gas region over an annular edge region of the substrate and an interior gas region over on an interior region of the substrate and the annular gas region has an oxidization rate higher than the interior gas region.