Selective Etching of Metal Oxide from Titanium Reactor Surfaces
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Solution Overview
Problem
Current methods for cleaning reaction chambers in thin film manufacturing, such as in situ etching and bead blasting, face challenges like reduced throughput, substrate contamination, environmental hazards, and inefficiency in removing hard contaminants like aluminum oxide, which affects the yield and reproducibility of the manufacturing process.
Innovation Solution
A method and composition for selectively etching metal oxides from metal surfaces using an alkaline etchant with an inhibitor like gallic acid and borate species, which effectively removes metal oxides like aluminum oxide from titanium surfaces without damaging the underlying material, allowing for controlled etching and reduced oxidation of titanium surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If in situ etching is used to clean reaction chambers, then cleaning effectiveness is improved, but substrate contamination and environmental hazards worsen
Solution Approach 1:
The patent uses a carefully formulated alkaline etching solution as an intermediary substance that selectively removes metal oxide contaminants from reactor surfaces. The solution contains specific additives that mediate between the etching action (removing contaminants) and protecting the substrate from damage or contamination, enabling effective cleaning without the harmful side effects of traditional methods
2Reliability
If bead blasting is used to remove hard contaminants, then contaminant removal capability is improved, but damage to reaction chamber components worsens
Solution Approach 1:
The patent replaces the mechanical abrasion system of bead blasting with a chemical etching system. Instead of using high-velocity abrasive particles to physically remove contaminants, the invention employs an alkaline chemical solution that selectively dissolves metal oxide contaminants through chemical reactions, thereby achieving contaminant removal without mechanical damage to the reactor components
3Productivity
If high etch rates are used in in situ etching, then cleaning efficiency is improved, but throughput is reduced
Solution Approach 1:
The patent optimizes multiple parameters of the etching process including solution concentration, temperature, additives, and exposure time to achieve the highest possible etch rate within acceptable time limits. By carefully adjusting these parameters, the invention maximizes cleaning efficiency while minimizing the time required, thereby reducing the impact on overall manufacturing throughput
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 efficient and selective removal of metal oxides, maintaining the integrity of the reactor components, improving process throughput, and reducing the risk of contamination, thereby enhancing the reproducibility and yield of thin film deposition processes.
Implementation Method 1
contacting a surface of a metal part with an alkaline etchant. A metal oxide is present on the surface of the metal part. The alkaline etchant is effective for etching the metal oxide
Implementation Method 2
the surface of the metal part is also contacted part with an inhibitor effective for inhibiting chemical attack of the metal part by the alkaline etchant
Data Source
AI summary
Compositions, methods, and systems permit selectively etching metal oxide from reactor metal parts (e.g., titanium and/or titanium alloys). The etching composition comprises an alkali metal hydroxide and gallic acid. The method is useful for cleaning reaction chambers used in the deposition of metal oxide films such as aluminum oxide.