Getter Surface Preparation Using Caustic Fluids
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The efficient integration of getter materials into the manufacturing process of Microelectromechanical Systems (MEMS) is challenging due to compatibility issues with subsequent manufacturing steps, chemical reactivity, and the need for complex and costly protection methods, which lead to ineffective gas sorption and increased manufacturing complexity.
Innovation Solution
Chemical treatments with caustic fluids, such as acidic or basic solutions, are used to enhance the properties and activation of getter materials without isolating them, allowing for improved gas sorption capabilities while maintaining structural integrity, and eliminating the need for temporary protective layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If getter materials are integrated into MEMS manufacturing process, then gas sorption capability is improved, but compatibility issues with subsequent manufacturing steps and chemical reactivity cause deterioration of manufacturing complexity and reliability
Solution Approach 1:
The getter material is deposited on the support substrate before subsequent manufacturing steps, and temporary protective layers are applied in advance to protect the getter from chemical attacks during bonding and other processes. This preliminary protection enables the getter to maintain its gas sorption capability while surviving the manufacturing process.
Solution Approach 2:
Temporary protective layers act as intermediary barriers between the getter material and harsh chemical environments during manufacturing. These protective layers prevent direct contact between caustic chemicals and the getter, allowing the getter to retain its structural integrity and gas sorption properties through subsequent processing steps.
2Reliability
If temporary protective layers are used to protect getter materials, then chemical reactivity damage is reduced, but manufacturing complexity and cost increase
Solution Approach 1:
Temporary protective layers are applied to protect the getter material during critical manufacturing steps, then deliberately removed or discarded after serving their protective function. This approach allows the getter to survive harsh processing conditions without requiring permanent protective structures, thereby reducing overall device complexity.
3Manufacturing precision
If getter materials are exposed to caustic chemicals during support treatment, then support cleaning is improved, but getter material structural integrity deteriorates
Solution Approach 1:
Temporary protective layers serve as intermediary barriers that prevent direct contact between caustic cleaning chemicals and the getter material. This allows the support substrate to be thoroughly cleaned while the getter material remains protected, maintaining both cleaning quality and getter integrity.
Solution Approach 2:
Different regions of the substrate are treated differently - the support substrate receives aggressive caustic cleaning to remove contaminants, while the getter material regions are protected by temporary layers. This localized differential treatment enables thorough cleaning without damaging the getter material.
4Reliability
If getter materials are protected during manufacturing, then gas sorption effectiveness is maintained, but manufacturing cost increases
Solution Approach 1:
Inexpensive temporary protective layers are applied to protect the getter material during manufacturing, then discarded after serving their protective purpose. These cheap, disposable protective layers prevent damage to the expensive getter material, reducing overall manufacturing costs while maintaining gas sorption 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 approach enhances the gas sorption capabilities of getter materials, reduces manufacturing complexity, and extends their effectiveness as process getters during high-temperature operations, resulting in more reliable and cost-effective MEMS production.
Implementation Method 1
treating the support having the deposit of the non-evaporable getter material with a caustic solution
Implementation Method 2
treating the getter material with a fluid to remove contaminants
Implementation Method 3
getter materials have been used to selectively sorb gasses
Implementation Method 4
getter materials are capable of reversibly sorbing hydrogen and substantially irreversibly sorbing gasses
Data Source
AI summary
A technique for manufacturing a device that includes a deposit of getter material on a support involves treating the support on which the getter material is formed with a caustic fluid. An aspect of the technique is that it may clean and/or chemically activate the getter material without substantial damage to the getter material. The getter material may be formed on an internal wall of the device.