Aluminum Ion Beam Generation via Ceramic Etching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ion implantation systems face challenges in efficiently generating aluminum ion beams due to the deposition of insulating materials like aluminum oxide and aluminum nitride on electrodes, leading to high voltage instabilities, reduced beam currents, and frequent maintenance needs, especially when using fluorine-based etchants which can also introduce contaminants.
Innovation Solution
An ion implantation system utilizing an aluminum-based solid source material with a pre-mixed etchant gas mixture of fluorine and a noble gas, such as helium, to minimize deposits on electrodes and increase beam stability, where the fluorine concentration is limited to a health safety level to prevent safety issues and maintain high beam currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If fluorine-based etchant is used to etch aluminum-based material, then aluminum ion beam current is achieved, but insulating material deposits on electrodes causing high voltage instability
Solution Approach 1:
A ceramic member (intermediary component) is introduced between the etchant gas and the electrodes to prevent direct contact and deposition. The ceramic member is etched by the fluorine-based etchant to release aluminum ions, while its ceramic structure prevents insulating material from depositing on the electrodes, thus maintaining high voltage stability while achieving beam current.
2Productivity
If metal-containing material is placed inside arc chamber, then ion beam is generated, but time is required for heating and species change
Solution Approach 1:
The invention changes the physical state and chemical form of the aluminum source from bulk metal requiring heating to a ceramic material that can be etched at lower temperatures. By using a ceramic member containing aluminum that reacts with fluorine-based etchant, the system achieves rapid ion beam generation without extensive heating cycles, reducing the time loss for species changes.
3Power
If aluminum oxide or aluminum nitride is used as source material, then beam current is attained, but frequent maintenance is required due to electrode deposition
Solution Approach 1:
The ceramic member serves as an intermediary sacrificial component that is deliberately designed to be etched and consumed over time, protecting the electrodes from direct exposure to the etchant and preventing insulating material deposition on them. This extends electrode lifetime while maintaining beam current through controlled etching of the ceramic member.
4Quantity of substance
If external vaporizer is used to supply metal vapor, then adequate vapor pressure is achieved, but system complexity and startup time increase
Solution Approach 1:
The invention extracts and eliminates the external vaporizer component from the system. Instead of using a separate heating device to generate metal vapor, the system uses a ceramic member that directly releases aluminum ions through chemical etching by fluorine-based gas, simplifying the system structure while maintaining adequate aluminum supply for ion beam generation.
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
The system reduces arcing and maintenance requirements, increases ion source and electrode lifetimes, and achieves stable aluminum ion beam currents by minimizing deposits and secondary collisions, while ensuring operational safety with controlled fluorine concentrations.
Implementation Method 1
an ion source configured to ionize an aluminum-based ion source material and form an ion beam therefrom
Implementation Method 2
The aluminum-based ion source material is etched with the fluorine to produce aluminum ions
Implementation Method 3
A vacuum system can be configured to substantially evacuate the ion source
Data Source
AI summary
An ion implantation system, ion source, and method are provided, where an ion source is configured to ionize an aluminum-based ion source material and to form an ion beam and a by-product including a non-conducting material. An etchant gas mixture has a predetermined concentration of fluorine and a noble gas that is in fluid communication with the ion source. The predetermined concentration of fluorine is associated with a predetermined health safety level, such as approximately a 20% maximum concentration of fluorine. The etchant gas mixture can have a co-gas with a concentration less than approximately 5% of argon. The aluminum-based ion source material can be a ceramic member, such as a repeller shaft, a shield, or other member within the ion source.