Ion Beam Neutral Particle Separation in Implantation
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Solution Overview
Problem
In ion implantation systems, neutral particles are deposited on substrates alongside desired ions, causing uncontrollable dopant/depth profile alterations and outgassing issues, and are not easily detected or separated using traditional methods.
Innovation Solution
The system separates ions from neutral particles by manipulating electrical or magnetic fields within the implantation system, or using gas flows to divert neutral particles, allowing only ions to reach the substrate without the need for expensive mass analyzers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional dosimetry techniques are used to monitor particle delivery, then the ion implantation process can be controlled, but neutral particle deposition cannot be detected or controlled
Solution Approach 1:
The patent extracts and separates the neutral particle flow from the ion beam path using physical barriers and flow manipulation techniques. By creating a separate neutral particle extraction path, the system can monitor and control neutral particles independently from the ion implantation process, enabling detection without adding complex dosimetry equipment to the main beam line.
Solution Approach 2:
The patent introduces an intermediary gas flow (such as nitrogen or helium) that carries neutral particles away from the substrate. This intermediary medium allows indirect monitoring of neutral particle flux by measuring properties of the gas flow, providing detection capability without direct neutral particle sensors in the beam path.
2Productivity
If neutral particles are allowed to reach the substrate, then the ion implantation process is simpler, but the dopant/depth profile is altered and outgassing occurs
Solution Approach 1:
The patent segments the particle beam into separate ion and neutral components using physical barriers and flow manipulation. By dividing the original beam path into distinct ion delivery and neutral particle extraction paths, the system maintains high ion implantation efficiency while preventing neutral particles from reaching the substrate, thus preserving dopant/depth profile control.
Solution Approach 2:
The patent converts the harmful effect of neutral particle contamination into a beneficial separation mechanism. By allowing neutral particles to follow a different flow path driven by pressure gradients and gas flows, the system uses the natural tendency of neutral particles to drift with the gas flow as the separation mechanism, turning what was previously a contamination problem into an effective separation method.
3Object-affected harmful factors
If mass analyzers are used to separate ions from neutral particles, then separation is achieved, but equipment cost increases significantly
Solution Approach 1:
The patent replaces expensive, complex mass analyzers with simple, inexpensive components such as physical barriers, flow manipulation elements, and basic sensors. These simple components achieve effective neutral particle removal without the high cost and complexity of mass spectral analysis equipment, making the solution economically viable for industrial implementation.
Solution Approach 2:
The patent substitutes complex electromagnetic separation systems (mass analyzers) with simpler mechanical and fluid dynamic approaches. By using pressure gradients, gas flows, and physical barriers to separate neutral particles from ions, the system achieves effective separation using basic mechanical principles rather than expensive electromagnetic analysis equipment.
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 reduces neutral particle deposition on substrates, improving control over the ion implantation process and preventing dopant outgassing, while maintaining cost-effectiveness.
Implementation Method 1
a first electrode and a second opposed electrode, each in electrical communication with a power supply to apply a potential to each electrode, disposed in the process chamber so as to attract ions from the ion source through the aperture and toward a substrate
Implementation Method 2
The separation of neutral particles from ions can be achieved by manipulating the flow of ions in the system through variations in electrical or magnetic fields disposed within the implantation system
Implementation Method 3
a gas flow is introduced into the process chamber to push neutral particles that exit the aperture away from the center line
Data Source
AI summary
Ion implantation systems that separate the flow of ions from the flow of neutral particles are disclosed. The separation of neutral particles from ions can be achieved by manipulating the flow of ions in the system through variations in electrical or magnetic fields disposed within the implantation system. The path of neutral particles is less affected by electrical and magnetic fields than ions. The separation of these flows may also be accomplished by diverting the neutral particles from the ion beam, such as via an introduced gas flow or a flow blockage. Both separation techniques can be combined in some embodiments.