Neutralized Ion Beam Reflector Layout for Perpendicular Substrate Incidence
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Solution Overview
Problem
Plasma processing apparatus face challenges in maintaining uniformity of ion incidence due to the inclination of the plasma source and substrate, leading to issues like amorphous layer transformation, chemical composition changes, and charge-up damage, particularly in high-integration semiconductor devices.
Innovation Solution
A substrate processing apparatus using a neutralized beam, where ions collide with reflectors multiple times in symmetrical directions to restore the original ion source direction perpendicular to the substrate, ensuring uniform ion incidence and minimizing angle errors during manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ions are directed to the substrate using an inclined neutralizer plate, then ion neutralization is achieved, but the angle between the plasma source and substrate becomes inclined, making it difficult to maintain perpendicularity during manufacturing and management
Solution Approach 1:
The single inclined neutralizer plate is segmented into multiple reflectors (first reflector and second reflector) arranged in sequence. The ion beam undergoes multiple reflections with each reflector, allowing the neutralization function to be distributed across multiple components rather than relying on a single inclined plate. This segmentation enables each reflector to be positioned at smaller, more manageable angles while achieving the same overall neutralization effect.
Solution Approach 2:
Multiple reflectors are introduced as intermediary components between the ion source and substrate. These reflectors serve as intermediate stages that progressively neutralize the ion beam through sequential collisions, rather than requiring direct interaction with a single inclined plate. The intermediary reflectors allow the system to maintain perpendicular alignment while achieving neutralization through multiple smaller-angle collisions.
2Reliability
If the plasma source is inclined to achieve ion neutralization, then ion collision neutralization is enabled, but the path of ions is altered depending on incidence positions, leading to reduced incidence uniformity
Solution Approach 1:
The neutralization process is segmented into multiple discrete reflection stages, with each reflector handling a portion of the neutralization task. This segmentation ensures that ions undergo consistent neutralization regardless of their specific incidence position, as each reflector provides a controlled interaction point. The multiple smaller-angle reflections reduce the variation in ion paths compared to a single large-angle inclination.
Solution Approach 2:
The system uses multiple reflectors with different orientations and positions rather than a single symmetric inclined plate. Each reflector is positioned and angled specifically to contribute to the overall neutralization while maintaining beam uniformity. This asymmetric arrangement of multiple components provides better control over ion paths and reduces sensitivity to incidence position variations.
3Manufacturing precision
If multiple reflectors are used to neutralize ions through multiple collisions, then ion incidence uniformity is improved and perpendicularity is maintained, but the device complexity increases
Solution Approach 1:
Each reflector in the sequence serves multiple functions: it acts as a neutralization surface for incident ions, serves as a positional reference for beam alignment, and contributes to the overall angular correction. This multi-functionality reduces the need for additional separate components, offsetting the complexity increase from using multiple reflectors rather than a single plate.
Solution Approach 2:
The system transitions from a single two-dimensional inclined plate to a multi-dimensional arrangement of multiple reflectors positioned at different locations and angles. This dimensional expansion allows the neutralization function to be distributed in space, improving uniformity while the modular nature of the arrangement keeps the system manageable through standardized component positioning.
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 ion incidence uniformity and reduces the risk of substrate damage by maintaining the ion source and substrate perpendicularity, improving processing precision and reducing unwanted sputtering.
Implementation Method 1
ions collide with reflectors multiple times in symmetrical directions to restore the original ion source direction perpendicular to the substrate
Implementation Method 2
ions collide with reflectors multiple times in symmetrical directions
Data Source
AI summary
In a substrate processing apparatus using a neutralized beam and a method thereof, the substrate processing apparatus includes: an ion source for emitting an ion beam at an emitting angle; reflectors at which the ion beam emitted by the ion source is incident and subject to 2n collisions (where n is a positive integer) in first and second opposite directions to neutralize the ion beam as a neutralized beam and to restore a direction of propagation of the neutralized beam to the emitting angle of the ion beam; and a substrate at which the neutralized beam generated by the reflectors is incident on to perform a process. Accordingly, an incident angle of the resultant neutralized beam is perpendicular to a substrate, while the direction of propagation of the originating ion source and the surface of the substrate are maintained to be perpendicular to each other.