Adjustable Control Ring for Precise Wafer-Edge Plasma Distribution
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Solution Overview
Problem
The challenge in semiconductor manufacturing lies in accurately controlling the plasma distribution area during plasma processes, particularly at the edge of a semiconductor wafer, which significantly impacts product quality and yield due to ongoing miniaturization and complexity.
Innovation Solution
An apparatus with a control assembly comprising a plurality of blades forming a control ring around the substrate, allowing real-time adjustment of the plasma distribution area through a rotatable structure that changes the inner diameter of the control ring, ensuring precise and symmetric plasma distribution across the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a fixed control ring structure is used, then the device complexity is reduced, but the manufacturing precision of plasma distribution area cannot be controlled
Solution Approach 1:
The control ring is segmented into multiple adjustable blades that can be independently positioned. Each blade can be moved radially to adjust the inner diameter of the control ring, allowing precise control of the plasma distribution area while maintaining a modular structure that balances complexity with functionality.
Solution Approach 2:
The control ring transitions from a fixed structure to a dynamic adjustable structure. The blades can be moved along radial directions during substrate processing, enabling real-time adjustment of the plasma distribution area to match different substrate sizes and processing requirements.
2Adaptability or versatility
If the control ring inner diameter is adjusted during operation, then the adaptability to different substrate sizes is improved, but the device complexity increases
Solution Approach 1:
The control assembly with adjustable blades serves multiple functions: it controls the plasma distribution area, adapts to different substrate sizes, and maintains process stability. This multi-functional design eliminates the need for separate control mechanisms for different substrate types, achieving versatility without proportionally increasing complexity.
Solution Approach 2:
The blades are pre-positioned in specific radial locations corresponding to different substrate sizes before processing begins. This preliminary configuration allows quick switching between different plasma distribution areas without requiring complex real-time adjustment mechanisms during the actual processing operation.
3Manufacturing precision
If precise control of plasma distribution area is implemented, then the manufacturing precision is improved, but the ease of operation decreases
Solution Approach 1:
The control system incorporates feedback mechanisms that monitor the actual plasma distribution and automatically adjust blade positions to achieve the desired plasma uniformity. This closed-loop control reduces the operational burden on users while maintaining high manufacturing precision through automated adjustments based on real-time process data.
Data Source
AI summary
An apparatus of processing a substrate, the apparatus including: a substrate supporting unit configured to support the substrate; a control assembly disposed along an outer edge of the substrate supporting unit, the control assembly including a plurality of blades, wherein the plurality of blades are configured to combine and form a control ring that surrounds the outer edge of the substrate supporting unit; and a plasma generating unit disposed to face the substrate supporting unit, wherein the control ring has an inner diameter that is changeable during an operation of the plasma generating unit.