Segmented Pressure Control for Plasma Processing
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Solution Overview
Problem
Current plasma processing technologies face challenges in achieving uniformity during semiconductor wafer processing due to non-uniform gas flow and pressure distribution around the substrate, leading to chemical non-uniformities and inefficiencies in processes like etching and deposition.
Innovation Solution
A plasma processing apparatus with a pressure control ring system that divides the periphery of the substrate into multiple segments, allowing for independent control of exhaust pressure and gas flow, ensuring uniform gas distribution by cyclically varying the venting of plasma across the substrate through multiple concentric zones and segments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single exhaust pressure system is used for the entire periphery, then the device complexity is reduced, but the gas flow uniformity and chemical uniformity deteriorate
Solution Approach 1:
The exhaust pressure system is divided into multiple independent segments (at least three segments) around the substrate periphery. Each segment can independently control exhaust pressure, allowing differential gas flow management across different regions of the substrate to achieve uniform processing conditions.
Solution Approach 2:
Different segments of the exhaust pressure system are configured to provide locally optimized exhaust pressure control. This allows each region around the substrate to have tailored gas flow characteristics, ensuring uniform chemical distribution and residence time across the entire substrate surface.
2Manufacturing precision
If gas flow velocity varies around the substrate periphery, then the ease of operation is improved for different process conditions, but the chemical uniformity deteriorates
Solution Approach 1:
The exhaust pressure system enables dynamic control of gas flow velocity in different segments. By independently adjusting exhaust pressure in each segment, the system can optimize gas flow characteristics for various process conditions while maintaining uniform chemical distribution across the substrate.
Solution Approach 2:
The system changes exhaust pressure parameters independently in different segments to control gas flow velocity. This allows optimization of gas flow for specific process requirements while ensuring uniform chemical exposure across the substrate through coordinated parameter adjustment.
3Manufacturing precision
If the periphery is divided into multiple segments with independent exhaust pressure control, then the gas flow uniformity is improved, but the device complexity increases
Solution Approach 1:
The periphery is segmented into at least three independent zones with separate exhaust pressure control. This segmentation enables precise control of gas flow in different regions, achieving uniform processing across the substrate while managing complexity through modular zone control.
Solution Approach 2:
The segmented exhaust pressure system serves multiple functions: it controls gas flow uniformity, adjusts residence time distribution, and optimizes chemical distribution across the substrate. This multi-functionality justifies the increased complexity by delivering comprehensive processing uniformity.
Data Source
AI summary
An apparatus for processing a substrate is provided. A processing chamber is provided. A substrate support for supporting the substrate is within the processing chamber. A gas inlet provides gas into the processing chamber. An exhaust pressure system exhausts gas around a periphery of the substrate, wherein the periphery around the substrate is divided into at least three parts, wherein the exhaust pressure system controls exhaust pressure to control a velocity of the gas over the substrate, wherein the exhaust pressure system provides at independent exhaust pressure control for each part of the periphery for the at least three parts.