Shared Exhaust Layout for Multi-Chamber Pressure and Particle Control
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Solution Overview
Problem
Batch processing of wafers in multiple reaction chambers sharing a common exhaust system leads to cross-talk and particle contamination due to pressure differences, compromising precision and throughput.
Innovation Solution
A substrate processing apparatus with a shared exhaust unit, including a shared valve and vacuum pump, and dilution gas lines to control the flow rate of dilution gas, ensuring continuous gas exhaustion and maintaining the shared valve open, while also using seal gas lines to prevent plasma introduction and reduce particle contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple reaction chambers share a common exhaust system, then throughput is improved, but cross-talk and particle contamination occur due to pressure differences
Solution Approach 1:
A common exhaust line acts as an intermediary connecting multiple reaction chambers, allowing them to share exhaust infrastructure while maintaining independent pressure control through individual throttle valves, thus enabling high throughput without cross-contamination
Solution Approach 2:
The system dynamically adjusts exhaust parameters by using individual throttle valves for each reaction chamber connected to the common exhaust line, allowing independent pressure control that prevents cross-talk and particle contamination while maintaining high throughput
2Device complexity
If multiple reaction chambers share a common exhaust system, then device complexity is reduced, but pressure control precision deteriorates
Solution Approach 1:
Multiple exhaust lines are merged into a single common exhaust line that connects to one vacuum pump, reducing device complexity while individual throttle valves on each branch maintain precise independent pressure control for each reaction chamber
Solution Approach 2:
The common exhaust line serves multiple reaction chambers simultaneously, providing a universal exhaust infrastructure that reduces complexity while individual throttle valves enable each chamber to maintain its own precise pressure control
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 configuration enhances throughput by maintaining precise control over each reaction chamber's environment, reducing particle contamination and ensuring continuous gas exhaustion, thereby improving the overall processing efficiency and precision.
Implementation Method 1
a shared vacuum pump fluidly coupled to the shared valve
Implementation Method 2
a plurality of dilution gas lines configured to provide a dilution gas into the plurality of exhaust gas lines
Data Source
AI summary
A substrate processing apparatus is disclosed. Exemplary substrate processing apparatus includes a plurality of reaction chambers; a gas supply unit configured to provide the reaction chamber with a main gas; a shared exhaust unit configured to exhaust the main gas from the plurality of reaction chambers; a plurality of exhaust gas lines configured to fluidly couple the shared exhaust unit to the plurality of reaction chambers; and a plurality of dilution gas lines configured to provide a dilution gas into the plurality of exhaust gas lines.