Atmosphere Control System for Semiconductor Wafer Processing
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Solution Overview
Problem
Existing substrate processing apparatuses face challenges in maintaining a controlled low-oxygen atmosphere during semiconductor wafer processing, leading to oxidation of coating films and inefficient gas usage, which affects the quality and cost-effectiveness of the manufacturing process.
Innovation Solution
A substrate processing apparatus with a multi-layered atmosphere control system, including nitrogen gas supply and exhaust units, circulation conduits, and fan filter units, that maintains a low-oxygen environment through precise control of gas flow rates and pressures within the processing and transfer zones, minimizing gas consumption and oxidation risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitrogen gas is continuously supplied into the processing chamber and region to maintain low-oxygen atmosphere, then oxidation of coating film is suppressed, but gas consumption increases
Solution Approach 1:
The gas supply is performed periodically rather than continuously. The gas supply unit supplies atmosphere control gas at specific intervals (when the chamber is opened or when oxygen concentration increases) rather than maintaining constant flow, thereby reducing overall gas consumption while still preventing oxidation effectively
Solution Approach 2:
The oxygen concentration detection unit continuously monitors the oxygen level in the processing chamber and provides feedback to the gas supply unit. When oxygen concentration exceeds a threshold or when the chamber is opened, the system automatically increases gas supply to maintain low-oxygen atmosphere, and reduces supply when conditions are favorable, optimizing gas usage based on actual needs
2Reliability
If nitrogen gas is supplied into the region surrounded by panels to maintain low-oxygen atmosphere, then coating film oxidation is suppressed, but manufacturing cost increases
Solution Approach 1:
Atmosphere control gas is supplied periodically based on operational conditions (chamber opening, oxygen concentration levels) rather than continuously, significantly reducing gas consumption and associated manufacturing costs while maintaining adequate protection of the coating film
Solution Approach 2:
The system uses oxygen concentration detection to trigger gas supply only when necessary, creating a cost-effective atmosphere control strategy that balances film protection with reduced gas consumption and lower manufacturing costs
3Reliability
If gas supply rate is increased to rapidly establish low-oxygen atmosphere, then oxidation prevention is improved, but gas consumption increases
Solution Approach 1:
High-rate gas supply is applied periodically during critical moments (chamber opening, oxygen spikes) rather than continuously, achieving effective atmosphere control with minimal overall gas consumption
Solution Approach 2:
The gas supply rate is dynamically adjusted based on real-time oxygen concentration feedback, supplying gas at high rates only when oxidation risk is detected, and reducing or stopping supply when the low-oxygen atmosphere is maintained, optimizing the balance between effectiveness and consumption
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
The apparatus effectively reduces gas consumption and maintains a stable low-oxygen atmosphere, preventing oxidation of coating films and optimizing the semiconductor wafer processing environment, thereby enhancing manufacturing efficiency and reducing costs.
Implementation Method 1
a circulation system having the substrate transfer zone of the substrate processing area and a circulation conduit connected to the substrate transfer zone... configured to circulate an atmosphere adjustment gas within the circulation system
Implementation Method 2
a first gas supply configured to supply an atmosphere control gas to the substrate processing area... a second gas supply configured to supply an atmosphere control gas to the circulation system
Implementation Method 3
a first gas discharge unit configured to discharge an atmosphere inside the substrate processing area... a second gas discharge unit configured to discharge an atmosphere inside the circulation system
Data Source
AI summary
A substrate processing apparatus includes a first atmosphere control system configured to control an atmosphere inside a processing zone of a substrate processing area and a second atmosphere control system configured to control an atmosphere inside a substrate transfer zone of the substrate processing area. The first atmosphere control system supplies, when a liquid processing is performed in a liquid processing unit, an atmosphere control gas to the corresponding liquid processing unit by a first gas supply, and discharges an atmosphere inside the corresponding liquid processing unit by a first gas discharge unit. The second atmosphere control system circulates an atmosphere adjustment gas in a circulation system of the corresponding second atmosphere control system, and discharges an atmosphere inside the circulation system of the second atmosphere control system when at least one of the liquid processing unit is opened to the substrate transfer zone.