Dynamic Purge Gas Flow Control for Semiconductor Deposition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing methods for processing semiconductor substrates face challenges in achieving optimal purge gas flow rates, leading to issues such as unwanted film deposition on chamber surfaces, particle contamination, and non-uniform deposition processes, which affect throughput and maintenance requirements.
Innovation Solution
A method that adjusts purge gas flow rates based on geometric hardware configurations and process recipes using sensors and machine learning models to optimize deposition characteristics, ensuring uniformity and reducing unwanted deposition on chamber components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the purge gas flow rate is increased to prevent unwanted film deposition on chamber surfaces, then the likelihood of process gas expanding beyond the substrate is reduced, but the purge gas dilutes and displaces the process gas, slowing the deposition process and reducing throughput
Solution Approach 1:
The system dynamically adjusts purge gas flow rates based on real-time deposition characteristics measured by sensors. The controller modifies flow rate parameters during the deposition process to optimize both prevention of unwanted deposition and maintenance of deposition throughput, rather than using fixed high or low flow rates
Solution Approach 2:
Sensors measure deposition characteristics in real-time and provide feedback to the controller, which then adjusts purge gas flow rates accordingly. This closed-loop control ensures that the purge gas flow rate is optimized based on actual process conditions, preventing unwanted deposition while maintaining acceptable throughput
2Productivity
If the purge gas flow rate is decreased to maintain deposition speed, then throughput is improved, but unwanted film deposition occurs on chamber surfaces and particle contamination increases
Solution Approach 1:
The system varies purge gas flow rate parameters during different phases of the deposition process. Higher flow rates are used when preventing unwanted deposition is critical, while lower flow rates are used to maintain deposition speed, with transitions optimized by the controller based on real-time measurements
Solution Approach 2:
Real-time measurement of deposition characteristics provides feedback that triggers appropriate purge gas flow rate adjustments. When unwanted deposition is detected or predicted, the system increases purge gas flow; when deposition speed is compromised, the system reduces purge gas flow
3Ease of manufacture
If a fixed high purge gas flow rate is used to ensure clean chamber surfaces, then maintenance requirements are reduced, but the deposition process becomes non-uniform and process drift occurs
Solution Approach 1:
The system transitions from static fixed flow rates to dynamic adaptive flow rates that change during the deposition process. The purge gas flow rate is continuously adjusted based on real-time deposition characteristics, allowing optimization at different stages of the deposition process
Solution Approach 2:
The controller modifies purge gas flow rate parameters in response to measured deposition characteristics, enabling the system to adapt to changing process conditions and maintain deposition uniformity while reducing maintenance requirements
Data Source
AI summary
Embodiments herein provide for a method of processing a semiconductor substrate. The method described herein may include receiving a first input corresponding to a first geometric hardware configuration of a process chamber, receiving a second input corresponding to a first process recipe of the process chamber, determining, based on the first input and the second input, a first purge gas flow rate for the process chamber, measuring a deposition characteristic of the process chamber via a first sensor, determining, based on the first input, the second input, and the measured deposition characteristic, a second purge gas flow rate, the second purge gas flow rate different from the first purge gas flow rate, and flowing a purge gas at the second purge gas flow rate during a deposition process.