Chemical Liquid Gas Concentration Control for Stable Etching
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Solution Overview
Problem
Current semiconductor manufacturing processes face challenges in achieving precise control over gas concentrations in chemical liquids used for wafer etching, leading to inconsistent etching rates and defect counts across different layers, which affects material selectivity and overall process efficiency.
Innovation Solution
A chemical storage system with a tank, gas pipes, valves, and a concentration sensor, controlled by a machine control unit, that adjusts gas flow rates to maintain target concentrations of gases in the chemical liquid, allowing for precise control of etching rates and defect counts by injecting gases such as nitrogen and oxygen to optimize the etching process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gas concentration in chemical liquid is not precisely controlled, then etching process is simpler to operate, but etching rates and defect counts become inconsistent across different layers
Solution Approach 1:
The system employs a concentration sensor to detect the actual gas concentration in the chemical liquid and feeds this information back to a controller. The controller compares the detected concentration with the target concentration and adjusts the gas flow rate accordingly to maintain consistent etching rates across different layers.
Solution Approach 2:
The system dynamically adjusts the gas flow rate parameter based on detected concentration variations. By changing the gas flow rate in response to concentration measurements, the system maintains optimal etching conditions despite variations in chemical liquid composition.
2Manufacturing precision
If gas concentration in chemical liquid is not precisely controlled, then process setup is simpler, but material selectivity deteriorates
Solution Approach 1:
The concentration sensor continuously monitors gas concentration and provides feedback to the controller, which adjusts gas flow rates to maintain precise material selectivity during etching operations across multiple layers.
Solution Approach 2:
The system modifies gas flow rate parameters in real-time based on concentration measurements, ensuring that material selectivity is maintained throughout the etching process despite variations in chemical liquid composition.
3Reliability
If gas concentration in chemical liquid varies, then system operation is simpler, but defect counts increase
Solution Approach 1:
The concentration sensor detects variations in gas concentration and provides feedback to the controller, which adjusts gas flow rates to maintain consistent etching quality and minimize defect generation across all processed layers.
Solution Approach 2:
The system dynamically adjusts gas flow rate parameters in response to concentration measurements, maintaining optimal etching conditions that prevent defect formation while processing multiple layers with varying thicknesses.
4Manufacturing precision
If gas concentration is precisely controlled, then etching rate consistency improves, but system complexity increases
Solution Approach 1:
The concentration sensor and controller work together in a feedback loop to automatically maintain consistent gas concentration, ensuring uniform etching rates across different layers without requiring manual intervention or complex procedural adjustments.
Solution Approach 2:
The system automatically adjusts gas flow rate parameters based on real-time concentration measurements, achieving consistent etching rates while keeping the control system relatively simple through automated parameter modification rather than complex mechanical adjustments.
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 system enables precise control of gas concentrations, ensuring consistent etching rates and low defect counts across different layers, improving material selectivity and overall process efficiency in semiconductor manufacturing.
Implementation Method 1
detecting a concentration of gas dissolved in the chemical liquid
Implementation Method 2
injecting a second gas into the tank based on the detected concentration of the first gas, thereby increasing a concentration of the second gas in the chemical liquid
Data Source
AI summary
A system includes a storage tank, a first gas injection unit, a second gas injection unit, a concentration sensor, a dynamic control unit, and a data processing and analysis module. The storage tank is configured to hold a chemical liquid used in etching processes. The first gas injection unit includes a first gas pipe configured to inject a first gas into the storage tank, and a first adjustable valve mounted on the first gas pipe. The second gas injection unit includes a second gas pipe configured to inject a second gas into the storage tank, and a second adjustable valve mounted on the second gas pipe. The concentration sensor is connected to the storage tank. The dynamic control unit electrically connected to the first and second adjustable valves and the concentration sensor. The data processing and analysis module integrated with the dynamic control unit.