High-Pressure BF₃/H₂ Gas Mixture Filling for Concentration Precision
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Solution Overview
Problem
Existing methods for preparing multicomponent gas mixtures struggle to achieve precise relative proportions and concentrations of constituent gases due to compressibility and susceptibility to temperature variations, which can lead to adverse effects in applications like semiconductor manufacturing.
Innovation Solution
A method involving precision-controlled filling of gas mixture supply vessels by flowing a first gas until a predetermined pressure is reached, then introducing additional gases to achieve precise compositions, using techniques such as cascading filling and thermal control, with optional analytical verification and fine-tuning to ensure accurate concentrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional filling methods are used to prepare gas mixtures, then the filling process is simple and quick, but the concentration precision of gas constituents deteriorates due to compressibility and temperature variations
Solution Approach 1:
The patent applies preliminary action by pre-cooling the gas mixture in a heat exchanger before filling, and by pre-establishing temperature control systems in the filling environment. This preliminary thermal conditioning eliminates temperature variations during filling, thereby achieving precise concentration control without requiring overly complex real-time adjustment mechanisms
Solution Approach 2:
The patent implements feedback control through pressure sensors and temperature monitors that continuously track filling conditions. The system uses this feedback data to dynamically adjust filling rates and thermal compensation, ensuring concentration precision is maintained throughout the process without manual intervention
2Manufacturing precision
If gas filling is performed without temperature control, then the filling process is faster and simpler, but pressure variations increase leading to poor concentration control
Solution Approach 1:
The patent applies preliminary action by pre-cooling the gas mixture in a heat exchanger before filling, and by pre-establishing temperature control systems in the filling environment. This preliminary thermal conditioning eliminates temperature variations during filling, thereby achieving precise concentration control without requiring overly complex real-time adjustment mechanisms
Solution Approach 2:
The patent changes the temperature parameter of the gas mixture during filling by using active cooling systems and temperature-controlled filling chambers. By maintaining constant temperature conditions, the system eliminates thermal expansion/contraction effects that cause pressure variations, thereby achieving stable concentration control
3Manufacturing precision
If high pressure gas mixing is performed without compression control, then the process is simpler, but the compressibility effects cause deviations from target concentrations
Solution Approach 1:
The patent implements feedback control through pressure sensors and temperature monitors that continuously track filling conditions. The system uses this feedback data to dynamically adjust filling rates and thermal compensation, ensuring concentration precision is maintained throughout the process without manual intervention
Solution Approach 2:
The patent actively controls the pressure parameter during gas mixing by using regulated compression systems and pressure-balanced filling mechanisms. By maintaining controlled pressure conditions and compensating for compressibility effects, the system achieves accurate relative proportions of gas constituents
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 method ensures high precision in gas mixture preparation, maintaining set point concentrations and reducing adverse effects in applications like ion implantation, by stabilizing pressure and temperature conditions within the vessels.
Implementation Method 1
compressibility of gas mixture components
Implementation Method 2
susceptibility to temperature variations in the fill environment of the vessels
Data Source
AI summary
Methods are described for filling gas mixture supply vessels with constituent gases to achieve precision compositions of the gas mixture, wherein the gas mixture comprises at least two constituent gases. Cascading fill techniques may be employed, involving flowing of gases from single source vessels to multiple target vessels, or from multiple source vessels to a single target vessel. The methods may be employed to form dopant gas mixtures, e.g., of boron trifluoride and hydrogen, for ion implantation applications.