High-Pressure BF3/H2 Gas Filling for Precise Mixture Composition
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Solution Overview
Problem
Existing methods for preparing multicomponent gas mixtures struggle to achieve precise concentrations of constituent gases due to compressibility and susceptibility to temperature variations, leading to pressure fluctuations and adverse effects in semiconductor manufacturing and other applications.
Innovation Solution
A method involving the precise filling of gas mixture supply vessels by flowing a first gas into target vessels until a predetermined pressure is reached, then introducing additional gases to achieve precise concentrations, using cascading techniques and thermal control to ensure accurate pressure and composition.
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 constituent gases deteriorates due to compressibility and temperature variations
Solution Approach 1:
The filling process is divided into multiple sequential steps: first filling the vessel with one gas component to a predetermined pressure, then separately introducing second and third gas components. This segmentation allows each gas to be controlled independently, eliminating concentration precision issues caused by simultaneous mixing while maintaining a manageable process structure.
Solution Approach 2:
The first gas component is introduced and stabilized at a predetermined pressure before the other gas components are added. This preliminary action establishes a stable base concentration that is less susceptible to subsequent variations, allowing precise control of the final mixture composition even in the presence of temperature and compressibility effects.
2Productivity
If gas components are introduced simultaneously, then the filling time is reduced, but the concentration control deteriorates due to pressure fluctuations from compressibility and temperature variations
Solution Approach 1:
The simultaneous introduction of multiple gas components is replaced by sequential introduction. Each gas component is added in a separate step with dedicated pressure stabilization, ensuring precise concentration control. The process maintains efficiency by using a single vessel and systematic procedure rather than parallel operations.
Solution Approach 2:
Pressure measurements are taken after each gas introduction step to verify that predetermined pressures are achieved. This feedback mechanism allows real-time adjustment and confirmation of concentration precision, compensating for compressibility and temperature variations without requiring simultaneous filling operations.
3Adaptability or versatility
If pressure variations are allowed during filling, then the filling process is more tolerant to temperature changes, but the concentration precision of gas constituents deteriorates
Solution Approach 1:
Each gas component is introduced and stabilized at a predetermined pressure before the next gas is added. This preliminary stabilization creates a stepwise pressure control regime that isolates each gas concentration from subsequent pressure variations, maintaining precision while allowing the final mixture to adapt to temperature changes.
Solution Approach 2:
The filling process uses predetermined pressure values as control parameters for each gas introduction step. By changing the pressure parameter in a controlled, sequential manner rather than maintaining constant pressure throughout, the process achieves both temperature tolerance and concentration precision through parameter optimization.
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 enables the preparation of gas mixtures with high precision, maintaining set point concentrations and reducing adverse effects such as inadequate ionization and component degradation in semiconductor processes.
Implementation Method 1
introducing a second gas component and a third gas component into the same vessel to form a multicomponent gas mixture
Implementation Method 2
flowing the constituent first gas to at least one of the multiple target 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.