Pre-abatement Modules for Semiconductor Pumping Line Safety
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Solution Overview
Problem
In semiconductor fabrication, incompatible process gas flows in vacuum pumping systems can mix catastrophically due to mechanical or control failures, leading to potential reactions, which existing technologies fail to prevent effectively without interfering with the intended process flows.
Innovation Solution
Incorporating pre-abatement modules in each pumping line to neutralize incompatible constituents from adjacent process flows, using agents like calcium carbonate or silicon to remove fluorine and transitional metal fluorides to remove silane, ensuring minimal impact on intended flows during normal operation but preventing catastrophic reactions during failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pre-abatement modules are added to neutralize incompatible constituents, then safety against catastrophic reactions is improved, but device complexity increases
Solution Approach 1:
The pre-abatement modules are positioned upstream in the pumping line to neutralize incompatible constituents before they can mix catastrophically. Calcium carbonate or silicon materials are placed in the pre-abatement module to react with and neutralize incompatible process gases (such as fluorine-containing gases) before they reach the main pumping system, preventing catastrophic reactions while maintaining system functionality
Solution Approach 2:
The pre-abatement module acts as an intermediary component between the process chamber and the main pumping system. It contains materials like calcium carbonate or silicon that serve as chemical mediators to neutralize incompatible constituents, allowing the system to handle multiple incompatible process gases safely without requiring complete system redesign
2Reliability
If pre-abatement modules are positioned immediately downstream of the valve module, then protection against mixing is improved, but loss of time for neutralization increases
Solution Approach 1:
By positioning the pre-abatement module immediately downstream of the valve module, the system performs preliminary neutralization of incompatible constituents as soon as they enter the pumping line. This early intervention prevents mixing with intended process flows while minimizing the time window for potential reactions, balancing safety with process efficiency
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 pre-abatement modules effectively prevent catastrophic mixing of incompatible gas flows during adverse conditions while maintaining optimal processing of intended flows, enhancing the efficiency and safety of semiconductor fabrication processes.
Implementation Method 1
using agents like calcium carbonate or silicon to remove fluorine
Implementation Method 2
transitional metal fluorides to remove silane
Data Source
Figure 1
Figure 2
AI summary
In the field of semiconductor fabrication there is a need to ensure that different incompatible process flows do not mix with one another in a manner whereby there is a high risk of a catastrophic reaction between the different process flows taking place. A pumping line arrangement (10) comprises a chamber connecting line (12) which is fluidly connectable to a process chamber (14) that forms part of a semiconductor fabrication tool (15). The pumping line arrangement (10) also includes a valve module (16) which is fluidly connected to the chamber connecting line (12). The valve module (16) splits the chamber connecting line (12) into respective first and second pumping lines (18, 20). The first pumping line (18) is intended to carry a first process flow and the second pumping line (20) is intended to carry a second process flow which is incompatible with the first process flow. At least one of the first pumping line (18) or the second pumping line(20) includes fluidly connected therewithin a pre-abatement module (26, 28) that is configured to remove one or more incompatible constituents from the process flow intended to be carried by the other pumping line (18, 20).