Ampoule Assembly Bypass Line for CVD Purging
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Solution Overview
Problem
The existing methods for replacing ampoules in chemical vapor deposition (CVD) and atomic layer deposition (ALD) systems require manual intervention, leading to potential leakage and contamination risks due to the presence of toxic and reactive precursors, and inefficient purging of dead legs in the fluid delivery system.
Innovation Solution
An ampoule assembly with a bypass line and remotely controllable valves allows for remote operation of the pump-purge process, reducing the need for manual intervention and minimizing leakage risks by actively passing purge fluids through the system, including the use of thermally conductive coatings for uniform heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual intervention is used for ampoule replacement, then the process can be completed with simple equipment, but the risk of leakage and contamination increases due to toxic precursors
Solution Approach 1:
The patent replaces manual mechanical operations with an automated pump-purge system that uses fluid dynamics to perform ampoule replacement. The system automatically isolates, purges, and replaces ampoules without requiring maintenance personnel to manually handle valves or enter the gas cabinet, thereby eliminating leakage risks associated with manual intervention.
Solution Approach 2:
The system enables self-service operation where the ampoule replacement process is automatically executed by the equipment itself. The pump-purge system autonomously performs isolation, purging, and replacement operations without human intervention, allowing the system to service itself while maintaining safety against toxic precursor exposure.
2Reliability
If traditional purging methods are used without bypass lines, then the system structure remains simple, but dead legs cannot be effectively purged leading to contamination
Solution Approach 1:
The patent segments the fluid delivery system by introducing a bypass line that creates alternative flow paths. This segmentation allows the system to isolate and purge dead legs separately from the main flow path, ensuring complete removal of toxic residues from all areas including previously inaccessible dead ends.
Solution Approach 2:
The bypass line acts as an intermediary pathway that enables effective purging of dead legs. By providing this intermediate route, purge fluids can reach and flush out contaminated areas that would otherwise be inaccessible, using the bypass as a mediator to transport cleaning fluids through the entire system including dead ends.
3Object-affected harmful factors
If ampoules are located inside a protective housing for safety, then personnel protection is improved, but maintenance personnel must still enter the gas cabinet for ampoule replacement
Solution Approach 1:
The patent replaces manual mechanical access operations with automated remote operation. The pump-purge system allows ampoule replacement to be executed remotely without maintenance personnel needing to physically enter the gas cabinet, substituting automated fluid-based operations for manual mechanical access while maintaining the protective housing integrity.
4Reliability
If multiple pump-purge cycles are performed to remove toxic residues, then purification effectiveness is improved, but the process time increases
Solution Approach 1:
The patent implements continuous purging action by establishing bypass lines that enable uninterrupted fluid flow through the system. Instead of discrete, interrupted pump-purge cycles, the system maintains continuous circulation of purge fluids through all pathways including dead legs, achieving thorough contamination removal in a single continuous operation rather than multiple interrupted cycles.
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 solution enables more efficient and safer ampoule replacement and purging processes, reducing the risk of contamination and leakage, and improving the uniformity of temperature within the ampoule, thus enhancing the reliability and safety of CVD and ALD operations.
Implementation Method 1
a bypass line connected between the inlet line and the outlet line, the bypass line having a shut-off valve disposed therein to fluidly couple or decouple the inlet line and the outlet line
Implementation Method 2
one or more thermally conductive coatings that improve the uniformity of temperature inside the ampoule body
Implementation Method 3
a carrier gas is passed through a heated container, or ampoule, which contains a volatile liquid precursor under conditions conducive to vaporize the precursor
Implementation Method 4
a carrier gas is passed through a heated container containing a solid precursor under conditions conducive to sublimation of the solid precursor
Data Source
AI summary
Embodiments described herein provide ampoule assemblies to contain, store, or dispense chemical precursors. In one embodiment, an ampoule assembly is provided which includes an ampoule containing a first material layer disposed on the outside of the ampoule and a second material layer disposed over the first material layer, wherein the first material layer is thermally more conductive than the second material layer, an inlet line in fluid communication with the ampoule and containing a first manual shut-off valve disposed therein, an outlet line in fluid communication with the ampoule and containing a second manual shut-off valve disposed therein, and a first bypass line connected between the inlet line and the outlet line. In some embodiments, the ampoule assembly may contain disconnect fittings. In other embodiments, the first bypass line has a shut-off valve disposed therein to fluidly couple or decouple the inlet line and the outlet line.