Sealed Source Fitting for Gas Deposition Reactors
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Solution Overview
Problem
Existing methods for installing and removing solid source materials in gas deposition reactors are prone to contamination, are complex, unreliable, and difficult to use due to the reactivity and sensitivity of the materials, and often require high temperatures that shorten valve lifespan and create heat bridges, limiting the range of available materials and increasing costs.
Innovation Solution
A source with a chamber that is openable and closable, using sliding cover-like isolating means to isolate the source material from the environment, allowing for inert handling and operation at high temperatures without valves, and enabling easy replacement and secure transfer of materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If solid source materials are installed using traditional methods with open crucibles, then the installation process is simple, but contamination occurs because the materials are highly reactive and sensitive to oxygen and moisture
Solution Approach 1:
The patent employs an inert atmosphere within the source fitting and transfer chamber to protect reactive solid source materials from oxidation and moisture contamination during installation and removal operations. The sealed environment with controlled atmosphere prevents harmful reactions while maintaining operational simplicity.
2Object-affected harmful factors
If metallic bottles with valves are used to install solid sources, then inert handling is achieved, but the highest operating temperature is limited to approximately 200 to 250° C. due to valve constraints
Solution Approach 1:
The patent removes valves from the system entirely, extracting the temperature-limiting component. Instead of using metallic bottles with valves, the invention employs a valve-free sealed source fitting design that can withstand high temperatures while maintaining inert handling capabilities through alternative sealing mechanisms.
Solution Approach 2:
The patent employs disposable or replaceable source fittings and crucibles that can be pre-prepared and sealed at high temperatures. These components are designed to be replaced rather than reused, eliminating the need for temperature-limited valves while maintaining cost-effectiveness.
3Object-affected harmful factors
If metallic bottles are used for source installation, then inert handling is provided, but the bottles are large and heavy, difficult to install and detach, and expensive
Solution Approach 1:
The patent divides the source handling system into segmented, modular components including the source fitting, crucible, and transfer mechanisms. This segmentation allows for smaller, lighter individual parts that are easier to install and remove while maintaining the inert handling protection through sealed connections between segments.
Solution Approach 2:
The patent employs disposable or easily replaceable source fittings and crucibles made from materials that can be prepared offline and quickly exchanged. These components are designed for single-use or limited-use cycles, reducing the need for heavy-duty reusable equipment while maintaining protection against oxidation and moisture.
4Adaptability or versatility
If a multi-branch candelabrum-like pipework is used to hold solid sources, then multiple sources can be heated independently, but the structure is complex and the charging process is difficult
Solution Approach 1:
The patent segments the source holding and heating system into independent modular units, each with its own heating zone and source container. This segmentation maintains the capability to heat multiple sources independently while simplifying the overall structure compared to a complex candelabrum-like pipework system.
Solution Approach 2:
The patent employs universal source fittings and crucible designs that can be used across multiple heating zones and reactor configurations. This multi-functionality reduces the need for specialized complex pipework for each source position, simplifying both the structure and the charging process while maintaining independent heating capability.
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 allows for safe, efficient, and cost-effective handling of sensitive source materials at high temperatures, reducing contamination risks and simplifying the installation and removal process, while expanding the range of usable materials and reducing operational complexity.
Implementation Method 1
cover-like isolating means arrangeable onto the wall of the chamber for isolating the chamber from environment
Implementation Method 2
Since vapour pressures of solid materials are quite low (typically less than 1 mbar at room temperature), they have to be heated in order to achieve a sufficient vapour pressure
Implementation Method 3
solid sources have been tubes that have been placed in an oven... a source crucible was placed in a plastic bag while inserting it into a source tube so as to prevent the source material from becoming oxidized or from evaporating into room air
Data Source
AI summary
The invention relates to an arrangement for installing a source into a gas deposition reactor. The arrangement comprises at least one source fitting for the source such that the source fitting is connected to a reaction space of the gas deposition reactor, and a source installable at least partly inside the source fitting or a source space connected to the source fitting. According to the invention, the arrangement further comprises reception means in the source fitting for receiving the source, and charging means for installing the source in place in the source fitting for use, and a chamber (1), provided in the source, for a solid or liquid source material (3), and isolating means (7, 19) for isolating the chamber (1) substantially from environment.