Porous Precursor Support for Stable Vapor Delivery
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Solution Overview
Problem
Conventional vapor phase delivery systems for solid precursor compounds in chemical vapor deposition (CVD) face challenges with non-uniform and unstable flow rates, leading to inconsistent precursor vapor concentrations, which are detrimental to semiconductor film growth, especially at higher flow rates or low pressures.
Innovation Solution
A dual-chambered vapor phase delivery device with a solid precursor compound and a layer of packing material, where the packing material includes a stabilizing agent, provides a consistent and stable concentration of precursor vapor by ensuring uniform carrier gas flow and preventing channeling, allowing for higher flow rates without decomposition of the precursor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher carrier gas flow rates are used to increase precursor transportation rate, then film growth rate increases, but precursor vapor concentration becomes unstable and decomposition occurs
Solution Approach 1:
The patent introduces a porous precursor support material as an intermediary between the solid precursor compound and the carrier gas. This support material provides a large surface area that stabilizes precursor vaporization and maintains consistent precursor vapor concentration even at higher carrier gas flow rates, preventing the instability and decomposition that occur with conventional direct vaporization methods
Solution Approach 2:
The patent employs a porous precursor support material with controlled pore structure to hold and vaporize the solid precursor compound. The porous structure increases the effective surface area for vaporization and creates a diffusion path that stabilizes precursor vapor release, enabling higher carrier gas flow rates without losing concentration stability or causing precursor decomposition
2Device complexity
If conventional bubbler systems are used for solid precursors, then device simplicity is maintained, but precursor delivery rate becomes non-uniform and erratic
Solution Approach 1:
The patent replaces the liquid-filled bubbler structure with a solid porous precursor support material that can be directly saturated with solid precursor compound. This simplified solid-state configuration eliminates the complexity of liquid handling while providing uniform precursor delivery through the porous structure's consistent vaporization characteristics
Solution Approach 2:
The patent changes the physical state parameter from liquid carrier gas bubbling through solid precursor to solid precursor compound saturation of porous support material with carrier gas flow. This parameter change from liquid-phase to solid-phase precursor delivery simplifies the device structure while improving flow rate uniformity through the porous material's controlled vapor release
3Device complexity
If solid precursor compound bed is used without packing material, then device simplicity is maintained, but channeling occurs and vapor phase concentration decreases
Solution Approach 1:
The patent uses a porous precursor support material as packing material that prevents channeling by providing a uniform porous structure for carrier gas flow. The porous structure distributes flow evenly throughout the precursor compound bed, preventing preferential flow paths and maintaining high precursor vapor phase concentration without adding significant device complexity
Solution Approach 2:
The patent creates a composite structure by saturating a porous support material with solid precursor compound. This composite material combines the structural benefits of the porous support (channeling prevention) with the vaporization properties of the precursor compound, maintaining vapor phase concentration without requiring complex separate packing material layers
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 solution achieves a stable and uniform precursor vapor concentration for extended periods, even at high flow rates and low pressures, improving the yield and consistency of semiconductor film growth by preventing channeling and maintaining high precursor concentrations until depletion.
Implementation Method 1
a vapor phase delivery device for solid precursor compounds including an outlet chamber and an inlet chamber including a precursor composition including a solid precursor compound
Implementation Method 2
A carrier gas is employed to pick up the precursor compound vapor and transport it to a deposition system
Data Source
AI summary
Delivery devices for delivering solid precursor compounds in the vapor phase to reactors are provided. Such devices include a precursor composition of a solid precursor compound with a layer of packing material disposed thereon. Also provided are methods for transporting a carrier gas saturated with the precursor compound for delivery into such CVD reactors.