Precursor Vessel With Depressed Flowpath for Low-Temperature Vaporization
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Solution Overview
Problem
Existing precursor delivery systems face challenges in achieving efficient and uniform vaporization of solid precursors at lower temperatures, leading to agglomeration and thermal degradation, which affects the consistency and efficiency of the deposition process.
Innovation Solution
A precursor vessel with a tube having sidewalls with depressions and a serpentine shape, allowing precursor material to be disposed within these depressions, enhancing surface area and enabling rapid vaporization at lower temperatures, and optionally incorporating heat transfer fluids and temperature regulation elements for improved efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid precursor is heated to substantially elevated temperatures to achieve sufficient vaporization, then vaporization efficiency is improved, but precursor agglomeration and thermal degradation occur
Solution Approach 1:
The precursor material is segmented into multiple small particles or granules within the vessel, increasing the total surface area available for vaporization. This allows efficient vaporization at lower temperatures without requiring substantial elevation of temperature, thereby preventing agglomeration and thermal degradation while maintaining high vaporization efficiency
Solution Approach 2:
Different regions within the precursor vessel are designed with varying properties to optimize vaporization. The vessel includes a heating zone with controlled temperature distribution, ensuring that precursor material is heated uniformly and efficiently without localized overheating that would cause degradation, while maintaining overall high vaporization efficiency
2Quantity of substance
If precursor material is heated to elevated temperatures for extended periods, then sufficient vaporization is achieved, but precursor surface area is reduced due to agglomeration
Solution Approach 1:
The precursor material is pre-formed into small particles or granules with high surface area before being placed in the vaporization vessel. This preliminary segmentation ensures that when heating begins, the material maintains high surface area throughout the vaporization process, preventing agglomeration and sustaining high vapor concentration without requiring extended heating periods
Solution Approach 2:
The vessel design ensures continuous and uniform heating of the precursor material, maintaining consistent vaporization rates over time. The controlled heating mechanism prevents temperature fluctuations that would cause agglomeration, ensuring continuous vapor production with sustained surface area availability throughout the deposition process
3Speed
If elevated temperatures are used to vaporize solid precursor, then vaporization rate is improved, but thermal degradation of precursor material occurs
Solution Approach 1:
The vaporization process utilizes changes in physical parameters, specifically transitioning from bulk heating to surface-level heating of pre-segmented particles. By changing the size distribution and surface area parameters of the precursor material, the system achieves high vaporization rates at lower temperatures, avoiding thermal degradation while maintaining fast vaporization speed through increased surface-to-volume ratio
4Device complexity
If precursor material is placed in locations not in contact with gas flow, then vessel simplicity is maintained, but vaporization efficiency is reduced
Solution Approach 1:
The precursor material is positioned directly within the gas flow path of the vaporization vessel, merging the heating and gas flow functions into a single integrated zone. This ensures that all precursor material is in direct contact with carrier gas flow, maximizing vaporization efficiency without requiring complex multi-zone structures or separate heating and gas delivery systems
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 allows for more rapid and efficient vaporization of precursors at reduced temperatures, preventing agglomeration and thermal degradation, thereby improving the consistency and reducing the amount of precursor material required for deposition processes.
Implementation Method 1
vaporizing the precursor material within the tube
Implementation Method 2
the carrier gas carries the vaporized precursor material to the reaction chamber
Data Source
AI summary
A precursor vessel for a vapor deposition process is disclosed. The vessel includes a housing having an inlet, an outlet, and defining an interior volume. A tube is disposed within the interior volume and extends from the inlet to the outlet. The tube has sidewalls defining a flowpath there through. The sidewalls have an internal surface facing the flowpath having a plurality of depressions in the internal surface having a depth and a width. A solid precursor material may be loaded into the depressions. A system including the precursor vessel and a vapor deposition process are further disclosed herein.