Compacted Solid Precursors for Vapor Flux in CVD
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Solution Overview
Problem
Current solid precursors used in vapor deposition processes, such as semiconductor manufacturing and LED production, face limitations in achieving high precursor vapor flux and efficient thermal management, leading to increased costs and handling challenges.
Innovation Solution
Compacting particulate precursor materials into dense solid bodies like pellets or monoliths, which when heated, yield significantly higher precursor vapor flux and reduce particle transport issues, allowing for more efficient vapor generation and lower costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If solid precursors are used in finely divided form to maximize surface to volume ratio, then surface area for phase transition is increased, but particle transport issues and need for fine particle filters increase
Solution Approach 1:
The invention changes the physical form parameter of the solid precursor from finely divided powder to compacted pellets or monolithic structures. This parameter change maintains sufficient surface area for vaporization while eliminating particle transport problems that occur with loose powders
Solution Approach 2:
The invention uses composite structures where particulate precursor is compacted into pellet forms or integrated into monolithic supports with high surface area structures (such as porous materials or structured geometries), combining the benefits of high surface area with the handling advantages of compacted form
2Ease of operation
If solid precursors are compacted into dense solid bodies, then handling characteristics and volumetric efficiency are improved, but surface to volume ratio decreases
Solution Approach 1:
The invention optimizes the compaction parameters to achieve a balance between density (for handling) and surface area (for vaporization). By controlling compaction pressure and temperature, pellets are formed that are dense enough for easy handling but retain sufficient external surface area for effective phase transition
Solution Approach 2:
The invention transitions from two-dimensional surface area considerations in powders to three-dimensional structured pellets or monoliths, where internal porosity or structured geometry provides additional surface area while maintaining compact external dimensions for easy handling
3Quantity of substance
If more precursor is loaded in the same vaporizer volume, then cost-of-ownership is reduced, but thermal management becomes more difficult
Solution Approach 1:
The invention changes the physical state and thermal properties of the loaded precursor by compacting it into pellets or monoliths, which have different thermal conductivity and heat capacity characteristics compared to loose powders, enabling better thermal management while increasing loading capacity
Solution Approach 2:
The invention employs porous or structured pellet/monolith designs that provide high surface area within compact volumes. The porous structure allows for improved heat distribution and mass transport while maintaining high precursor loading density in the vaporizer
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 compacted solid precursors achieve precursor vapor flux increases of up to 50% or more compared to finely divided powders, with improved handling and reduced need for fine particle filters, enhancing the efficiency and cost-effectiveness of vapor deposition processes.
Implementation Method 1
solid precursors that are volatilized to form corresponding precursor vapor
Implementation Method 2
phase transition of the solid to a vapor form
Data Source
AI summary
A solid delivery precursor is described, which is useful for volatilization to generate precursor vapor for a vapor deposition process. The solid delivery precursor comprises solid bodies of compacted particulate precursor, e.g., in a form such as pellets, platelets, tablets, beads, discs, or monoliths. When utilized in a vapor deposition process such as chemical vapor deposition, pulsed chemical vapor deposition, or atomic layer deposition, the solid delivery precursor in the form of solid bodies of compacted particulate precursor provide substantially increased flux of precursor vapor when subjected to volatilization conditions, in relation to the particulate precursor. As a result, vapor deposition process operation can be carried out in shorter periods of time, thereby achieving increased manufacturing rates of products such as semiconductor products, flat-panel displays, solar panels, LEDs, optical coatings, and the like.