Liquid Precursor Metering for Halide Vapor Phase Epitaxy
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Solution Overview
Problem
Existing chemical vapor deposition (CVD) systems for depositing III-V semiconductor materials, such as gallium nitride (GaN), face challenges in accurately metering and controlling the flow of precursor liquids before vaporization, leading to inconsistencies in the deposition process.
Innovation Solution
The system meters and controls the flow rate of precursor liquids, such as GaCl3, InCl3, and AlCl3, in their liquid state before vaporization, forming precursor vapors that are then deposited onto a substrate within a reaction chamber, allowing for precise control of the deposition process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If mass flow controllers are used to meter and control process gases in gas or vapor state, then the deposition process can be controlled, but the precision and consistency of precursor delivery is insufficient
Solution Approach 1:
The patent changes the physical state parameter of the precursor from gas/vapor to liquid, and controls the flow rate in liquid state before vaporization. This parameter change enables more precise metering and control of the precursor delivery, resolving the contradiction between measurement precision and deposition consistency.
Solution Approach 2:
The system performs preliminary metering and control of the precursor liquid flow rate before vaporization occurs. By controlling the flow in liquid state first, then vaporizing, the system ensures precise precursor delivery and consistent deposition process, addressing the reliability issue.
2Device complexity
If precursor liquids are vaporized directly without controlled flow metering, then the system is simpler, but the deposition precision and quality consistency deteriorates
Solution Approach 1:
The patent introduces an intermediary liquid state control system between the precursor source and the vaporization chamber. This intermediary liquid flow metering system acts as a mediator that enables precise control without significantly increasing overall system complexity, while improving deposition precision.
3Productivity
If uncontrolled flow rates of precursor vapors are used, then the process is faster and simpler, but the quality and consistency of semiconductor materials formed deteriorates
Solution Approach 1:
The system maintains continuous controlled flow of precursor liquid into the vaporization chamber, ensuring consistent vapor generation and deposition. This continuous controlled action improves both the efficiency and quality consistency of semiconductor material formation, resolving the contradiction between productivity and manufacturing precision.
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 approach enhances the precision and efficiency of III-V semiconductor material deposition by ensuring consistent and controlled flow rates of precursor vapors, improving the quality and consistency of the semiconductor materials formed.
Implementation Method 1
The precursor liquid may be vaporized within the vaporizer to form a first precursor vapor
Implementation Method 2
In chemical vapor deposition processes, a substrate is exposed to one or more reagent gases, which react, decompose, or both react and decompose in a manner that results in the deposition of a solid material on the surface of the substrate
Implementation Method 3
VPE processes are often used to deposit III-V semiconductor materials... results in the epitaxial deposition of a solid material on the surface of the substrate
Data Source
AI summary
Methods of depositing compound semiconductor materials on one or more substrates include metering and controlling a flow rate of a precursor liquid from a precursor liquid source into a vaporizer. The precursor liquid may comprise at least one of GaCl3, InCl3, and AlCl3 in a liquid state. The precursor liquid may be vaporized within the vaporizer to form a first precursor vapor. The first precursor vapor and a second precursor vapor may be caused to flow into a reaction chamber, and a compound semiconductor material may be deposited on a surface of a substrate within the reaction chamber from the precursor vapors. Deposition systems for performing such methods include devices for metering and/or controlling a flow of a precursor liquid from a liquid source to a vaporizer, while the precursor liquid remains in the liquid state.