Gas Showerhead with Periphery Curtain for MOCVD Film Quality
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Solution Overview
Problem
The quality of thin films formed by current metal organic chemical vapor deposition (MOCVD) devices is poor due to incomplete reactions and by-product formation on the internal walls of the reaction chamber, leading to impurities and reduced utilization of gases.
Innovation Solution
A gas shower device with a showerhead design featuring a center region and periphery region, where the periphery region outputs a second gas to create a gas curtain that isolates the first gas from the reaction chamber walls, ensuring pure gas reactions and stable gas flow, and the center region delivers the first gas for film formation, preventing by-product formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If gas is introduced into the reaction chamber using conventional inlet devices, then the deposition process can be completed, but by-products form on the internal walls of the reaction chamber leading to poor film quality
Solution Approach 1:
The gas outlet structure is segmented into multiple independent gas outlets arranged in specific patterns, with each outlet delivering gas to different regions of the substrate. This segmentation allows precise control of gas distribution and prevents by-product formation on chamber walls while maintaining high film quality.
Solution Approach 2:
A gas distribution mechanism acts as an intermediary between the gas source and the reaction chamber, controlling gas flow paths to ensure reactions occur only where intended. This intermediary structure prevents direct contact of reactants with chamber walls, eliminating by-product formation.
2Productivity
If reaction gases are introduced using conventional methods, then the deposition process proceeds, but gas utilization is reduced due to incomplete reactions and by-product formation
Solution Approach 1:
The gas delivery system changes parameters such as gas flow rate, pressure, and distribution pattern to optimize reaction efficiency. By adjusting these parameters through the multi-outlet configuration, the system achieves complete reactions with minimal gas waste, improving both productivity and gas utilization.
3Manufacturing precision
If the showerhead has multiple gas outlets for uniform gas distribution, then film uniformity improves, but the structure becomes more complex
Solution Approach 1:
The showerhead structure is designed to perform multiple functions simultaneously: it distributes gas uniformly across the substrate, controls flow patterns, and prevents by-product formation. This multi-functionality is achieved through a unified multi-outlet structure that combines several features into a single integrated component, maintaining simplicity while achieving complex objectives.
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 design improves the quality and uniformity of the thin films formed by preventing by-product formation on the reaction chamber walls, increasing gas utilization, and reducing operational costs by maintaining stable gas flow and pure gas reactions.
Implementation Method 1
the periphery region outputs a second gas to create a gas curtain that isolates the first gas from the reaction chamber walls
Implementation Method 2
Chemical vapor deposition (referred to as CVD) is the process technology that the reaction substances react under the gaseous condition to generate solid substance deposited on the surface of the heated solid substrate
Implementation Method 3
conducting vapor phase epitaxy on the substrate by thermal decomposition to grow various II-VI groups of compound semiconductors, III-V groups of compound semiconductors
Implementation Method 4
conducting vapor phase epitaxy on the substrate by thermal decomposition to grow various II-VI groups of compound semiconductors, III-V groups of compound semiconductors
Data Source
AI summary
A gas shower device, a device and a method for chemical vapor deposition. A gas shower device has a showerhead. The showerhead includes a center region and a periphery region surrounding the center region; the center region and periphery region of the showerhead have a plurality of second gas-outlets which are arranged in parallel; the second gas-outlets are used to output the second gas; a first gas-outlet arranged between two adjacent second gas-outlets, includes the first sub-gas-outlet located in the center region and the second sub-gas-outlet located in the periphery region; the first sub-gas-outlet and the second sub-gas-outlet are mutually isolated, the first sub-gas-outlet is used to output the first gas and the second sub-gas-outlet is used to output the second gas; a first gas channel is connected to the first sub-gas-outlet; a second gas channel is connected to the second gas-outlet and the second sub-gas-outlet. The film formation quality is improved by using the chemical vapor deposition device with the gas shower device.