Multi-gas Showerhead Segmentation for Uniform GaN Deposition
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Solution Overview
Problem
Existing methods for depositing Group III-nitride films, such as GaN, face challenges in achieving uniform precursor mixing and consistent film quality over larger substrates and areas, which affects the efficiency and cost-effectiveness of semiconductor device production.
Innovation Solution
A gas delivery apparatus with parallel gas flow channels and injection holes for precursor gases, combined with mixing and heat exchanging channels, ensures uniform gas distribution and temperature control, enhancing precursor mixing and film deposition uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional gas delivery methods are used, then the apparatus is simpler, but deposition uniformity and film quality deteriorate over larger substrates
Solution Approach 1:
The gas delivery apparatus is segmented into multiple independent flow channels (first precursor gas channels, second precursor gas channels, carrier gas channels) that are distributed across the showerhead surface. Each channel delivers gas to specific regions, enabling localized control of precursor distribution and achieving uniform deposition across large substrate areas through systematic segmentation of the gas delivery function.
Solution Approach 2:
Different regions of the showerhead are equipped with different types of gas channels and injection holes tailored to local requirements. The first precursor gas channels, second precursor gas channels, and carrier gas channels are strategically positioned to provide optimized gas distribution to different zones of the substrate, ensuring uniform precursor mixing and deposition quality across the entire large substrate surface.
2Productivity
If larger substrates are processed, then throughput and productivity increase, but precursor mixing uniformity deteriorates
Solution Approach 1:
The showerhead is divided into multiple flow channels (first precursor gas channels, second precursor gas channels, carrier gas channels) with numerous injection holes distributed across the surface. This segmentation allows each channel to serve specific regions of large substrates, maintaining uniform precursor mixing even when processing multiple or large-area substrates simultaneously, thereby preserving deposition quality while increasing throughput.
Solution Approach 2:
The gas delivery system transitions from a single-point or single-plane injection approach to a multi-dimensional distributed channel network. Multiple flow channels are arranged in specific patterns (e.g., radial, concentric, or grid arrangements) to deliver precursors uniformly across the entire substrate surface, enabling consistent precursor mixing over large areas and supporting high-volume production without sacrificing uniformity.
3Productivity
If more substrates are deposited simultaneously, then production efficiency increases, but temperature control and mixing consistency deteriorate
Solution Approach 1:
The gas delivery apparatus incorporates multiple carrier gas channels interspersed among the precursor gas channels, creating a segmented flow pattern that ensures uniform gas distribution and thermal management across regions where multiple substrates are processed simultaneously. This segmentation maintains consistent temperature and mixing conditions throughout the processing zone, enabling high-volume production with uniform film quality.
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 improves deposition uniformity and film quality, increasing throughput and reducing costs by ensuring consistent precursor mixing and temperature regulation across larger substrates, thereby enhancing the efficiency of semiconductor production.
Implementation Method 1
a plurality of straight and parallel gas flow channels for a first precursor gas and a plurality of straight and parallel gas flow channels for a second precursor gas
Implementation Method 2
mixing channels disposed downstream from the first and the second gas injection holes for mixing a first gas injected through the first gas injection holes and a second gas injected through the second gas injection holes
Implementation Method 3
heat exchanging channels disposed between the gas injection holes, and formed within walls that extend in the direction of the gas injection past the gas injection holes toward a substrate processing volume
Implementation Method 4
One method that has been used for depositing Group III-nitrides, such as GaN, is metal organic chemical vapor deposition (MOCVD)
Data Source
AI summary
A method and apparatus that may be utilized for chemical vapor deposition and/or hydride vapor phase epitaxial (HVPE) deposition are provided. In one embodiment, a metal organic chemical vapor deposition (MOCVD) process is used to deposit a Group III-nitride film on a plurality of substrates. A Group III precursor, such as trimethyl gallium, trimethyl aluminum or trimethyl indium and a nitrogen-containing precursor, such as ammonia, are delivered to a plurality of straight channels which isolate the precursor gases. The precursor gases are injected into mixing channels where the gases are mixed before entering a processing volume containing the substrates. Heat exchanging channels are provided for temperature control of the mixing channels to prevent undesirable condensation and reaction of the precursors.