Concentric Showerhead Gas Manifold for CVD

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Solution Overview

Problem

Current chemical vapor deposition (CVD) reactor designs face challenges in maintaining contamination prevention, gas isolation, and efficient gas flow management, particularly in preventing back diffusion and mixing between deposition zones, which affects the quality and consistency of epitaxial film deposition.

Innovation Solution

A concentric gas manifold assembly is introduced, comprising upper, middle, and lower sections with independent gas flow paths, utilizing materials like molybdenum and stainless steel, to manage gas flow and prevent contamination by isolating zones and using inert gases as isolation curtains, ensuring precise delivery of process gases to the substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple process gases are delivered simultaneously to the substrate, then deposition efficiency is improved, but gas mixing and contamination occur

Engineering Contradiction:

Improvedeposition efficiencyVSAvoidgas mixing and contamination

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The gas delivery system is segmented into multiple independent flow paths (first process gas flow path and second process gas flow path) that are spatially separated. Each flow path delivers a different process gas to the substrate simultaneously without the gases mixing, thereby maintaining high deposition efficiency while preventing contamination.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The gas manifold assembly uses a nested structure where concentric tubes are positioned within each other. The first process gas flows through an inner tube while the second process gas flows through an outer annular region, creating nested flow paths that prevent gas mixing while enabling simultaneous delivery to the substrate.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Object-affected harmful factors

If gas flow paths are separated to prevent mixing, then contamination is prevented, but device complexity increases

Engineering Contradiction:

Improvecontamination preventionVSAvoidgas manifold structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The gas manifold assembly employs a nested configuration where concentric tubes are positioned within each other. The first process gas flows through an inner tube while the second process gas flows through an outer annular region, creating nested flow paths that prevent gas mixing while enabling simultaneous delivery to the substrate.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

Multiple gas flow paths are merged into a single integrated manifold assembly. The first and second process gases are delivered through different regions of the same assembly, combining the functions of multiple separate gas delivery systems into one unified structure, thereby reducing overall system complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If inert gases are used as isolation curtains, then zone isolation is improved, but gas consumption increases

Engineering Contradiction:

Improvezone isolationVSAvoidinert gas consumption

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The inert gas isolation curtains are extracted and positioned only at critical interfaces between different process zones. Rather than filling entire zones with inert gas, the system uses targeted inert gas flow paths at boundaries where contamination prevention is most critical, reducing overall inert gas consumption while maintaining effective zone isolation.

Inventive Principle:

Principle #2Taking out (Extraction)

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 concentric gas manifold assembly enhances the quality and consistency of epitaxial film deposition by preventing contamination and gas mixing, allowing for simultaneous delivery of chemically reactive gases without mixing, thereby improving the throughput and quality of deposited materials.

Implementation Method 1

Chemical vapor deposition ('CVD') is the deposition of a thin film on a substrate by the reaction of vapor phase chemicals

Methodology Applied

Scientific EffectVapor phase chemical reaction: Chemical Vapour Deposition

Implementation Method 2

preventing back diffusion and mixing between deposition zones

Methodology Applied

Scientific EffectDiffusion barrier: Diffusion Barrier

Data Source

PatentUS9121096B2Concentric showerhead for vapor deposition

Publication Date: 2015.09.01 UTICA LEASECO LLC

AI summary

Embodiments of the invention generally relate to a concentric gas manifold assembly used in deposition reactor or system during a vapor deposition process. In one embodiment, the manifold assembly has an upper section coupled to a middle section coupled to a lower section. The middle section contains an inlet, a manifold extending from the inlet to a passageway, and a tube extending along a central axis and containing a channel along the central axis and in fluid communication with the passageway. The lower section of the manifold assembly contains a second manifold extending from a second inlet to a second passageway and an opening concentric with the central axis. The tube extends to the opening to form a second channel between the tube and an edge of the opening. The second channel is concentric with the central axis and is in fluid communication with the second passageway.