Showerhead Shroud Faraday Cage RF Isolation

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Solution Overview

Problem

Radio frequency interference generated by showerheads in substrate processing systems is not effectively isolated, leading to noise that affects other components within the system.

Innovation Solution

A shroud enclosure configured as a Faraday cage is placed around the showerhead to contain and isolate RF interference, and a radio frequency filter module is used to filter RF noise from electrical signals, ensuring that the interference does not impact other processing chambers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the showerhead is used to supply gases in the substrate processing system, then the deposition and etching processes can be performed, but radio frequency interference is generated that affects other components

Engineering Contradiction:

Improvedeposition and etching process capabilityVSAvoidradio frequency interference

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The patent extracts the harmful RF interference from the showerhead system by enclosing it in a separate shroud structure. The shroud acts as an isolated containment space that separates the RF-generating components from the rest of the processing system, allowing the showerhead to continue its gas supply function while preventing RF interference from affecting other components.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The shroud enclosure serves as an intermediary barrier between the showerhead and other system components. It mediates the RF interference problem by providing a physical and electromagnetic boundary that allows the showerhead to operate normally while protecting surrounding components from harmful RF effects.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-generated harmful factors

If a shroud enclosure is added around the showerhead to isolate RF interference, then RF noise is effectively contained, but the device complexity increases

Engineering Contradiction:

ImproveRF interference isolationVSAvoidshroud enclosure structure

Core Design Contradiction:

Object-generated harmful factorsVSDevice complexity

Solution Approach 1:

The shroud enclosure is divided into multiple separate components including a base section, side walls, and a top section that can be assembled around the showerhead. This segmentation makes the complex shielding structure easier to manufacture, transport, and install while maintaining its RF isolation effectiveness.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The shroud enclosure utilizes thin-walled metallic structures that provide effective RF shielding without adding excessive weight or complexity. The thin-walled design maintains electromagnetic containment while being easier to manufacture and install compared to thick solid enclosures.

Inventive Principle:

Principle #30Flexible shells and thin films

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 effectively mitigates RF noise, preventing interference between components and ensuring stable operation of the substrate processing system by isolating RF interference and filtering noise from electrical signals.

Implementation Method 1

A shroud enclosure configured as a Faraday cage is placed around the showerhead to contain and isolate RF interference

Methodology Applied

Scientific EffectFaraday cage: Faraday Cage

Implementation Method 2

a radio frequency filter module is used to filter RF noise from electrical signals

Methodology Applied

Scientific EffectRadio frequency filtering: Filter (electronic)

Data Source

PatentUS11488810B2Showerhead shroud

Publication Date: 2022.11.01 LAM RES CORP

AI summary

A processing chamber includes an upper surface and a showerhead arranged to supply gases through the upper surface into the processing chamber. At least a portion of the showerhead extends above the upper surface of the processing chamber. A shroud enclosure is arranged on the upper surface of the processing chamber. The shroud enclosure is arranged around the portion of the showerhead extending above the upper surface of the processing chamber and is configured to isolate radio frequency interference generated by the showerhead.