Fluoropolymer-PFA Chamber Coating for Plasma Erosion Resistance

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Solution Overview

Problem

Plasma processing chambers in semiconductor manufacturing are susceptible to degradation due to exposure to halogen and oxygen plasmas, leading to rapid consumption and damage of components.

Innovation Solution

A semiconductor processing chamber component comprising an electrically conductive body with a low coefficient of thermal expansion (CTE) is coated with an intermediate fluoropolymer layer, followed by a perfluoroalkoxy alkane (PFA) layer to enhance resistance to plasma-induced erosion and corrosion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If components are used in plasma processing chambers, then semiconductor processing can be performed, but the components degrade rapidly due to halogen and oxygen plasma exposure

Engineering Contradiction:

Improvecomponent durabilityVSAvoidcomponent service life

Core Design Contradiction:

ReliabilityVSDuration of action of stationary object

Solution Approach 1:

The patent applies a multi-layer composite coating structure consisting of a fluoropolymer intermediate layer and a perfluoroalkoxy alkane (PFA) outer layer. This composite material system provides superior resistance to halogen and oxygen plasma exposure, preventing rapid degradation of the underlying conductive body while maintaining component functionality in the plasma processing environment.

Inventive Principle:

Principle #40Composite materials

2Productivity

If components are exposed to halogen and oxygen plasmas, then semiconductor processing functions are achieved, but component consumption increases rapidly

Engineering Contradiction:

Improveprocessing capabilityVSAvoidcomponent consumption

Core Design Contradiction:

ProductivityVSLoss of substance

Solution Approach 1:

The patent employs a sacrificial coating layer strategy where the fluoropolymer and PFA layers are designed to protect the expensive conductive body from plasma-induced consumption. The coating layers can be replenished or replaced more easily than the main component, effectively managing material loss while maintaining continuous processing capability.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Productivity

If components are exposed to plasma, then semiconductor manufacturing processes proceed, but contamination occurs

Engineering Contradiction:

Improveprocessing continuityVSAvoidcontamination

Core Design Contradiction:

ProductivityVSObject-generated harmful factors

Solution Approach 1:

The perfluoroalkoxy alkane (PFA) outer layer and fluoropolymer intermediate layer create a chemically inert barrier between the conductive body and the reactive plasma environment. This inert coating system prevents plasma species from interacting with and contaminating the underlying component, maintaining processing continuity without introducing harmful contaminants.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 component exhibits improved durability and reduced consumption, maintaining consistent performance and minimizing contamination in plasma processing environments.

Implementation Method 1

A perfluoroalkoxy alkane (PFA) layer is disposed over the intermediate layer to form the component

Methodology Applied

Scientific EffectChemical inertness:

Implementation Method 2

An intermediate layer is disposed over at least one surface of the body, the intermediate layer comprising a fluoropolymer

Methodology Applied

Scientific EffectProtective coating barrier: Coatings

Data Source

PatentUS12548737B2Polymeric coating for semiconductor processing chamber components

Publication Date: 2026.02.10 LAM RES CORP

AI summary

A component in a semiconductor processing chamber is provided. An electrically conductive semiconductor or metal body has a CTE of less than 10.0×10−6/K. An intermediate layer is disposed over at least one surface of the body, the intermediate layer comprising a fluoropolymer. A perfluoroalkoxy alkane (PFA) layer is disposed over the intermediate layer to form the component.