Electrostatic Chuck Outer Ring for Edge Arcing Isolation

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Solution Overview

Problem

Existing electrostatic chuck assemblies in plasma processing chambers suffer from edge arcing issues due to plasma coupling, leading to substrate damage and processing defects, with existing coatings being easily damaged, eroded, and costly to refurbish.

Innovation Solution

A substrate support assembly with a blocking ring that forms a vacuum seal between the electrostatic chuck and cooling base, isolating the outer diameter and preventing arcing by maintaining the RF hot cooling base at atmospheric pressure.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If coatings are applied on the ESC periphery to mitigate edge arcing, then arcing is reduced, but the coatings are easily damaged, eroded, and expensive to refurbish

Engineering Contradiction:

Improvearc resistanceVSAvoidrefurbishment difficulty and cost

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The patent applies a sacrificial coating (e.g., alumina) on the ESC periphery that is designed to be consumed or eroded during plasma processing. This coating acts as a disposable protective layer that absorbs plasma damage, preventing arcing to the underlying ESC structure. When the coating deteriorates, it can be easily removed and reapplied, avoiding expensive refurbishment of the ESC itself.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The coating serves as an intermediary layer between the plasma environment and the ESC periphery. It mediates the interaction by providing a controlled erosion path that protects the expensive ESC components from direct plasma exposure and arcing, while allowing the system to maintain reliability over extended periods.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If the ESC periphery is exposed to plasma, then processing continues, but edge arcing occurs causing substrate damage and processing defects

Engineering Contradiction:

Improveprocessing continuityVSAvoidedge arcing

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent converts the harmful plasma exposure at the ESC periphery into a beneficial protective mechanism by applying a sacrificial coating. The coating is intentionally designed to erode in a controlled manner, creating a protective effect that prevents harmful arcing. The erosion process itself becomes beneficial by maintaining a protective barrier between the plasma and the ESC structure.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The sacrificial coating provides preliminary protection against edge arcing before it can occur. By pre-applying this protective layer, the system prevents plasma from directly contacting the ESC periphery, thereby eliminating the conditions that would lead to arcing and substrate damage during processing.

Inventive Principle:

Principle #9Preliminary anti-action

3Ease of manufacture

If the adhesive layer between ESC and cooling base is exposed to plasma, then assembly is simple, but the adhesive erodes and causes reliability issues

Engineering Contradiction:

Improveassembly simplicityVSAvoidadhesive layer durability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The blocking ring acts as an intermediary protective structure that shields the adhesive layer from direct plasma exposure. It creates a physical barrier between the plasma environment and the adhesive bond line, preventing erosion while maintaining the simple adhesive assembly process. The blocking ring can be easily installed or removed without affecting the adhesive bonding process.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent segments the protective function from the bonding function by introducing a separate blocking ring component. This segmentation allows the adhesive layer to perform its bonding function simply and effectively, while the blocking ring independently provides plasma protection, preventing erosion of the adhesive.

Inventive Principle:

Principle #1Segmentation

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 blocking ring effectively mitigates arcing, protecting the adhesive layer and maintaining process performance by isolating the cooling base from plasma, reducing erosion and refurbishment costs.

Implementation Method 1

a blocking ring that forms a vacuum seal between the electrostatic chuck and cooling base, isolating the outer diameter

Methodology Applied

Scientific EffectVacuum seal: Vacuum

Implementation Method 2

preventing arcing by maintaining the RF hot cooling base at atmospheric pressure

Methodology Applied

Scientific EffectPressure isolation: Pressure Gradient

Data Source

PatentUS12562353B2Replaceable electrostatic chuck outer ring for edge arcing mitigation

Publication Date: 2026.02.24 APPLIED MATERIALS INC

AI summary

Embodiments of the present disclosure herein include an apparatus for processing a substrate. More specifically, embodiments of this disclosure provide a substrate support assembly that includes an electrostatic chuck (ESC) assembly. The ESC assembly comprises a cooling base having a top surface and an outer diameter sidewall, an ESC having a substrate support surface, a bottom surface and an outer diameter sidewall, the bottom surface of the ESC coupled to the top surface of the cooling base by an adhesive layer. The substrate support assembly includes a blocking ring disposed around the outer diameter sidewalls of the cooling base and ESC, the blocking ring shielding an interface between the bottom surface of the ESC and the top surface of the cooling base.