Textured Electrostatic Chuck Dielectric to Prevent Wafer Edge Arcing

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Solution Overview

Problem

Multipactor breakdown and substrate arcing occur due to local field enhancement at the junction between the substrate and the dielectric of the electrostatic chuck, creating a path for electrons to flow from the substrate to the baseplate, causing damage to RF components in substrate processing systems.

Innovation Solution

The dielectric plate of the electrostatic chuck is designed with features such as textured outer sidewalls, varying porosity, or coatings to disrupt the electron path, preventing secondary electron emission and multipactor breakdown.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a smooth dielectric plate is used in the electrostatic chuck, then the manufacturing process is simple, but local field enhancement occurs at the substrate-dielectric junction causing multipactor breakdown and substrate arcing

Engineering Contradiction:

Improvedielectric plate fabrication simplicityVSAvoidRF component reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The dielectric plate is designed with different surface characteristics at different locations: the central region maintains a smooth surface for proper substrate contact, while the peripheral region incorporates textured surfaces or asperities. This local differentiation prevents field enhancement at the substrate-dielectric junction without compromising the overall manufacturing process

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

A textured dielectric layer is introduced as an intermediary between the substrate and the baseplate. This intermediate layer with controlled surface roughness or porosity disrupts the electron path and prevents secondary electron emission, thereby eliminating multipactor breakdown while maintaining the simplicity of the overall structure

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the dielectric plate has a uniform structure throughout, then the manufacturing process is simplified, but electron flow paths are not disrupted allowing multipactor breakdown to occur

Engineering Contradiction:

Improvedielectric plate structure complexityVSAvoidmultipactor breakdown

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The dielectric plate transitions from a uniform structure to a non-uniform structure with localized texturing or porosity variations in the peripheral region. This local structural modification disrupts electron flow paths and prevents multipactor breakdown while minimizing the overall structural complexity

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The dielectric plate incorporates porous regions with controlled porosity in the peripheral area. These porous structures effectively disrupt electron trajectories and prevent secondary electron emission, reducing multipactor breakdown without significantly complicating the manufacturing process

Inventive Principle:

Principle #31Porous materials

3Ease of manufacture

If the outer sidewall of the dielectric plate is smooth, then manufacturing is easier, but electron multiplication occurs causing damage to RF components

Engineering Contradiction:

Improveouter sidewall fabricationVSAvoidelectron multiplication

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The outer sidewall of the dielectric plate is designed with localized texturing or asperities in specific regions. This local surface modification disrupts electron multiplication paths while maintaining relative manufacturing simplicity compared to completely rough surfaces

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The dielectric plate incorporates curved or rounded features on the outer sidewall rather than sharp edges or completely flat surfaces. This curvature helps distribute electric fields more evenly and reduces electron multiplication, while still being manufacturable with standard processes

Inventive Principle:

Principle #14Spheroidality (Curvature)

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 reduces or prevents multipactor breakdown by disrupting the electron flow path, thereby protecting RF components and enhancing the reliability of substrate processing.

Implementation Method 1

A multipactor breakdown occurs when electrons accelerated by RF fields are self-sustained in a vacuum (or near vacuum) via an electron avalanche caused by multiplication of secondary electron emission

Methodology Applied

Scientific EffectSecondary electron emission:

Implementation Method 2

Methodology Applied

Scientific EffectElectron avalanche: Electron Avalanche

Data Source

PatentUS12469733B2Wafer to baseplate arc prevention using textured dielectric

Publication Date: 2025.11.11 APPLIED MATERIALS INC

AI summary

Electrostatic chucks for use in substrate processing chambers are provided herein. In some embodiments, an electrostatic chuck for use in a substrate processing chamber includes: a dielectric plate having an electrode disposed therein, the dielectric plate further including a central portion and a peripheral portion, wherein the peripheral portion comprises at least one of: an outer sidewall having at least one asperity; a porosity greater than a porosity of the central portion of the dielectric plate; or one or more coatings made of a material different than a material of the central portion.