Movable Grounding Component for Plasma Chamber Mode Switching

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Solution Overview

Problem

Existing plasma processing chambers face challenges in reliably switching between RF-powered and grounded modes, leading to potential arcing issues that affect process consistency and maintenance requirements.

Innovation Solution

A movable grounding component, made of conductive material, is used to selectively couple or decouple the upper electrode to either RF energy or ground, allowing seamless switching between modes by physically separating or contacting RF and ground components to minimize arcing and enhance maintainability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a switching mechanism is designed to alternate between RF-powered mode and grounded mode, then the upper electrode can execute both operational modes, but arcing may occur during switching which detrimentally affects grounding and RF connection reliability

Engineering Contradiction:

Improvemode switching capabilityVSAvoidswitching mechanism reliability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A movable grounding component acts as an intermediary element that selectively couples or decouples the upper electrode to ground. This mediator component physically separates or contacts RF and ground components to minimize arcing during mode transitions, thereby resolving the contradiction between mode switching capability and switching reliability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The grounding component is designed to be movable rather than fixed, allowing it to dynamically change position to either contact or separate from the upper electrode. This dynamic configuration enables reliable switching between RF-powered and grounded modes by controlling the physical contact state, thus improving both adaptability and reliability

Inventive Principle:

Principle #15Dynamics

2Reliability

If the switching mechanism is made more robust to prevent arcing, then reliability improves, but device complexity increases

Engineering Contradiction:

Improveswitching mechanism reliabilityVSAvoidswitching mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The movable grounding component serves as a simple intermediary that provides robust switching through basic mechanical contact and separation. This approach achieves high reliability without requiring complex control systems or multiple components, as the grounding component itself performs the switching function through its movable nature

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The movable grounding component performs multiple functions: it provides grounding when contacted, enables RF operation when separated, and acts as the switching mechanism itself. This multi-functionality reduces overall device complexity by consolidating switching and grounding functions into a single component

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 provides a robust and reliable switching mechanism that reduces arcing, extends the operational life of the plasma processing system, and allows for efficient mode switching without compromising substrate processing, thereby improving process control and reducing maintenance needs.

Implementation Method 1

Methodology Applied

Scientific EffectPhysical contact and separation:

Data Source

PatentUS8847495B2Movable grounding arrangements in a plasma processing chamber and methods therefor

Publication Date: 2014.09.30 LAM RES CORP

AI summary

A plasma processing systems having at least one plasma processing chamber, comprising a movable grounding component, an RF contact component configured to receive RF energy from an RF source when the RF source provides the RF energy to the RF contact component, and a ground contact component coupled to ground. The plasma processing system further includes an actuator operatively coupled to the movable grounding component for disposing the movable grounding component in a first position and a second position. The first position represents a position whereby the movable grounding component is not in contact with at least one of the RF contact component and the ground contact component. The second position represents a position whereby the movable grounding component is in contact with both the RF contact component and the ground contact component.