Semiconductor Chamber Pressure Gradient for Contamination Control

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Solution Overview

Problem

In semiconductor processing, contamination of workpieces due to particulates generated during the movement of a workpiece support between the reaction chamber and the loading chamber poses a challenge, leading to device failure and reduced quality.

Innovation Solution

A semiconductor processing apparatus with a cross-flow reaction chamber and a movable workpiece support that maintains a higher pressure in the reaction chamber than the loading chamber during movement and processing, creating a positive pressure gradient to prevent particle contamination, and switches to a negative pressure gradient during processing to prevent gas leakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the workpiece support moves between the reaction chamber and loading chamber, then workpiece processing can be performed, but particulate contamination occurs due to particles generated during movement

Engineering Contradiction:

Improveworkpiece processing capabilityVSAvoidparticulate contamination

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent utilizes the harmful particles generated during workpiece support movement by directing them away from the reaction chamber through controlled pressure gradients. The particles are intentionally channeled into the loading chamber where they cannot contaminate the workpiece, converting a harmful byproduct into a controlled flow pattern that protects the processing environment.

Inventive Principle:

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

Solution Approach 2:

The patent dynamically changes pressure parameters between the reaction chamber and loading chamber during different phases of operation. By adjusting pressure differentials, the system controls particle flow directions to prevent contamination during movement while maintaining proper processing conditions when the workpiece is stationary in the reaction chamber.

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If the reaction chamber is isolated from the exterior, then contamination is prevented, but pressure control during workpiece movement becomes challenging

Engineering Contradiction:

Improvecontamination preventionVSAvoidpressure control system

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent implements dynamic pressure control that adapts to different operational phases. The pressure gradient system transitions between different pressure configurations depending on whether the workpiece support is moving or stationary, allowing the isolated reaction chamber to maintain contamination prevention while accommodating the complexities of workpiece movement through adaptive pressure management.

Inventive Principle:

Principle #15Dynamics

3Reliability

If a seal is created between the workpiece support and baseplate opening, then gas leakage is prevented, but particle contamination may occur during sealing

Engineering Contradiction:

Improvegas leakage preventionVSAvoidparticle contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies preliminary pressure gradient control before the workpiece support engages with the baseplate opening. By establishing the appropriate pressure differential in advance, the system ensures that particles are directed away from the reaction chamber before sealing occurs, preventing contamination while maintaining reliable gas leakage prevention through proper sealing.

Inventive Principle:

Principle #10Preliminary action

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

This solution effectively reduces workpiece contamination by directing particles away from the reaction chamber during support movement and ensures controlled gas flow during processing, enhancing the quality and yield of semiconductor devices.

Implementation Method 1

Higher pressure is maintained in the reaction chamber than in the loading chamber while the workpiece support is moving

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

processing comprises flowing a reaction gas approximately parallel to a face of the workpiece

Methodology Applied

Scientific EffectLaminar flow: Laminar Flow

Data Source

PatentUS8759226B2Method for minimizing contamination in semiconductor processing chamber

Publication Date: 2014.06.24 ASM IP HLDG BV

AI summary

A semiconductor processing apparatus includes a reaction chamber, a loading chamber, a movable support, a drive mechanism, and a control system. The reaction chamber includes a baseplate. The baseplate includes an opening. The movable support is configured to hold a workpiece. The drive mechanism is configured to move a workpiece held on the support towards the opening of the baseplate into a processing position. The control system is configured to create a positive pressure gradient between the reaction chamber and the loading chamber while the workpiece support is in motion. Purge gases flow from the reaction chamber into the loading chamber while the workpiece support is in motion. The control system is configured to create a negative pressure gradient between the reaction chamber and the loading chamber while the workpiece is being processed. Purge gases can flow from the loading chamber into the reaction chamber while the workpiece support is in the processing position, unless the reaction chamber is sealed from the loading chamber in the processing position.