Vertical Wafer Mounting to Reduce Etch Vibration Defects

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Solution Overview

Problem

Existing plasma etching processes face challenges with wafer vibrations due to electromagnetic fields, pressure imbalances, and mechanical equipment, affecting feature resolution and uniformity, while conventional solutions for vibration control compromise etch process efficacy or increase spatial footprint.

Innovation Solution

A vertically mounted processing system with a flip assembly and rotary drives is used to orient wafers vertically, directing vibrations along the vertical direction and minimizing spatial footprint, reducing vibrations and preventing material accumulation in features.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If wafers are processed in conventional horizontal orientation, then material can be deposited on wafer surface, but vibrations from electromagnetic fields and mechanical equipment adversely affect feature resolution and uniformity

Engineering Contradiction:

Improvefeature resolution and uniformityVSAvoidwafer vibrations

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

The patent inverts the conventional horizontal wafer processing orientation to a vertical orientation. By mounting the wafer holder vertically and directing the material flux horizontally onto the wafer surface, the system changes the direction in which vibrations affect the wafer. This inversion allows vibrations to occur along the vertical axis rather than horizontally across the wafer surface, thereby preserving feature resolution and uniformity while maintaining the deposition function.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent transitions from a two-dimensional horizontal processing plane to a three-dimensional vertical configuration. The wafer is mounted vertically with its surface normal aligned along the horizontal axis, while the material flux is directed horizontally onto the wafer. This dimensional change separates the vibration direction (vertical) from the processing plane (horizontal), allowing high-precision patterning to proceed without vibration-induced defects.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Manufacturing precision

If vibration control measures are implemented, then feature resolution improves, but etch process efficacy is compromised or spatial footprint increases

Engineering Contradiction:

Improvefeature resolutionVSAvoidetch process efficacy

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

Rather than adding complex vibration damping mechanisms that could interfere with the etch process, the patent inverts the processing orientation to vertically mount the wafer. This geometric solution naturally directs vibrations away from the wafer surface in a direction perpendicular to the material flux, achieving vibration control without compromising etch efficacy or requiring additional space.

Inventive Principle:

Principle #13The other way round (Inversion)

3Reliability

If conventional horizontal wafer processing is used, then material flux can be directed onto wafer, but material accumulates in features causing defects

Engineering Contradiction:

Improvedefect reductionVSAvoidmaterial accumulation in features

Core Design Contradiction:

ReliabilityVSObject-generated harmful factors

Solution Approach 1:

The patent inverts the conventional configuration by mounting the wafer vertically and directing material flux horizontally onto the wafer surface. This orientation causes material to be deposited from the side rather than from above, preventing accumulation in trenches and holes. The horizontal flux direction allows material to be swept across the wafer surface without pooling in vertical features, significantly reducing deposition-related defects.

Inventive Principle:

Principle #13The other way round (Inversion)

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 system effectively mitigates vibrations, reduces spatial footprint, and enhances processing efficiency by allowing precise scanning and minimizing defects, while maintaining etch process performance and reducing maintenance needs.

Implementation Method 1

a rotary bar coupled to a rotary drive... transferring the wafer from the flip assembly to a wafer holder... such that the wafer is disposed along a second orientation in the processing chamber, the second orientation being angled to the first orientation

Methodology Applied

Scientific EffectMechanical rotation:

Implementation Method 2

Plasma etching is a widely employed process in the fabrication of integrated circuits (ICs), where selective areas of materials are removed from the surface of a semiconductor wafer using plasma-generated reactive species

Methodology Applied

Scientific EffectPlasma etching: Plasma

Data Source

PatentUS20260058109A1Vertically mounted processing system

Publication Date: 2026.02.26 TOKYO ELECTRON LTD

AI summary

A method for processing a wafer includes receiving the wafer on a flip assembly disposed in a processing chamber, the wafer being received in a first orientation parallel to a floor of the processing chamber, the flip assembly including a rotary bar coupled to a rotary drive. The method further includes transferring the wafer from the flip assembly to a wafer holder disposed in the processing chamber such that the wafer is disposed along a second orientation in the processing chamber, the second orientation being angled to the first orientation, and exposing the wafer in the second orientation to a flux of material.