Atomic Layer Deposition Gas Flow Control for High-Throughput Coating

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Solution Overview

Problem

Existing atomic layer deposition (ALD) apparatuses face a trade-off between throughput and coating quality, with increased throughput leading to deteriorated coating quality due to precursor gas flow disturbances and gas phase reactions, and high coating quality requiring lower throughput.

Innovation Solution

An ALD apparatus with a substrate support and precursor supply head arrangement that includes a suction zone to control precursor flow and a discharge connection for underpressure, maintaining a uniform reaction gap and preventing gas mixing, allowing high-speed rotation without substrate detachment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the rotating speed of the substrate support is increased to increase throughput, then the processing speed is improved, but the coating quality deteriorates due to precursor gas flow disturbances and gas phase reactions

Engineering Contradiction:

ImprovethroughputVSAvoidcoating quality

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

A gas distribution element is introduced as an intermediary component between the precursor supply and the substrate. This element distributes the precursor gas in a controlled manner, preventing gas phase reactions and maintaining coating quality even at high rotation speeds. The gas distribution element acts as a mediator that manages the precursor flow to eliminate harmful gas phase reactions while allowing high throughput operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If a powerful suction or discharge flow is arranged to the reaction chamber to prevent gas phase precursor reactions, then gas phase reactions are prevented, but the precursor flow is disturbed

Engineering Contradiction:

Improvecoating qualityVSAvoidprecursor flow disturbance

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The gas distribution element serves as an intermediary that distributes precursor gas uniformly across the substrate surface without requiring powerful suction flows. This controlled distribution prevents gas phase reactions while maintaining stable precursor flow, eliminating the need for strong discharge flows that would otherwise disturb the precursor supply.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If the precursor supply head is moved or removed during substrate loading and unloading, then substrate handling is enabled, but the operation becomes complicated and time consuming

Engineering Contradiction:

Improvesubstrate handlingVSAvoidloading and unloading time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The gas distribution element is divided into multiple separate elements that can be independently positioned. During substrate loading and unloading, only the necessary gas distribution elements remain in place while others can be removed or repositioned. This segmentation enables efficient substrate handling without requiring movement of the entire precursor supply head assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of moving the precursor supply head during substrate loading/unloading, the system allows the substrate support to rotate continuously while selectively positioning gas distribution elements. The precursor supply remains stationary while the substrate and selected gas distribution elements rotate into position, inverting the conventional approach and eliminating time-consuming precursor head movements.

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

Enhances coating quality while maintaining high throughput by controlling precursor distribution and substrate retention, preventing gas phase reactions, and enabling efficient substrate handling.

Implementation Method 1

Gas flow from the reaction zone or the precursor nozzle tends to start following the rotating movement of the substrate support or the rotating substrate support drags the precursor along. Accordingly, the precursor material escapes from the reaction zone.

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

Gas phase precursor reaction may occur instead of surface reaction on the surface of the substrate. The gas phase precursor reactions are prevented by arranging a very powerful suction or discharge flow to the reaction chamber.

Methodology Applied

Scientific EffectVacuum: Vacuum

Implementation Method 3

The substrate support is rotated around a rotating axis which is perpendicular to the support surface. When the substrate support is rotated, the one or more substrates move successively and repeatedly under the one or more reaction zone or precursor nozzles thus subjecting the surface if the substrate to precursors.

Methodology Applied

Scientific EffectRotational motion:

Data Source

PatentUS12460292B2Atomic layer deposition apparatus and a method

Publication Date: 2025.11.04 BENEQ OY

AI summary

An atomic layer deposition apparatus includes a substrate support having a support surface, a precursor supply head having an output face, and a rotating mechanism arranged to rotate the substrate support and the precursor supply head relative to each other. The apparatus further includes a process chamber provided with a discharge connection for discharging gases from the process chamber.