FinFET Coating Height Equalization Under Deposition Loading

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Solution Overview

Problem

The semiconductor industry faces challenges with loading effects during the deposition of coating layers on FinFET devices, leading to height discrepancies between different regions, which can result in device defects, yield reduction, and sublayer damage.

Innovation Solution

A method is employed where a coating layer is initially deposited under loading conditions, resulting in varying heights across different regions. A processing gas is then applied to remove the upper portion of the coating layer, ensuring that the height of the coating layer is uniform across all regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a coating layer is deposited under loading conditions, then the coating layer can be formed on the FinFET device, but height discrepancies occur between different regions leading to device defects

Engineering Contradiction:

Improvecoating layer depositionVSAvoidcoating layer height uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The patent applies a processing gas to the coating layer before final deposition or formation to pre-condition the surface and eliminate loading effects. This preliminary action prevents height discrepancies from occurring in the first place, ensuring uniform coating formation across different regions of the FinFET device

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent utilizes the loading condition itself as a beneficial factor by applying a processing gas that selectively removes material from regions that would otherwise receive excessive coating. The harmful loading effect is converted into a controlled etching process that achieves the desired uniform height

Inventive Principle:

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

2Ease of manufacture

If a coating layer is deposited under loading conditions, then the coating layer can be formed on the FinFET device, but sublayer damage occurs

Engineering Contradiction:

Improvecoating layer depositionVSAvoidsublayer damage

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The patent converts the potentially damaging loading condition into a beneficial etching process. By applying a processing gas under controlled conditions, the excessive coating material is removed in a controlled manner that prevents sublayer damage while achieving uniform coating height

Inventive Principle:

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

Solution Approach 2:

The patent changes the parameters of the deposition process by introducing a processing gas that alters the net material transfer. This parameter change transforms the deposition process into a balanced process where deposition and etching occur simultaneously, preventing both over-deposition and sublayer damage

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If a coating layer is deposited under loading conditions, then the coating layer can be formed on the FinFET device, but yield reduction occurs

Engineering Contradiction:

Improvecoating layer depositionVSAvoiddevice yield

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent applies a processing gas to the coating layer as a preliminary step before final device completion. This preliminary action eliminates loading-related defects that would otherwise cause yield reduction, ensuring all devices meet specifications

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent converts the harmful loading effect into a yield-enhancing process by using the processing gas to uniformly condition the coating layer. This transforms a defect-causing process into a quality-improving step that increases overall device yield

Inventive Principle:

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

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 approach effectively eliminates loading-related issues, reducing device defects, enhancing yield, and minimizing damage to sublayers by ensuring consistent coating heights across all regions of the FinFET device.

Implementation Method 1

A processing gas is applied to the coating layer to remove an upper portion of the coating layer

Methodology Applied

Scientific EffectEtching:

Data Source

PatentUS12302596B2Fin field-effect transistor and method of forming the same

Publication Date: 2025.05.13 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

A method includes fabricating a semiconductor device, wherein the method includes depositing a coating layer on a first region and a second region under a loading condition such that a height of the coating layer in the first region is greater than a height of the coating layer in the second region. The method also includes applying processing gas to the coating layer to remove an upper portion of the coating layer such that a height of the coating layer in the first region is a same as a height of the coating layer in the second region.