EFEM Deflector Structure for FOUP Humidity Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Semiconductor wafers in FOUPs are exposed to high relative humidity when opened at EFEMs, leading to issues like copper oxidation due to the higher humidity of the EFEM environment, despite purging processes.

Innovation Solution

A deflector is installed within the EFEM housing to divert laminar air flow away from the load port, maintaining laminarity and reducing humidity exposure to the FOUP.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the FOUP is opened at the EFEM for wafer transfer, then wafer access and processing efficiency are improved, but the FOUP interior is exposed to high humidity environment causing copper oxidation

Engineering Contradiction:

Improvewafer transfer efficiencyVSAvoidhumidity exposure

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

A deflector is introduced as an intermediary component between the EFEM laminar flow and the FOUP interior. The deflector redirects the high-humidity laminar air flow away from the FOUP opening, preventing direct exposure while allowing the FOUP to remain accessible for wafer transfer operations

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent applies local quality by creating a differentiated humidity environment: the FOUP interior maintains low humidity conditions while the exterior operates in the EFEM's high-humidity laminar flow environment. The deflector creates a localized protective zone at the FOUP opening

Inventive Principle:

Principle #3Local quality

2Reliability

If purging processes are used to maintain low humidity in FOUP, then oxidation prevention is improved, but the complexity of the system increases

Engineering Contradiction:

Improveoxidation preventionVSAvoidpurge system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent extracts the humidity control function from the complex active purging system and replaces it with a passive deflector mechanism. The deflector physically redirects the laminar flow away from the FOUP, eliminating the need for continuous active purging while maintaining low humidity conditions

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The deflector creates a self-regulating system where the EFEM's own laminar flow, when redirected by the deflector, automatically provides humidity protection to the FOUP interior without requiring additional energy input or complex control systems

Inventive Principle:

Principle #25Self-service

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 deflector effectively maintains low relative humidity within the FOUP, preventing undesirable oxidation and ensuring a secure environment for semiconductor wafers during processing.

Implementation Method 1

A deflector is installed within the EFEM housing to divert laminar air flow away from the load port, maintaining laminarity and reducing humidity exposure to the FOUP

Methodology Applied

Scientific EffectLaminar flow: Laminar Flow

Data Source

PatentUS20250323079A1Systems and methods for humidity control of FOUP during semiconductor fabrication

Publication Date: 2025.10.16 TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

AI summary

The present disclosure relates to systems and methods for reducing the humidity within a FOUP (Front Opening Unified Pod) when loaded on an EFEM (Equipment Front End Module) for transfer of a semiconductor wafer substrate during fabrication processes. A deflector of specified structure is placed inside the EFEM above the load port of the FOUP. The deflector directs airflow in the EFEM away from the load port. The deflector includes a body with a plurality of apertures in the deflector body, and with a sloped front surface. Thus, the degree of penetration of high-humidity air from the EFEM into the FOUP is reduced.