Semiconductor Buffer Station Single Exit Flow Direction

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Solution Overview

Problem

Existing semiconductor processing buffers are prone to cross-flow gas contamination due to their open structure, which exposes wafers to ambient air, leading to chemical reactions with moisture and oxygen, damaging the wafers and buffer components.

Innovation Solution

A buffer design that encloses wafers on three sides with support fins extending from the back and side walls, featuring a cutout region for wafer handling and purge gas ports in the back wall to direct purge gas horizontally towards the opening, minimizing inter-wafer gas flow and contamination.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If wafers are stored in an open buffer structure, then wafer accessibility and simplicity of design are improved, but gas contamination and chemical reactions with ambient air increase

Engineering Contradiction:

Improvebuffer structureVSAvoidgas contamination

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent employs a buffer enclosure that seals the buffer interior from ambient air, creating a controlled atmosphere. This enclosure acts as a barrier that prevents gas contamination while maintaining wafer accessibility through the defined opening, directly resolving the contradiction between open structure benefits and contamination protection.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The patent introduces purge gas flow through the buffer interior to create an inert atmosphere that displaces ambient air. The purge gas flows from the opening toward the back wall, preventing chemical reactions between moisture/oxygen and wafer surfaces while maintaining the buffer's functional accessibility.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

2Manufacturing precision

If purge gas flows vertically through plates towards wafer mid-plane, then wafer surface coverage is improved, but inter-wafer gas flow and contamination increase

Engineering Contradiction:

Improvewafer surface coverageVSAvoidinter-wafer gas flow

Core Design Contradiction:

Manufacturing precisionVSObject-generated harmful factors

Solution Approach 1:

The patent inverts the traditional vertical purge gas flow direction by implementing horizontal flow from the opening toward the back wall. This reversal prevents purge gas from becoming trapped between wafers, eliminating inter-wafer contamination while still providing effective wafer surface coverage through the horizontal flow pattern.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent extracts the problematic vertical flow mechanism and replaces it with horizontal flow. By removing the vertical plate structure that caused inter-wafer trapping, the design achieves wafer surface coverage without generating harmful inter-wafer gas flow and contamination.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If buffer has multiple openings for wafer access, then wafer handling efficiency is improved, but gas contamination pathways increase

Engineering Contradiction:

Improvewafer handling efficiencyVSAvoidcontamination pathways

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a sealed buffer enclosure that limits gas exchange to a single defined opening. This enclosure maintains wafer handling efficiency through the opening while preventing multiple contamination pathways that would result from multiple openings, directly addressing the contradiction between accessibility and contamination protection.

Inventive Principle:

Principle #30Flexible shells and thin films

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 design significantly reduces gas contamination by ensuring purge gas flows primarily in a single direction, enhancing the purity of the environment and protecting wafers from ambient air, thereby preventing damage and improving processing efficiency.

Implementation Method 1

purge gas ports in the back wall to direct purge gas horizontally towards the opening, minimizing inter-wafer gas flow and contamination

Methodology Applied

Scientific EffectGas flow:

Data Source

PatentUS10297480B2Buffer station with single exit-flow direction

Publication Date: 2019.05.21 LAM RES CORP

AI summary

A buffer for use in semiconductor processing tools is disclosed. The buffer may be used to temporarily store wafers after processing operations are performed on those wafers. The buffer may include two side walls and a back wall interposed between the side walls. The side walls and the back wall may generally define an area within which the wafers may be stored in a stacked arrangement. Wafer support fins extending from the side walls and the back wall may extend into a wafer support region that overlaps with the edges of the wafers. Purge gas may be introduced in between each pair of wafers via purge gas ports located in one of the walls.