Inert Gas Supply for STB in Semiconductor Wafer Production
Solution Overview
Problem
Semiconductor wafers are prone to contamination by oxygen or dust during process movement in semiconductor production, leading to low yield and efficiency issues.
Innovation Solution
A method for supplying inert gas, specifically nitrogen gas, to the Side Track Buffer (STB) system, which includes sensing FOUP loading, measuring gas pressure and flow, and controlling inert gas supply to prevent contamination, along with software management for adding or removing STBs without stopping the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If wafers are transported through STB during process movement, then space usability is improved and movement distance is shortened, but wafers are exposed to oxygen or dust causing contamination
Solution Approach 1:
The patent introduces an inert gas supply system that fills the STB chamber with inert gas (nitrogen or argon) to create a protected atmosphere during wafer transport. The inert gas supply unit connects to the STB and delivers inert gas when the STB is positioned at loading/unloading ports, preventing wafer exposure to oxygen and dust while maintaining the space-efficient ceiling-mounted STB configuration.
2Object-affected harmful factors
If inert gas is supplied to prevent contamination, then wafer protection is improved, but system complexity increases
Solution Approach 1:
The system automatically detects when the STB is positioned at a loading or unloading port using sensors that detect the presence of the STB. When the sensor detects the STB position, the control unit automatically activates the inert gas supply valve without requiring manual intervention. This self-service automation minimizes system complexity by eliminating the need for complex manual control interfaces while maintaining effective contamination protection.
3Adaptability or versatility
If STB is added or removed from the system, then system adaptability is improved, but system operation must be stopped
Solution Approach 1:
The STB system is designed as a modular, segmented structure where individual STB units can be independently added or removed from the ceiling-mounted rail system. Each STB operates as an independent module with its own inert gas supply connection, allowing flexible system configuration changes without affecting the operation of other STB units or requiring system shutdown.
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
Prevents contamination of semiconductor wafers during process movement, improving yield and allowing for increased productivity by maintaining system operation during STB additions or removals.
Implementation Method 1
supplying inert gas to an STB in a semiconductor wafer production system in which a wafer can be prevented from being contaminated from a source of contamination such as oxygen or dust
Data Source
AI summary
A method for supplying inert gas to a side track buffer (STB) in a semiconductor wafer production system includes a step of sensing that a front opening unified POD (FOUP) is loading on the STB and generating a first input signal, and a step of opening a valve for inert gas and supplying nitrogen gas to the FOUP based on the first input signal, and to a semiconductor wafer production system using the method.