In-situ Particle Detection for Semiconductor Substrate Processing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional particle detection methods in semiconductor manufacturing factories are limited to when the factory interface is open for maintenance, leading to infrequent detection and prolonged system downtime for troubleshooting, making it difficult to identify and address particle contamination sources efficiently.
Innovation Solution
Incorporating an in-situ particle detector within the factory interface that creates laminar flow using a fan, substrate support, and exhaust outlet, allowing continuous monitoring of particle concentration and combining data with other sensors to identify contamination sources, and potentially integrating the detector into other system components like load-lock or buffer chambers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a handheld particle detection device is used, then particle detection can be performed during maintenance, but detection frequency is low and system downtime is prolonged
Solution Approach 1:
The patent replaces the mechanical handheld detection device with an automated in-situ particle detection system that uses optical fields (laser scattering) to detect particles continuously within the factory interface, eliminating the need for manual intervention and system shutdowns
Solution Approach 2:
The patent implements continuous particle detection by positioning the detector within the factory interface to monitor particles in real-time as substrates are transferred, replacing the intermittent manual detection approach and enabling ongoing contamination monitoring without interrupting substrate processing
2Reliability
If handheld particle detection is used during maintenance, then particle contamination can be detected, but troubleshooting time is extended and contamination sources cannot be identified efficiently
Solution Approach 1:
The patent implements a feedback system where the in-situ particle detector continuously monitors particle concentrations and provides real-time data to operators, enabling immediate identification of contamination sources and rapid troubleshooting without extended system downtime
Solution Approach 2:
The patent introduces an intermediary particle detection system positioned within the factory interface that acts as a mediator between the substrate transfer process and contamination monitoring, providing continuous data about particle sources without requiring manual intervention or system shutdowns
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 reduces system downtime and enhances troubleshooting efficiency by providing continuous particle monitoring and data integration, leading to increased process yield and decreased substrate scrap rates.
Implementation Method 1
the fan directs air towards the exhaust outlet and over a substrate on the substrate support to create laminar flow
Implementation Method 2
The particle detector, positioned downstream from the substrate support and upstream from the exhaust outlet, analyzes the air and detects particle concentration
Data Source
AI summary
An FI having an in-situ particle detector and a method for particle detection therein are provided. In one aspect, the FI includes a fan, a substrate support, a particle detector, and an exhaust outlet. The fan, substrate support, and particle detector are arranged such that, in operation, the fan directs air towards the exhaust outlet and over a substrate on the substrate support to create laminar flow. The particle detector, positioned downstream from the substrate support and upstream from the exhaust outlet, analyzes the air and detects particle concentration before the particles are exhausted. The collected particle detection data may be combined with data from other sensors in the FI and used to identify the source of particle contamination. The particle detector may also be incorporated into other system components, including but not limited to, a load-lock or buffer chamber to detect particle concentration therein.