Semiconductor Substrate Cooling Station for Condensation Control
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Solution Overview
Problem
Semiconductor fabrication processes are susceptible to defects caused by contaminants introduced during substrate handling, particularly when transferring between process chambers and substrate carriers, which contaminating sterile environments and the semiconductor substrates.
Innovation Solution
A cooling station is introduced before transferring semiconductor substrates to a substrate carrier, using cooling gas to reduce condensation and outgas volatile components, enhancing throughput and reducing defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If semiconductor substrates are transferred directly from process chambers to substrate carriers, then handling time is reduced, but condensation forms on substrates causing defects
Solution Approach 1:
The cooling station performs preliminary cooling of substrates immediately after they exit the process chamber, before they are transferred to substrate carriers. This preliminary action prevents condensation from forming during subsequent handling and storage, eliminating the need for delayed transfers or special protective measures.
2Manufacturing precision
If substrates are cooled in a sterile environment, then condensation is reduced, but the complexity of the handling system increases
Solution Approach 1:
The handling system is segmented into distinct functional zones: a process chamber zone, a cooling station zone with controlled atmosphere, and a substrate carrier zone. The cooling station acts as an independent intermediate chamber that can be separately controlled and maintained, allowing the sterile environment requirements to be localized rather than applied to the entire handling system.
3Manufacturing precision
If cooling gas is introduced to reduce condensation, then substrate quality improves, but outgassing of volatile components occurs
Solution Approach 1:
The cooling station serves as an intermediary chamber between the process chamber and substrate carriers. It introduces cooling gas to prevent condensation while providing a controlled environment that captures and contains volatile outgassing components. The station's design allows harmful outgassed components to be managed separately from the substrate cooling function, resolving the contradiction between condensation prevention and outgassing control.
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 cooling station effectively reduces condensation and outgassing, increasing fabrication efficiency and yield by minimizing defects in subsequent processing operations.
Implementation Method 1
cooling the semiconductor substrate in the presence of the cooling gas in the cooling station prior to transferring the semiconductor substrate to the substrate carrier reduces condensation of material, such as water, on surfaces of the semiconductor substrate
Implementation Method 2
The provision of the semiconductor substrates in the cooling station also facilitates outgassing of volatile components from the surfaces of the semiconductor substrate
Data Source
AI summary
A process tool for handling a semiconductor substrate as part of a semiconductor fabrication process includes a cooling station and a transport system, such as a front-end robot, for positioning the semiconductor substrate in the cooling station during a cooling operation. A method for handling the semiconductor substrate uses the transport system for positioning the semiconductor substrate in the cooling station during the cooling operation.