Sliding Door for Semiconductor Drying Environment Airflow Control
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Solution Overview
Problem
In semiconductor processing, the open access between the factory interface and the drying environment allows high air flow, which interferes with the Marangoni drying process, leading to substrate defects and reducing the effectiveness of substrate drying.
Innovation Solution
A sliding door is positioned within the drying environment to block air flow from the factory interface when substrates are being dried, and is configured to move between open and closed positions to allow substrates to be transferred between the dryer and the factory interface while preventing air flow into the drying area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an open access is provided between the factory interface and the drying environment, then substrate transfer is facilitated, but high air flow enters the drying environment causing substrate defects
Solution Approach 1:
The drying environment is segmented from the factory interface using a door assembly, creating separate controlled zones. The door assembly includes a door body with a viewing window and heating element, allowing visual monitoring and thermal management while maintaining physical separation between the open factory interface and the controlled drying environment.
Solution Approach 2:
The door assembly acts as an intermediary element between the factory interface and drying environment. It includes a viewing window that allows optical communication (visual monitoring) and a heating element that provides thermal management, mediating the interaction between the two zones while preventing harmful air flow.
2Object-affected harmful factors
If a door is added to block air flow, then substrate defects are reduced, but device complexity increases
Solution Approach 1:
The door assembly serves multiple functions simultaneously: it blocks air flow to prevent substrate defects, provides a viewing window for visual monitoring, and includes a heating element for thermal management. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The viewing window and heating element are integrated into the door assembly structure. The viewing window is incorporated into the door body, and the heating element is built into the door assembly, merging multiple functions into a single integrated component rather than requiring separate devices.
3Stability of the object's composition
If the viewing window is heated, then condensation is prevented, but energy consumption increases
Solution Approach 1:
The heating element is activated in advance or continuously to maintain the viewing window temperature above the dew point, preventing condensation before it can form. This preliminary thermal conditioning ensures window clarity throughout the drying process.
Solution Approach 2:
The temperature of the viewing window is actively controlled and adjusted to maintain it above the dew point temperature. By changing the thermal parameter (temperature) of the window surface, condensation is prevented while minimizing energy consumption through targeted heating.
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 configuration reduces substrate defects by maintaining a controlled drying environment, enhancing the effectiveness of the Marangoni drying process and improving semiconductor device performance.
Implementation Method 1
The solvent vapor is absorbed along the surface of the fluid, with the concentration of the absorbed vapor causing the surface tension to be lower at the tip of the meniscus than in the bulk of the bath fluid, causing bath fluid to flow from the drying meniscus toward the bulk bath fluid. Such a flow is known as 'Marangoni flow'
Implementation Method 2
A heating element within the door assembly may be employed to prevent condensation of water vapor on the viewing window
Data Source
AI summary
One or more embodiments described herein generally relate to drying environments within semiconductor processing systems. In these embodiments, substrates are cleaned and dried within a drying environment before returning to the factory interface. However, due to an opening between the factory interface and the drying environment, air flows from the factory interface into the drying environment, often reducing the effectiveness of the drying processes. In embodiments described herein, the air flow is blocked by a sliding door that raises up to the closed position when a substrate enters the drying portion of the dryer located within the drying environment. After the substrate exits the dryer and before the substrate enters the factory interface, the sliding door lowers to the opened position such that the substrate can enter the factory interface. As such, these processes allow for multiple substrates to dry quickly and consistently within the system, improving throughput.