Semiconductor Baking Apparatus Thermal Management for Bubble Defect Reduction
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Solution Overview
Problem
Semiconductor baking apparatuses face challenges in removing organic particles and steam from low-temperature regions, leading to bubble defects on wafers during photolithography processes, which increase cycle time and affect circuit integrity.
Innovation Solution
The semiconductor baking apparatus includes a load lock chamber, process chamber, and transfer chamber with controlled temperature and gas flow management, where the first interior door is opened to allow heat transfer from the process chamber to the transfer chamber and load lock chamber when idle, reducing organic particles and steam, and heating lamps maintain elevated temperatures to minimize defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the photoresist film is formed on the film for a longer coating time to decrease the bubble defects, then the bubble defects are reduced, but the cycle time of the photolithography process is increased
Solution Approach 1:
The patent applies preliminary action by heating the substrate before the photolithography coating process. The substrate is heated to a predetermined temperature (e.g., 60°C to 100°C) in advance using a heating apparatus, which prepares the surface to reduce organic particle attachment and steam adhesion during the subsequent coating process. This preliminary heating action prevents bubble defects without requiring longer coating time, thus resolving the contradiction between manufacturing precision and productivity
2Manufacturing precision
If the film is not smooth, organic particles and/or steam may be attached onto the film, but increasing coating time to prevent attachment increases cycle time
Solution Approach 1:
The patent applies parameter changes by modifying the temperature parameter of the substrate before coating. By heating the substrate to a specific temperature range (60°C to 100°C), the surface properties change to become less prone to organic particle and steam attachment. This parameter change (temperature increase) improves film smoothness and reduces the need for extended coating time, thereby addressing the contradiction between manufacturing precision and time loss
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 effectively decreases the attachment of organic particles and steam on wafers, reducing bubble defects and improving the uniformity of temperatures across chambers, thereby enhancing the smoothness of the wafer surface and reducing photolithography process cycle time.
Implementation Method 1
the process chamber is heated to a predetermined temperature
Implementation Method 2
heating lamps maintain elevated temperatures
Implementation Method 3
heat transfers from the process chamber to the transfer chamber
Data Source
AI summary
A semiconductor baking apparatus includes a load lock chamber, a process chamber, a transfer chamber, a first interior door, and a controller. The process chamber has a first accommodating space therein. The transfer chamber has a second accommodating space therein, and the transfer chamber is connected to the load lock chamber and the process chamber. The first interior door is between the process chamber and the transfer chamber. When the first interior door is opened, the first accommodating space is communicated with the second accommodating space. The controller is programmed to open the first interior door when the semiconductor baking apparatus idles.