Chamber Lid Cooling for Semiconductor Reactors
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Solution Overview
Problem
Semiconductor processing systems with multiple reaction chambers face challenges in maintaining uniform temperature across the chamber lid, leading to hot spots and poor deposition results due to thermal connectivity between chambers.
Innovation Solution
A reactor system incorporating a cooling system that utilizes convective heat transfer with a finned heat sink and a fan assembly to direct cooling air onto the lid, creating a controlled air flow channel between showerheads to enhance temperature uniformity, including a variable speed motor and temperature sensor for adaptive cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple reaction chambers are integrated within a single housing sharing a common chamber lid, then space efficiency and processing throughput are improved, but temperature uniformity across the lid deteriorates due to thermal connectivity between chambers
Solution Approach 1:
The chamber lid is segmented into multiple independent cooling zones, each equipped with its own cooling channel and temperature control system. This allows each zone to be cooled independently, maintaining temperature uniformity across the lid despite the integrated multi-chamber configuration.
Solution Approach 2:
Different regions of the chamber lid are provided with differentiated cooling characteristics. Each cooling zone has tailored cooling parameters (flow rate, temperature) customized to its specific thermal requirements and position, ensuring uniform temperature distribution across the entire lid surface.
2Device complexity
If a single unitary lid is used to support multiple showerheads, then structural simplicity is improved, but temperature control precision deteriorates due to thermal coupling between chambers
Solution Approach 1:
The lid structure is segmented into multiple independent cooling zones while maintaining a single unitary lid body. Each zone has its own cooling channel system, enabling precise temperature control in each region without compromising structural simplicity.
Solution Approach 2:
Each cooling zone is equipped with local temperature sensors and controlled cooling parameters, allowing precise temperature control in each specific region. This localized control approach maintains overall structural simplicity while achieving high temperature control precision.
3Loss of energy
If cooling air is directed at high velocity onto the chamber lid, then cooling efficiency is improved, but energy consumption increases due to the fan assembly operating at high power
Solution Approach 1:
The fan assembly operates with variable speed capability, allowing the cooling air flow rate to be dynamically adjusted based on real-time temperature feedback from sensors. This dynamic control optimizes cooling efficiency while minimizing energy consumption by using only the necessary fan power required at each moment.
Solution Approach 2:
Temperature sensors monitor the lid temperature in each cooling zone and provide feedback to the control system, which adjusts fan speed accordingly. This closed-loop feedback mechanism ensures optimal energy usage by increasing fan power only when and where temperature exceeds the desired range.
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 system effectively reduces temperature non-uniformity on the chamber lid, preventing hot spots and improving deposition quality by actively managing heat distribution across the lid surface.
Implementation Method 1
the cooling system is adapted to utilize convective heat transfer and includes a finned heat sink positioned at the center of the chamber lid
Implementation Method 2
a finned heat sink positioned at the center of the chamber lid in the center space between the external portions of the showerheads
Implementation Method 3
a cooling fan positioned to have its outlet at the center space and over the finned heat sink so that air out of (or cooling air) is directed into the center space and onto the heat sink
Data Source
AI summary
A reactor system for use in semiconductor processing, such as for chemical vapor deposition (CVD), atomic layer deposition (ALD), and other deposition steps, that makes use of a reactor module with two or more reaction chambers. The reactor system includes components of a cooling system to provide enhanced temperature uniformity across a chamber lid enclosing the housing or vessel containing the reaction chambers. In part, the cooling system is adapted to utilize convective heat transfer and includes a finned heat sink positioned at the center of the chamber lid in the center space between the external portions of the showerheads of the reaction chambers. Further, the cooling system includes a fan positioned to have its outlet at the center space and over the finned heat sink so that air is directed into the center space and onto the heat sink.