Semiconductor Chamber Wall Temperature Control
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Solution Overview
Problem
In semiconductor manufacturing, particles or byproducts deposited on chamber walls can affect the performance of semiconductor processes, leading to issues such as reduced wafer uniformity and contamination.
Innovation Solution
A semiconductor manufacturing system with a control device and heating element that adjusts the temperature of the chamber walls to prevent particle deposition by controlling the inlet valve and water flow, using a pulse width modulation signal to manage the heating element's output power, and incorporating a recycle pipe to conserve water and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If water flow is continuously maintained to prevent particle deposition on chamber walls, then manufacturing precision is improved, but loss of substance (water) increases
Solution Approach 1:
The system implements periodic water flow cycles alternating between high flow rate (during semiconductor processing) and low flow rate (during idle periods). The control device switches between these flow rates based on chamber activity detection, thereby maintaining particle prevention effectiveness while significantly reducing overall water consumption during non-processing times.
Solution Approach 2:
The water flow rate is dynamically adjusted based on real-time detection of chamber activity. The control device monitors whether the chamber is actively processing or idle, and automatically adjusts the water flow rate accordingly - high flow during processing to prevent particle deposition, low flow during idle periods to conserve water, thus adapting the system behavior to current operational needs.
2Reliability
If heating element operates continuously to maintain chamber wall temperature, then particle deposition is prevented, but use of energy increases
Solution Approach 1:
The heating element operates in periodic cycles rather than continuously. During active semiconductor processing, the heating element maintains elevated chamber wall temperatures to prevent particle deposition. During idle periods between processing cycles, the heating element reduces or stops operation, significantly reducing energy consumption while maintaining reliability during actual processing operations.
Solution Approach 2:
The heating element's power output is dynamically controlled based on chamber activity detection. The control device adjusts the heating element operation in real-time - full power during processing to ensure particle-free walls, reduced or zero power during idle periods to minimize energy consumption, thereby optimizing the balance between particle prevention reliability and energy usage.
3Manufacturing precision
If high water flow rate is maintained to prevent particle deposition, then manufacturing precision is improved, but use of energy increases
Solution Approach 1:
The water pump operates at high flow rate periodically during active processing to maintain particle-free chamber walls and ensure manufacturing precision. During idle periods between processing cycles, the pump operates at low flow rate or stops completely, significantly reducing the energy consumption of the water pump while maintaining precision during actual production operations.
Solution Approach 2:
The water pump's flow rate is dynamically adjusted based on real-time chamber activity detection. The control device monitors processing status and automatically varies the pump output - high flow rate during processing to prevent particle deposition and maintain wafer uniformity, low or zero flow rate during idle periods to minimize pump energy consumption, optimizing the trade-off between manufacturing precision and energy usage.
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
Prevents particle deposition on chamber walls, maintains wafer uniformity, conserves water, and reduces power consumption by optimizing water flow and heating element usage based on chamber activity.
Implementation Method 1
a heating element disposed in the inner space of the wall and configured to heat the wall
Implementation Method 2
When the controller closes the output port of the chamber and opens the inlet valve, water from the supply pipe flows into the wall of the chamber through the inlet valve first and then flows into the recycle pipe
Data Source
AI summary
A system includes a chamber, an inlet valve, a control device, and a recycle pipe. The chamber is configured to perform a semiconductor process and including an output port. The inlet valve is coupled to the chamber and a supply pipe. The controller is coupled to the inlet valve and the chamber. The recycle pipe arranged outside the chamber and coupled to the chamber. The recycle pipe is independent from the supply pipe. The controller is configured to determine whether the chamber is idle, and is configured to control the inlet valve based on the determination of whether the chamber is idle. When the controller closes the output port of the chamber and opens the inlet valve, water from the supply pipe flows into a wall of the chamber through the inlet valve first and then flows into the recycle pipe.