Annealing Mini-Environment Chamber for High-Pressure Wafer Processing
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Solution Overview
Problem
Conventional annealing chambers are limited by seal failures at high temperatures and pressures, preventing effective high-temperature and high-pressure processing of wafers due to the incompatibility of existing components for temperature and pressure gauges, burst disks, and dynamic seals.
Innovation Solution
A processing chamber with a mini-environment utilizing a double-walled labyrinthine exit flow path and steam injection to create a thermally isolated zone for wafer processing, allowing operation at elevated temperatures and pressures while maintaining lower temperatures outside the mini-environment, enabling the use of existing components and materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional seals are used to isolate the chamber interior, then the chamber can operate at lower temperatures, but the seals fail at high temperatures above 500°C
Solution Approach 1:
The chamber is divided into two distinct zones: a high-temperature process zone where wafers are annealed at temperatures above 500°C, and a low-temperature bulk chamber that houses temperature and pressure gauges, burst disks, and seals. This spatial segmentation allows each zone to operate at optimal temperatures for its specific function, resolving the contradiction between high-temperature processing capability and seal reliability.
2Productivity
If high pressure annealing is applied, then processing effectiveness improves, but sealing components fail due to the combination of pressure and temperature
Solution Approach 1:
The system separates the high-pressure annealing process from the bulk chamber environment. The process zone maintains high pressure for effective wafer annealing, while the bulk chamber remains at lower pressure, protecting sealing components from the combined stress of high temperature and high pressure.
Solution Approach 2:
A physical barrier or membrane system acts as an intermediary between the high-pressure process zone and the low-pressure bulk chamber. This intermediary allows the high-pressure annealing to proceed effectively while preventing the direct exposure of sealing components to the harsh high-pressure, high-temperature environment.
3Manufacturing precision
If the entire chamber is heated to high temperature for effective annealing, then processing quality improves, but component availability decreases due to extreme temperature requirements
Solution Approach 1:
The chamber is segmented into a high-temperature process zone for high-quality annealing and a low-temperature bulk chamber that can accommodate standard commercial components such as temperature gauges, pressure gauges, burst disks, and seals. This allows the system to achieve high manufacturing precision in the process zone while maintaining component availability and ease of maintenance in the bulk chamber.
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
Enables efficient and uniform high-temperature and high-pressure processing of wafers within the mini-environment, isolating the wafer environment from the bulk chamber and allowing for broader component selection, while maintaining lower temperatures outside the high-temperature zone, thus overcoming the limitations of conventional systems.
Implementation Method 1
The heater assembly comprises a bottom, sidewall and a top defining a process region. At least one floor heating element is located adjacent the bottom of the heater assembly. At least one sidewall heating element is adjacent the sidewall of the heater assembly.
Implementation Method 2
A steam injection port is in the bottom of the chamber body and the bottom of the heater assembly. The steam injection port provides a fluid path into the process region of the heater assembly.
Implementation Method 3
The sidewall of the heater assembly comprising a double-walled labyrinthine exit flow path to provide fluid communication between the process region within an interior of the heater assembly and the upper interior region of the chamber body.
Data Source
AI summary
Apparatus and methods to process one or more wafers are described. The apparatus comprises a chamber defining an upper interior region and a lower interior region. A heater assembly is on the bottom of the chamber body in the lower interior region and defines a process region. A wafer cassette assembly is inside the heater assembly and a motor is configured to move the wafer cassette assembly from the lower process region inside the heater assembly to the upper interior region.