Side-Supported Quartz Process Chamber for Uniform Wafer Heating
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Solution Overview
Problem
Existing semiconductor process chambers face challenges in maintaining structural integrity while ensuring uniform heat distribution and avoiding energy attenuation due to thick ribs, which can cause non-uniform temperature on the wafer surface, particularly for temperature-sensitive processes.
Innovation Solution
A curved process chamber design with ribs only on the sides, connected by intervening connectors of uniform thickness, providing structural support without overlapping with the top and bottom walls, and using side rails to enhance stability and thermal uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If ribs are added to the process chamber to enhance structural integrity, then the chamber can withstand lower pressures better, but thick ribs cause energy attenuation and non-uniform temperature distribution on the wafer surface
Solution Approach 1:
The patent applies local quality by positioning ribs only at specific locations where structural support is most needed (at the connections between curved upper/lower walls and at end portions) rather than uniformly across the entire chamber. This localized placement provides structural reinforcement while minimizing the ribs' interference with radiant energy transmission to the wafer, thus maintaining temperature uniformity.
Solution Approach 2:
The patent transitions from a flat-walled chamber design to a curved-walled chamber design with ribs positioned in three-dimensional space at strategic locations. The curved geometry and spatial arrangement of ribs in multiple dimensions allow structural reinforcement without creating large flat rib surfaces that would block radiant energy, thereby resolving the contradiction between strength and temperature uniformity.
2Manufacturing precision
If a flat wall design is used in the process chamber, then uniform deposition on the wafer surface is achieved, but the chamber cannot withstand low pressures as effectively as rounded chambers
Solution Approach 1:
The patent segments the chamber wall into distinct curved portions (curved upper wall and curved lower wall) connected by ribs at specific locations. This segmentation allows each portion to be optimized for its function: the curved geometry provides pressure resistance while the segmented structure with strategic rib placement maintains compatibility with uniform deposition requirements by avoiding large flat surfaces.
3Reliability
If quartz material is used for the process chamber, then the chamber can withstand high temperatures and processing gases, but the chamber lacks mechanical support at low pressures
Solution Approach 1:
The patent merges the quartz material (which provides chemical inertness and thermal resistance) with a ribbed structural framework (which provides mechanical support). The ribs are integrated into the quartz chamber structure, combining the chemical/thermal properties of quartz with the mechanical reinforcement needed to withstand pressure differentials, thus resolving the contradiction between reliability and strength.
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 solution ensures improved structural integrity and uniform heat distribution, reducing manufacturing variability and costs, while maintaining high-quality film deposition on the wafer surface.
Implementation Method 1
rounded chambers often are preferred from a strength standpoint because their curved surfaces can best withstand the inwardly directed force
Implementation Method 2
quartz is substantially transparent to radiant energy. Radiant heaters may be positioned adjacent the exterior of the chamber, and a wafer being processed in the chamber can be heated to elevated temperatures without having the chamber walls heated to the same level
Data Source
AI summary
A process chamber can include a curved upper wall extending longitudinally from a first end portion of the reaction chamber to a second end portion of the reaction chamber. The process chamber can include a curved lower wall cooperating with the curved upper wall to at least partially define an internal cavity, the curved lower wall connected to the curved upper wall from the first end portion to the second end portion at a first side of the process chamber and at a second side of the process chamber. A rail can extend along an exterior surface of the process chamber from the first end portion to the second end portion, the rail disposed at or near a connection between the curved upper wall and the curved lower wall.