Pivotable Sealing Element for CVD Reactor Loading Opening
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Solution Overview
Problem
In CVD reactors, the etching effect of cleaning gases often extends beyond the processing chamber, leading to unwanted parasitic coatings on the susceptor and chamber walls, requiring inefficient dry etching processes to remove them.
Innovation Solution
The processing chamber is encapsulated by an inner housing with a sealing element that can be pivotally fastened and elastically supported, ensuring a gastight seal around the loading opening, using a combination of elastic elements and mechanical adjustments to enhance sealing tightness and control the etching gas's effect within the chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cleaning gas is introduced into the processing chamber, then the cleaning effect is improved, but the etching effect extends beyond the processing chamber causing parasitic coatings
Solution Approach 1:
The patent extracts the harmful etching effect from the processing chamber by introducing a shield housing that physically blocks the cleaning gas from reaching areas outside the processing chamber. The shield housing with its opening facing away from the processing chamber creates a containment structure that directs the cleaning gas flow inward, preventing parasitic coating formation on external surfaces.
Solution Approach 2:
The shield housing acts as an intermediary structure between the cleaning gas source and the external environment. It mediates the interaction by allowing the cleaning gas to perform its function within the processing chamber while simultaneously blocking it from causing harmful effects outside, thus resolving the contradiction between effective cleaning and preventing parasitic coatings.
2Reliability
If the sealing element is made rigid to ensure gastight seal, then the sealing reliability is improved, but the sealing element cannot accommodate thermal expansion or misalignment
Solution Approach 1:
The sealing element is designed as a flexible component that can elastically deform to maintain contact with the sealing surface. This flexibility allows the sealing element to accommodate thermal expansion of the processing chamber and any misalignment that may occur during operation, while still maintaining a reliable gastight seal through continuous contact.
Solution Approach 2:
The sealing element's physical parameters (such as its elastic modulus or geometric dimensions) are designed to change in response to thermal conditions. This allows the sealing element to adapt its properties under different thermal conditions, maintaining sealing effectiveness across a range of operating temperatures without requiring a rigid, temperature-insensitive design.
3Ease of operation
If the closure element is designed to be pivotable for easy operation, then the ease of operation is improved, but the sealing reliability may be compromised
Solution Approach 1:
The closure element incorporates self-centering features that automatically align the sealing surface with the processing chamber opening during the pivoting motion. This self-alignment mechanism ensures that the sealing element maintains proper positioning and reliable sealing contact throughout the opening and closing operations, eliminating the need for precise manual alignment while preserving sealing integrity.
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 configuration limits the etching effect to the processing chamber, reducing parasitic coating formation and improving the efficiency of the cleaning process by maintaining a controlled environment and preventing unwanted gas leakage.
Implementation Method 1
the sealing element is elastically supported, ensuring a gastight seal around the loading opening
Implementation Method 2
A vacuum pump is provided, with which the reactor housing and processing chamber can be evacuated
Data Source
AI summary
A CVD reactor includes a gas-tight and evacuatable reactor housing and an inner housing arranged therein. The inner housing has means for the infeed of a process gas and means for holding a substrate for treatment in the inner housing by means of the process gases. The inner housing also has a loading opening which can be closed off by a sealing element of a closure element. In its closure position, the closure element bears with an encircling sealing zone against a counterpart sealing zone which encircles the loading opening on the outer side of the inner housing. The sealing element is fastened to a carrier as to be adjustable in terms of inclination and/or pivotally movable about at least one spatial axis (X, Y, Z) and/or so as to be elastically deflectable in the direction of one of the spatial axes (X, Y, Z).