Vertical Furnace Trapping Device for SOI Substrate Contaminants
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vertical furnaces fail to completely suppress peripheral roughness zones on silicon-on-insulator (SOI) substrates due to contaminant gases in the incoming inert gas flow, leading to thickness irregularities incompatible with microelectronic device applications.
Innovation Solution
A vertical furnace equipped with a trapping device composed of silicon, featuring a circular part with regularly distributed blades and screens, positioned near the fresh gas inlet to effectively trap contaminant gases, ensuring minimal gas flow encroachment on the substrate area and promoting uniform gas flow and contact area for enhanced contaminant removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If commercial filters or hot purifiers are used to decrease contaminant concentrations, then contaminant levels are reduced, but peripheral roughness zones cannot be completely suppressed
Solution Approach 1:
A trapping device is introduced as an intermediary component between the fresh gas inlet and the substrates. This device captures contaminant gases (oxygen, water vapor, CO, CO2) from the incoming gas flow before they reach the substrates, preventing the formation of peripheral roughness zones during thermal annealing
Solution Approach 2:
The trapping device performs preliminary purification of the gas flow by capturing contaminants upstream, before the gas contacts the substrates. This preliminary action prevents contaminant-related surface roughness from occurring in the first place, rather than attempting to correct it afterward
2Manufacturing precision
If the trapping device contact area with fresh gas is increased, then contaminant trapping efficiency is improved, but device complexity increases
Solution Approach 1:
The trapping device utilizes a three-dimensional structure with blades extending vertically from a support plate, creating multiple surfaces for contaminant capture. This dimensional approach increases the effective contact area with gas flow without proportionally increasing the device's footprint or structural complexity
Solution Approach 2:
The trapping device employs a structure with multiple blades and openings that create effective porous-like pathways for gas flow. The blades are spaced to allow gas penetration while providing extensive surface area for contaminant adsorption, achieving high trapping efficiency without solid blocking structures
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 significantly reduces contaminant gas presence, thereby minimizing peripheral roughness zones and achieving the required surface smoothness for SOI substrates, ensuring high-quality substrate production for microelectronic devices.
Implementation Method 1
a trapping device (100) formed from at least one material capable of trapping all or some of the contaminants present in the fresh gas
Data Source
AI summary
A vertical furnace includes a chamber intended for receiving a loading column, an inlet channel for fresh gas, arranged at an upper end of the chamber, the loading column comprising an upper portion, and a central portion for supporting a plurality of substrates. The vertical furnace further comprises a trapping device made of at least one material suitable for trapping all or part of the contaminants present in the fresh gas. The trapping device includes a circular part arranged on the upper part of the loading column, the circular part comprising fins regularly distributed over an upper surface of the circular part in order to increase the contact surface of the trapping device with the fresh gas.