Shuttered Vacuum Processing Chamber for Uniform Oxygen Gas Flow
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Solution Overview
Problem
Existing vacuum processing apparatuses face challenges in stably supplying oxygen-containing gases to substrates due to the reactivity of oxygen, which leads to adsorption on chamber walls and pressure differences around the substrate, resulting in non-uniform film formation.
Innovation Solution
A vacuum processing apparatus with a shutter that moves between shielding and retracted positions, incorporating a gas supplier and a gas exhauster to create a processing space for uniform oxygen gas distribution, reducing pressure differences and adsorption issues by exhausting gases from the center side.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If oxygen-containing gas is supplied from a position far from the substrate, then the gas can reach the substrate, but the oxygen reacts with and adsorbs on metal adhering to the inner wall of the chamber before reaching the substrate, making it difficult to stably supply the gas to the metal film
Solution Approach 1:
The shutter serves as an intermediary structure that defines a dedicated processing space between itself and the substrate. By moving the shutter to cover the substrate, a confined space is created where oxygen-containing gas can be supplied without premature reaction with chamber walls. The shutter acts as a movable barrier that isolates the gas supply path from the broader chamber environment.
Solution Approach 2:
The solution transitions from a vertical gas supply approach (from above the substrate) to a horizontal/directional approach within the processing space. The gas is supplied into the confined space between the shutter and substrate, creating a controlled environment where the gas flow path is shortened and directed toward the substrate without traversing the entire chamber distance.
2Manufacturing precision
If the shielding member is moved to the shielding position and the oxygen supplier is moved to the upper position to supply oxygen-containing gas to the substrate, then the substrate is covered and gas can be supplied, but a difference occurs in pressure between the vicinity of the center of the substrate and the outer edge thereof
Solution Approach 1:
The gas exhauster is positioned closer to the center side of the processing space to create a localized pressure gradient. This strategic placement ensures that gas is preferentially exhausted from the center region, balancing the pressure distribution across the substrate surface. The localized exhaust position compensates for the natural pressure buildup that would otherwise occur at the center during gas supply.
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 ensures stable and uniform oxygen supply, reducing non-uniformity in film formation and pressure distribution across the substrate, thereby improving the consistency of metal oxide film deposition.
Implementation Method 1
a gas exhauster provided closer to a center side of the processing space than the gas supplier and configured to exhaust the gas from the processing space
Data Source
AI summary
A vacuum processing apparatus includes: a stage on which a substrate is placed; and a shutter configured to be able to move between a shielding position at which the stage is covered and a retracted position that is retracted from the shielding position, wherein the shutter arranged at the shielding position forms a processing space between the shutter and the stage, and includes: a gas supplier configured to supply a gas into the processing space; and a gas exhauster provided closer to a center side of the processing space than the gas supplier and configured to exhaust the gas from the processing space.