Vertical Source Gas Supply Unit and Buffer Tank Arrangement
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Solution Overview
Problem
Existing substrate processing apparatuses face challenges in reducing their footprint while ensuring stable source gas supply to the processing chamber, often resulting in increased equipment cost and maintenance complexity due to the need for longer gas supply lines and heating mechanisms to prevent gas liquefaction.
Innovation Solution
The apparatus includes a buffer tank and valve arrangement unit, with the source gas supply unit, buffer tank, and valve arrangement unit arranged above the processing chamber, allowing for a shorter gas supply line and reducing pressure loss, thereby stabilizing the source gas supply and minimizing equipment footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the source gas supply unit is positioned far from the processing chamber to reduce footprint, then the apparatus size is reduced, but the gas supply stability deteriorates due to longer supply lines and pressure loss
Solution Approach 1:
The source gas supply unit is positioned above the processing chamber in the vertical dimension rather than extending horizontally, allowing short gas supply lines while maintaining compact footprint. The buffer tank is also vertically arranged above the chamber, enabling stable gas supply without increasing the apparatus's horizontal area.
Solution Approach 2:
A buffer tank is introduced as an intermediary component between the source gas supply unit and the processing chamber. This buffer tank temporarily stores source gas and ensures stable supply to the chamber, compensating for any pressure fluctuations caused by the compact arrangement and long-term storage requirements.
2Area of stationary object
If longer gas supply lines are used to connect distant components, then the apparatus footprint is reduced, but pressure loss increases and gas supply stability deteriorates
Solution Approach 1:
By arranging the source gas supply unit and buffer tank vertically above the processing chamber, the gas supply line length is minimized while maintaining a compact horizontal footprint. This vertical arrangement significantly reduces pressure loss compared to horizontal extensions.
Solution Approach 2:
The buffer tank serves as a local gas reservoir near the processing chamber, reducing the effective supply line length from the source unit to the chamber. Gas is supplied from the nearby buffer tank rather than directly from the distant source unit, minimizing pressure loss in the supply lines.
3Reliability
If additional heating mechanisms are added to prevent gas liquefaction in long supply lines, then gas supply stability is improved, but device complexity and maintenance requirements increase
Solution Approach 1:
The compact vertical arrangement minimizes supply line length, reducing heat loss and the risk of gas liquefaction. This geometric optimization reduces or eliminates the need for additional heating mechanisms that would increase device complexity.
Solution Approach 2:
The buffer tank acts as a thermal buffer and gas reservoir positioned close to the processing chamber. By storing gas locally in the buffer tank near the chamber, the supply distance is minimized, reducing heat loss and eliminating the need for complex heating mechanisms along the supply lines.
4Area of stationary object
If components are arranged compactly to reduce footprint, then apparatus size is reduced, but maintenance accessibility deteriorates
Solution Approach 1:
By arranging maintenance components (source gas supply unit, buffer tank, valves) vertically above the processing chamber, the horizontal footprint is minimized while maintaining good vertical accessibility. This allows maintenance personnel to access components from above without requiring large horizontal working spaces.
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 enables stable and efficient source gas supply to the processing chamber, reduces equipment size, and simplifies maintenance by allowing for easier access and reduced maintenance time, while minimizing the need for additional heating mechanisms.
Implementation Method 1
a buffer tank configured to temporarily store the source gas received from the source gas supply unit
Implementation Method 2
supply on/off valves, each of which is configured to perform a supply and a shut-off of the supply of the source gas stored in the buffer tank to the processing chamber
Data Source
AI summary
In a substrate processing apparatus for performing substrate processing by supplying, to a substrate, a source gas containing a source material of a film to be formed on the substrate, a processing chamber in which the substrate is mounted is provided. A source gas supply unit is configured to contain the source material and supplies the source gas toward the processing chamber. A buffer tank is configured to temporarily store the source gas received from the source gas supply unit. A valve arrangement unit in which supply on/off valves, each of which is configured to perform a supply and a shut-off of the supply of the source gas stored in the buffer tank to the processing chamber, are arranged. The valve arrangement unit, the buffer tank, and the source gas supply unit are arranged, in this order, above the processing chamber from the bottom side of the substrate processing apparatus.