Buffer Chamber Exhaust Segmentation for Byproduct Inhibition
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Solution Overview
Problem
In semiconductor device manufacturing, single-wafer-type apparatuses face challenges in preventing the generation of byproducts in the buffer space during the formation of thin films, which can adversely affect the uniformity and characteristics of the semiconductor device due to reactions between process gases.
Innovation Solution
A substrate processing apparatus and method that involves loading a substrate into a process chamber, supplying a first-element-containing gas and a second-element-containing gas via a buffer chamber, and performing an exhaust process that includes exhausting the atmosphere of both the buffer chamber and the process chamber to prevent byproduct generation, using separate exhaust systems to control and remove gases effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single-wafer-type apparatus with a buffer chamber is used to supply gases uniformly to the substrate, then gas supply uniformity is improved, but byproducts are generated in the buffer chamber due to gas reactions
Solution Approach 1:
The exhaust system is segmented into two independent parts: a first exhaust system for the buffer chamber and a second exhaust system for the process chamber. This segmentation allows separate control and exhaustion of gases from each chamber, preventing byproduct generation in the buffer chamber while maintaining uniform gas supply to the substrate.
Solution Approach 2:
The buffer chamber acts as an intermediary space between the gas supply source and the process chamber. By introducing this intermediate buffer zone with its own dedicated exhaust system, the patent prevents direct reaction between process gases that would occur in a single-chamber system, thereby eliminating byproduct formation while preserving the uniform gas distribution function.
2Ease of operation
If process gases are supplied via a buffer chamber, then gas distribution is improved, but reactions between gases in the buffer chamber generate byproducts that adversely affect substrate characteristics
Solution Approach 1:
The exhaust functionality is segmented into two independent systems: the first exhaust system handles the buffer chamber atmosphere while the second exhaust system handles the process chamber atmosphere. This segmentation prevents harmful gas reactions in the buffer chamber, ensuring substrate characteristics are not adversely affected while maintaining ease of gas distribution operation.
Solution Approach 2:
The buffer chamber is maintained as a controlled environment with its own exhaust system that can create an inert or purified atmosphere. This prevents unwanted chemical reactions between process gases in the buffer chamber, thereby protecting substrate characteristics while preserving the operational advantage of buffered gas distribution.
3Device complexity
If a single exhaust system is used for both buffer chamber and process chamber, then device complexity is reduced, but byproducts cannot be effectively removed from the buffer chamber
Solution Approach 1:
The exhaust system is divided into two separate systems: a first exhaust system dedicated to the buffer chamber and a second exhaust system dedicated to the process chamber. This segmentation enables effective removal of byproducts from the buffer chamber while maintaining reasonable device complexity through modular design and independent control of each exhaust pathway.
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 approach inhibits the generation of byproducts in the buffer space, ensuring uniform film deposition and maintaining the characteristics of the semiconductor device by effectively removing residual gases and improving the efficiency of gas supply to the substrate.
Implementation Method 1
exhausting an atmosphere of the buffer chamber
Implementation Method 2
exhausting an atmosphere of the process chamber after exhausting the atmosphere of the buffer chamber
Implementation Method 3
supplying a first-element-containing gas via a buffer chamber of a shower head to the substrate
Implementation Method 4
The film is formed by allowing at least two types of gases to react with one another above a substrate or on the surface of the substrate
Data Source
AI summary
Generation of byproducts is inhibited in a buffer space even in a single-wafer-type apparatus using the buffer space. A method of manufacturing a semiconductor device includes (a) loading a substrate into a process chamber; (b) supplying a first-element-containing gas via a buffer chamber of a shower head to the substrate placed in the process chamber; (c) supplying a second-element-containing gas to the substrate via the buffer chamber; and (d) performing an exhaust process between (b) and (c), wherein (d) includes: exhausting an atmosphere of the buffer chamber; and exhausting an atmosphere of the process chamber after exhausting the atmosphere of the buffer chamber.