Multi-reactor Vapor Phase Growth Apparatus Gas Flow Control
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Solution Overview
Problem
In vapor phase growth apparatuses with multiple reactors, achieving uniform flow rates of process gases across all reactors is challenging, leading to variations in film characteristics such as thickness and composition.
Innovation Solution
A vapor phase growth apparatus is designed with a primary gas supply path and secondary gas supply paths branching to each reactor, featuring a main flow rate controller and auxiliary flow rate controllers, along with control circuits to ensure uniform flow rates by calculating and distributing a uniform flow rate value across all reactors, maintaining consistent pressure and flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a vapor phase growth apparatus with multiple reactors is used to improve productivity, then the output of semiconductor films increases, but it becomes difficult to control uniform flow rates of process gases across all reactors, leading to variations in film characteristics
Solution Approach 1:
The gas supply system is segmented into multiple independent control paths, with each reactor having its own flow rate controller. This segmentation allows each reactor to receive precisely controlled gas flow rates independently, ensuring uniform film characteristics across all reactors while maintaining high productivity through parallel processing
Solution Approach 2:
Flow rate controllers are implemented in each gas supply path to provide feedback control of the process gas flow rates. The controllers continuously monitor and adjust the gas flow to maintain constant rates despite variations in system conditions, ensuring uniform film characteristics across multiple reactors operating simultaneously
2Manufacturing precision
If flow rate controllers are added to each gas supply path to control flow rates precisely, then film characteristic uniformity improves, but the device complexity and cost increase
Solution Approach 1:
A standardized flow rate controller design is used across all gas supply paths, allowing the same controller unit to be universally applied to multiple reactors. This multi-functional approach maintains precise flow control for uniform film characteristics while reducing overall system complexity through component standardization and reuse
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 allows for the simultaneous formation of films with uniform characteristics across multiple reactors, ensuring consistent film thickness and composition by controlling the flow rates and pressures accurately.
Implementation Method 1
a first pressure gauge measuring a pressure in the primary gas supply path
Implementation Method 2
a main flow rate controller provided in the main secondary gas supply path; (n−1) auxiliary flow rate controllers each provided in one of the auxiliary secondary gas supply paths
Implementation Method 3
a vapor phase growth technique in which a single crystal film is grown on a substrate such as a wafer by vapor phase growth
Implementation Method 4
an epitaxial growth technique in which a single crystal film is grown on a substrate such as a wafer by vapor phase growth
Implementation Method 5
there is a metal organic chemical vapor deposition method (MOCVD method)
Data Source
AI summary
A vapor phase growth apparatus includes n (n is an integer of 2 or more) reactors; a primary gas supply path supplying a mixed gas to the reactors; n secondary gas supply paths connected to one of the reactors including a main secondary gas supply path and (n−1) auxiliary secondary gas supply paths; a first pressure gauge; a main flow rate controller provided in the main secondary gas supply path; (n−1) auxiliary flow rate controllers provided in the auxiliary secondary gas supply paths; a first control circuit instructing a first flow rate value; and a second control circuit calculating a second flow rate value being 1/n of a sum of a flow rate value measured by the main flow rate controller and flow rate values measured by the auxiliary flow rate controllers, and instructing the second flow rate value to the auxiliary flow rate controllers.