Layered Laminar Flow Restrictor for Precise Semiconductor Gas Control
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Solution Overview
Problem
Semiconductor fabrication processes require more accurate and consistent gas flow control with improved transient response times, which existing mass flow control technologies struggle to achieve due to limitations in flow restrictor performance.
Innovation Solution
A laminar flow restrictor design featuring a stack of layers with specific apertures and flow passages, manufactured through layer blank stacking and bonding, providing controlled flow impedance and improved gas delivery accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional flow restrictors are used, then device complexity is reduced, but measurement precision and flow control accuracy deteriorate
Solution Approach 1:
The flow restrictor is segmented into multiple discrete layers (first layer, second layer, third layer, etc.) stacked together. Each layer contains specific flow passages and apertures, allowing the complex flow control function to be divided into simpler modular components. This segmentation enables precise control of gas flow while maintaining manufacturability through standardized layer fabrication and assembly.
2Speed
If existing mass flow control technologies are used, then equipment costs are reduced, but transient response times deteriorate
Solution Approach 1:
The invention transitions from conventional single-plane flow restriction to multi-layer stacked architecture, adding the vertical dimension (z-axis) to the traditional two-dimensional flow control plane. Gas flow is restricted through multiple stacked layers with flow passages extending in different directions, creating a three-dimensional flow path that improves transient response while distributing the complexity across multiple simple-to-manufacture layers.
3Reliability
If simpler flow restrictor designs are used, then manufacturing precision requirements are reduced, but gas delivery consistency deteriorates
Solution Approach 1:
The flow restrictor function is segmented across multiple layers, where each layer contributes to the overall flow control. This segmentation allows manufacturing precision to be distributed across simpler individual layer fabrication processes rather than requiring high precision in a single complex component. The stacked architecture provides redundancy and consistency in gas delivery through multiple flow paths.
Solution Approach 2:
The invention changes the geometric parameters of the flow restrictor by introducing multi-layer stacking with specific aperture arrangements and flow passage configurations. This parameter change transforms the flow control mechanism from simple planar restriction to complex three-dimensional flow management, improving gas delivery consistency through enhanced flow distribution while using manufacturable layer geometries.
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 laminar flow restrictor enhances the accuracy and repeatability of gas flow control, reducing calibration requirements and improving response times in semiconductor fabrication processes.
Implementation Method 1
laminar flow restrictor design featuring a stack of layers with specific apertures and flow passages
Implementation Method 2
flow restrictor for restricting the flow of a gas... A flow passage is defined by the plurality of first layers and the plurality of second layers
Data Source
AI summary
Apparatuses for controlling gas flow are important components for delivering process gases for semiconductor fabrication. These apparatuses for controlling gas flow frequently rely on flow restrictors which can provide a known flow impedance of the process gas. In one embodiment, a flow restrictor is disclosed, the flow restrictor constructed of a plurality of layers, one or more of the layers having a flow passage therein that extends from a first aperture at a first end of the flow restrictor to a second aperture at a second end of the flow restrictor.