Shared Gas Splitter Architecture for Uniform Multi-Chamber Delivery
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Solution Overview
Problem
Conventional substrate processing systems face inefficiencies in substrate throughput due to inadequate wafer transfer systems and chamber configurations, leading to thermal non-uniformity and particle contamination, as well as uneven gas flow and cross-talk between chambers.
Innovation Solution
The implementation of a substrate processing system with a gas splitter and valve blocks that split gas flow equally among multiple chambers, incorporating a remote plasma unit and isolation valves to prevent cross-talk, and using a transfer apparatus that vertically aligns with processing chamber regions to enhance access and processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional wafer transfer systems are used in cluster tools, then substrate processing can be performed, but substrate throughput is limited and processing efficiency decreases
Solution Approach 1:
The gas delivery system is segmented into multiple independent valve blocks, each controlling gas flow to specific chambers. This segmentation allows parallel gas distribution to multiple chambers simultaneously, improving substrate throughput without requiring complex centralized control mechanisms.
Solution Approach 2:
The gas splitter serves multiple functions: it distributes gas to multiple chambers, provides flow equalization, and enables independent chamber control through integrated valve blocks. This multi-functionality improves processing efficiency without adding separate dedicated systems for each function.
2Productivity
If chambers are configured to process multiple substrates, then productivity increases, but thermal non-uniformity and particle contamination occur
Solution Approach 1:
Each chamber receives independently controlled gas flow through dedicated valve blocks, allowing local optimization of processing conditions. This local quality control ensures uniform thermal and contamination characteristics across all chambers while maintaining multi-substrate processing capability.
Solution Approach 2:
The gas splitter acts as an intermediary device that equalizes gas flow distribution to multiple chambers. By providing a centralized flow equalization point, it ensures uniform gas delivery to all chambers, preventing thermal non-uniformity and contamination issues that would arise from direct multi-chamber processing.
3Device complexity
If gas is delivered to multiple chambers from single sources, then system complexity is reduced, but uneven gas flow and cross-talk between chambers occur
Solution Approach 1:
The gas delivery system is divided into separate valve blocks for different gas types (e.g., silicon-containing precursor, oxygen-containing precursor). Each valve block independently controls flow to specific chambers, ensuring uniform gas distribution and preventing cross-talk while maintaining manageable system complexity.
Solution Approach 2:
The gas splitter serves as a mediator that receives gas from single sources and distributes it equally to multiple chambers through controlled valve blocks. This intermediary structure enables flow equalization and chamber isolation without requiring complex multi-source gas delivery systems.
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 scalable multi-substrate processing with equal flow distribution, prevents thermal non-uniformity and contamination, and maintains a vacuum environment across multiple chambers, improving substrate throughput and processing uniformity.
Implementation Method 1
a remote plasma unit supported above the gas splitter
Implementation Method 2
Each of the plurality of side manifolds may include a cooling channel that extends along at least a portion of a length of the side manifold
Data Source
AI summary
Exemplary substrate processing systems may include a lid plate. The systems may include a gas splitter seated on the lid plate. The gas splitter may define a plurality of gas inlets and gas outlets. A number of gas outlets may be greater than a number of gas inlets. The systems may include a plurality of valve blocks that are interfaced with the gas splitter. Each valve block may define a number of gas lumens. An inlet of each of the gas lumens may be in fluid communication with one of the gas outlets. An interface between the gas splitter and each of the valve blocks may include a choke. The systems may include a plurality of output manifolds seated on the lid plate. The systems may include a plurality of output weldments that may couple an outlet of one of the gas lumens with one of the output manifolds.