Divert Line Architecture for Stable High-Flow Process Gas Routing
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Solution Overview
Problem
Semiconductor processing systems face issues with fluid pressure and condensation in divert lines due to the diversion of process gases, leading to pressure spikes and residue buildup, which affect deposition rates and uniformity.
Innovation Solution
Incorporating a divert weldment that splits process gases into multiple outlets, using passive flow control devices like choke orifices to ensure equal flow between chambers, and employing valves with flow coefficients greater than 0.3 to 0.9 to manage pressure and enable higher flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If process gases are diverted away from processing chambers to tune flow rates, then gas flow control is improved, but fluid pressure issues and condensation occur in divert lines
Solution Approach 1:
The divert line is segmented into multiple parallel conduits instead of a single line, distributing the gas flow to reduce pressure buildup and prevent condensation in any single path
Solution Approach 2:
The system transitions from a single-dimensional divert line to a multi-dimensional network of parallel conduits, adding spatial distribution to the gas flow path management
2Productivity
If process gases are diverted to control deposition rates, then deposition rate control is improved, but condensation of process gases occurs within divert lines
Solution Approach 1:
The divert line is divided into multiple parallel conduits, reducing the volume and surface area where condensation can occur in each individual conduit
Solution Approach 2:
Heating elements are introduced as intermediary components within the divert lines to maintain gas temperature and prevent condensation
3Productivity
If higher flow rates are used to increase substrate throughput, then productivity is improved, but pressure spikes occur in divert lines
Solution Approach 1:
The gas flow is segmented into multiple parallel paths, distributing the total flow load and reducing pressure spikes in each individual conduit
Solution Approach 2:
Multiple parallel conduits are combined into a unified divert system that collectively handles higher total flow rates while maintaining stable pressure through distributed flow management
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 design reduces pressure in divert lines, allows for increased deposition rates, and ensures uniform gas distribution across multiple chambers, improving substrate throughput and deposition uniformity.
Implementation Method 1
between one and five heater jackets surrounding the first divert weldment
Data Source
AI summary
Exemplary semiconductor processing systems may include a lid plate and a gas splitter. The gas splitter may be seated on the lid plate. The gas splitter may include a top surface and a plurality of side surfaces. The gas splitter may define a gas inlet, a gas outlet, a gas lumen that extends between and fluidly couples the gas inlet with the gas outlet, and a first divert lumen that is fluidly coupled with the gas lumen and that directs gases away from a processing chamber through a divert outlet. The semiconductor processing system may include a first divert weldment. The first divert weldment may extend from and fluidly couple to the divert outlet. The first divert weldment may include a first divert weldment outlet and a second divert weldment outlet.