Gas Distribution Apparatus for Rapid Switching in Etch Chambers
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Solution Overview
Problem
Conventional gas distribution systems lack flexibility to efficiently handle rapid switching of process gases, particularly in high aspect ratio etch applications such as through silicon via formation, where precise and efficient gas flow control is crucial.
Innovation Solution
A gas distribution apparatus with a manifold, flow restrictors, and valves that allow selective control of process gas flow to multiple delivery zones, enabling flexible gas distribution and rapid switching between gas sources, ensuring efficient gas delivery to specific areas within a process chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional gas distribution systems are used, then the system structure is simple, but the system lacks flexibility to facilitate rapid switching of process gases and high aspect ratio etch applications
Solution Approach 1:
The gas distribution system is divided into multiple independent flow paths, each with its own flow controllers and valves. This segmentation allows selective activation of different gas paths for rapid switching between process gases without affecting the entire system, thereby improving adaptability while maintaining manageable complexity through modular design
Solution Approach 2:
The system incorporates dynamically controllable components including multiple valves that can be selectively opened and closed, and flow controllers that can adjust gas flow rates in real-time. This dynamic control capability enables rapid switching between different gas configurations and optimizes gas distribution for various process conditions
2Productivity
If conventional gas distribution systems are used, then the device complexity is low, but the efficiency of high aspect ratio etch applications is insufficient
Solution Approach 1:
Different flow paths and delivery zones are configured with specific flow controllers and restrictors optimized for their particular function. This local optimization allows each part of the system to be tailored for specific etching requirements, improving overall etching efficiency while distributing complexity across specialized modular components
Solution Approach 2:
Multiple flow controllers and flow restrictors act as intermediary devices between the gas sources and the process chamber. These intermediaries provide precise control over gas flow rates and distribution, enabling efficient high aspect ratio etching by mediating the gas delivery to match specific process requirements
3Measurement precision
If selective gas flow control to multiple zones is implemented, then precise gas distribution is achieved, but the number of components increases
Solution Approach 1:
The flow controllers and valves are designed to serve multiple functions across different flow paths and delivery zones. Each component can be selectively activated to control gas flow to specific zones, providing precise multi-zone control while reducing the total number of components needed compared to having dedicated controls for each zone
Data Source
AI summary
In some embodiments, a gas distribution apparatus may include: a manifold having a gas inlet to receive a process gas from a fast gas exchange unit and a first gas outlet to provide the process gas to a first gas delivery zone; a plurality of flow restrictors fluidly coupled to one another in parallel and to the gas inlet, wherein each of the plurality of flow restrictors are configured to allow at least a portion of a total flow of a process gas through each of the plurality of flow restrictors; and a plurality of valves each coupled to respective ones of the plurality of flow restrictors, wherein the plurality of valves are configured to be selectively opened to allow the process gas to flow through selective ones of the plurality of flow restrictors to provide a desired percentage of a total flow of the process gas to the outlet.