Fluid Supply Network for Bevel Etch Process Flexibility
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Solution Overview
Problem
The increasing sensitivity of semiconductor substrates to contamination and the need for flexible process equipment to minimize downtime and contamination risks in semiconductor wafer manufacturing, while maintaining effective fluid delivery for reduced feature sizes.
Innovation Solution
A fluid supply system with a network of valves and supply lines that allows for flexible routing of tuning and process fluids between edge and center supplies within a semiconductor processing chamber, enabling rapid reconfiguration and minimizing contamination risks through purging and separate fluid management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate processing chambers are used for different fluid delivery configurations, then process flexibility and performance are improved, but the number of chambers required increases and maintenance costs increase
Solution Approach 1:
The patent implements a single processing chamber that can perform multiple process operations by reconfiguring fluid delivery paths using valve networks. The chamber is designed with enable valves and crossover valves that allow the same chamber to deliver process fluids to different locations (edge or center) depending on the operational mode, making one chamber universal for multiple purposes rather than requiring separate dedicated chambers for each configuration.
Solution Approach 2:
The patent employs dynamic reconfiguration of fluid delivery systems within a single chamber through controlled valve operations. The enable valves and crossover valves can be dynamically switched to change fluid delivery targets from edge to center or vice versa, allowing the chamber to adapt its functionality in real-time without physical reconfiguration or requiring multiple static chambers.
2Productivity
If process equipment is reconfigurable to perform multiple operations, then equipment utilization is maximized and downtime is minimized, but the risk of contamination between processes increases
Solution Approach 1:
The patent incorporates purge valves and purge fluid delivery systems that can be activated before switching between different process operations. This preliminary purging action removes residual process fluids from the fluid delivery network before the next process begins, preventing cross-contamination while enabling rapid reconfiguration of the chamber for different operations, thus maintaining high equipment utilization without contamination risks.
Solution Approach 2:
The patent uses purge fluid as an intermediary substance that cleans the fluid delivery network between different process operations. The purge fluid acts as a mediator that removes harmful residues from previous processes before the next process fluids are introduced, preventing direct contamination between different process chemicals while allowing the same chamber to be reused.
3Manufacturing precision
If feature size is reduced, then manufacturing precision is improved, but the sensitivity to contamination increases
Solution Approach 1:
The patent extracts and removes process fluids from the delivery network using purge valves and purge pumps when not in use or before switching operations. This extraction of residual fluids prevents them from settling or contaminating the substrate, which is particularly important when manufacturing small features where even trace contamination can significantly impact quality. The system actively removes potential contaminants rather than relying on passive containment.
Data Source
AI summary
An apparatus to supply a plurality of process fluids for processing a substrate in a semiconductor processing chamber. The apparatus includes a plurality of process fluid supply valves and a fluid supply network that is defined between a crossover valve and a tuning supply valve. The apparatus further includes a tuning fluid supply being connected to the fluid supply network through the tuning supply valve. Further included with the apparatus is a plurality of process fluids that are connected to the fluid supply network through the plurality of process fluid supply valves. A process chamber that has a substrate support is also included in the apparatus. The process chamber further including an edge fluid supply and a center fluid supply, the edge fluid supply connected to the fluid supply network through an edge enable valve and the center supply connected to the fluid supply network through a center enable valve.