POU Valve Manifold Layout to Prevent ALD Precursor Mixing
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Solution Overview
Problem
Current atomic layer deposition (ALD) systems face issues with premature deposition and clogging due to the mixing of precursor gases, leading to valve inoperability and increased maintenance costs, as they often rely on a single valve for multiple gases without adequate purging schemes.
Innovation Solution
A point-of-use (POU) valve manifold with separate dedicated flow paths and valves for each precursor gas, eliminating dead-leg volumes and allowing independent switching, along with on-board heating and efficient dosing, prevents gas mixing and reduces particle contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single valve is used to control multiple precursor gases, then device complexity is reduced, but precursor gases mix in the valve causing premature deposition and particulate formation that clogs the valve
Solution Approach 1:
The system divides the single valve control function into multiple separate valves, each dedicated to controlling a specific precursor gas. This segmentation prevents gas mixing at the valve level while maintaining manageable system complexity through modular architecture.
Solution Approach 2:
Individual valve actuators serve as intermediaries between the control system and each precursor gas line. These intermediaries enable independent control of each gas flow without direct interaction between gas streams, preventing premature deposition while allowing centralized control.
2Reliability
If elaborate purging schemes are implemented to prevent particulate formation, then valve reliability is maintained, but system complexity and maintenance requirements increase
Solution Approach 1:
The design extracts and eliminates the need for complex purging schemes by preventing gas mixing at the source through dedicated flow paths. Each precursor gas is isolated in its own pathway from the valve to the substrate, removing the harmful mixing effect that would require purging to address.
Solution Approach 2:
The system establishes separate dedicated flow paths for each precursor gas before the gases can mix and cause premature deposition. This preliminary structural arrangement prevents particulate formation in the first place, eliminating the need for subsequent purging actions.
3Reliability
If separate dedicated flow paths and valves are used for each precursor gas, then gas mixing is prevented and valve longevity is improved, but device complexity increases
Solution Approach 1:
The system merges multiple individual valve assemblies into a unified manifold structure that provides separate dedicated flow paths for each precursor gas. This consolidation achieves the reliability benefits of separate control while presenting a compact, integrated solution that manages the inherent complexity.
Solution Approach 2:
The manifold structure serves multiple functions simultaneously: it houses individual valve actuators, provides separate flow paths for each precursor gas, enables independent control, and prevents gas mixing. This multi-functionality justifies the structural complexity by delivering comprehensive solutions to multiple problems.
4Manufacturing precision
If precursor gases are kept separated to prevent premature deposition, then deposition quality is improved, but system complexity increases without efficient dosing mechanisms
Solution Approach 1:
The dedicated flow paths are designed to automatically deliver precise amounts of each precursor gas to the substrate without requiring complex external dosing mechanisms. The system self-regulates gas delivery through the individual valve actuators and isolated pathways, maintaining deposition precision while simplifying the overall control architecture.
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 solution ensures efficient and reliable delivery of precursor gases, reducing valve degradation, maintenance costs, and improving deposition quality by preventing gas mixing and particle contamination, thereby enhancing the operational efficiency and longevity of ALD systems.
Implementation Method 1
The manifold may also include an on-board heating element
Implementation Method 2
The POU-valve manifold may have a plurality of precursor gas inlets, each controlled by at least one valve, and a purge gas inlet. Each precursor uses at least one dedicated POU valve and has a dedicated flow path separate from flow paths for other precursor gases
Implementation Method 3
The two or more-chemical species are referred to as precursor gases and are used to form a thin film deposition of a material on a substrate
Data Source
AI summary
Various embodiments include an apparatus to supply gases to a tool. In various examples, the apparatus includes a point-of-use (POU) valve manifold that includes a manifold body to couple to a chamber of the tool. The manifold body has multiple gas outlet ports. A purge-gas outlet port of the manifold body is directed substantially toward the outlet ports. For each of multiple gases to be input to the POU-valve manifold, the POU-valve manifold further includes: a first valve coupled to the manifold body and a divert valve coupled to the first valve. The first valve can be coupled to a gas supply and has a separate gas flow path internal to the manifold body and separate from remaining ones of the gas flow paths. The divert valve diverts the gas during a period when the precursor gas is not to be directed into the chamber by the first valve. Other examples are disclosed.