Intelligent Hardstop for Gap Control in ALD
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Solution Overview
Problem
The semiconductor industry faces challenges in achieving precise control over the gap between the injector and susceptor assemblies in substrate processing, particularly at varying temperatures, which affects process uniformity and throughput, especially in atomic layer deposition (ALD) processes where low deposition rates and high costs are concerns.
Innovation Solution
The implementation of a system comprising a hardstop, actuator, and emitter-detector configuration that measures and adjusts the gap between the gas distribution assembly and the susceptor assembly using light attenuation, combined with cameras and capacitance sensors for real-time 3D mapping and dynamic adjustments, ensuring precise gap control and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If ALD processes are used to achieve superior step coverage and uniformity, then manufacturing precision is improved, but productivity deteriorates due to very low substrate processing throughput
Solution Approach 1:
The system segments the substrate processing by implementing precise gap control at multiple measurement points across the substrate surface. The gap control system divides the deposition chamber into zones with controlled gap distances, allowing ALD processes to maintain superior step coverage and uniformity while improving overall throughput through optimized localized deposition parameters
2Manufacturing precision
If the gap between injector and susceptor is tightly controlled to meet composition and thickness uniformity, then manufacturing precision is improved, but device complexity increases due to the need for multiple sensors and actuators
Solution Approach 1:
The gap control system employs multi-functional components where actuators serve both as positioning mechanisms and as integrated sensor mounts. The same actuator that adjusts gap distance also holds the capacitance sensor, eliminating the need for separate sensor mounting structures and reducing overall system complexity while maintaining precise composition and thickness uniformity
3Measurement precision
If multiple measurement points are used to monitor gap uniformity across large wafers, then measurement precision is improved, but device complexity increases due to additional sensors and data processing requirements
Solution Approach 1:
The system merges the gap measurement function with the existing actuator structures. Capacitance sensors are integrated directly onto the actuator bodies, allowing multiple measurement points to be established without adding separate sensor assemblies. This integration approach maintains high measurement precision for gap uniformity while significantly reducing device complexity by combining multiple functions into unified components
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 solution enables accurate and reproducible gap control across large temperature ranges, enhancing process uniformity and throughput, thereby improving the economic feasibility of ALD processes by maintaining optimal wafer placement and gap control during substrate processing.
Implementation Method 1
The implementation of a system comprising a hardstop, actuator, and emitter-detector configuration that measures and adjusts the gap between the gas distribution assembly and the susceptor assembly using light attenuation
Implementation Method 2
An actuator has a body with an upper portion with an upper end and a lower portion with a lower end
Data Source
AI summary
Apparatus and methods for measuring the proximity between two components using a hardstop, an actuator and an emitter/detector passing light through a passage in the actuator are disclosed. The passage provides attenuation to the light which changes as the gap between the components changes allowing the measurement and control of the gap. Methods of determining the topology of the components using the apparatus are also described.