Process Chamber Cleaning With Dynamic Gas Zoning Feedback
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Solution Overview
Problem
Conventional methods for cleaning semiconductor process chambers are inefficient, often leading to over or under cleaning, which can damage chamber components or result in deposition particles flaking off, due to reliance on human observation of visible light for end-point detection and lack of control over gas flow and distribution.
Innovation Solution
A system with a dynamic gas assist and sensor feedback system that monitors light intensity to adjust gas flow distribution and direction in real-time, allowing for precise control of cleaning gas conditions and distribution within different zones of the process volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cleaning methods with inert or reactive cleaning gases are used, then cleaning is performed, but the cleaning level is insufficient and can cause damage to chamber components
Solution Approach 1:
The system employs a sensor to detect light intensity changes that indicate the presence of deposits on chamber components. This feedback signal is used to dynamically adjust the cleaning gas flow rate and distribution, ensuring cleaning is applied only when and where needed, thereby improving cleaning effectiveness while preventing damage from excessive or unnecessary cleaning.
Solution Approach 2:
The cleaning system transitions from static, fixed gas flow rates to dynamic, real-time adjustment of gas flow based on sensor feedback. The gas flow rate and distribution are continuously modified during the cleaning process to match the actual deposit conditions, enabling precise control that enhances cleaning while avoiding component damage.
2Reliability
If conventional cleaning methods are used, then cleaning is performed, but deposits may flake off and cause contamination
Solution Approach 1:
The sensor continuously monitors the cleaning process by detecting light intensity changes. When deposits are fully removed or begin to flake, the sensor signal changes, providing feedback to adjust or terminate cleaning gas flow. This prevents over-cleaning that would cause deposit flaking and subsequent particulate contamination.
Solution Approach 2:
The system uses the optical properties of the chamber environment itself as the sensing mechanism. The sensor detects changes in light intensity caused by the presence or absence of deposits, allowing the cleaning process to self-regulate based on real-time conditions without requiring external inspection or intervention.
3Reliability
If uniform cleaning gas distribution is achieved, then cleaning effectiveness is improved, but control over gas flow to different zones is reduced
Solution Approach 1:
The gas distribution system is divided into multiple independent zones with separate flow control. Each zone can receive cleaning gas at different flow rates based on local deposit conditions detected by sensors, enabling both uniform cleaning across the chamber and targeted adjustment to specific areas that require additional or reduced cleaning.
Solution Approach 2:
The system applies different cleaning gas flow rates and compositions to different zones of the chamber based on local deposit conditions. Sensors in each zone provide localized feedback, allowing the gas distribution system to adapt its characteristics (flow rate, timing) to match the specific cleaning needs of each area, achieving both uniformity and zone-specific control.
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 approach ensures uniform and efficient cleaning, reducing the amount of cleaning gas used, preventing damage to chamber components, and enhancing cleaning effectiveness by dynamically controlling gas flow and end-point detection.
Implementation Method 1
A sensor is coupled to the process chamber and is configured to monitor at least one characteristic of the volume of the process chamber
Implementation Method 2
Removal of process chamber deposits is achieved through introduction of inert or reactive cleaning gases which can chemically react or bombard with surface film deposits
Data Source
AI summary
Embodiments described herein relate to process systems for cleaning semiconductor process chamber components. In one example, a process system include a process chamber having process chamber components. The process chamber components include a substrate support disposed within a chamber volume of the process chamber. A gas distribution assembly faces the substrate support. A gas baffle is fluidly coupled to the gas distribution assembly. A sensor system is coupled to the process chamber and is configured to monitor at least one characteristic of the volume of the process chamber. A dynamic gas assist is fluidly coupled to the gas baffle and is communicatively coupled to the sensor.