Real-Time In-Situ Detection of Dry Etch Byproduct Sublimation
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Solution Overview
Problem
Current dry chemical etching processes lack a real-time method to determine the complete sublimation of etch byproduct layers, leading to inefficiencies in process control, throughput, and yield improvements.
Innovation Solution
Implementing a real-time in-situ process to determine the completion of post heat treatment (PHT) of dry etch byproduct layers using etch endpoint equipment and methods, which involves measuring properties of the byproduct layer and adjusting the PHT process accordingly to ensure uniform removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If empirical timed method is used to estimate complete sublimation of byproduct layer, then process simplicity is maintained, but measurement precision and reliability of process completion determination deteriorate
Solution Approach 1:
The patent replaces the mechanical/timed estimation method with an optical detection system. Optical sensors and interferometry techniques are used to detect the presence and removal of byproduct layers in real-time, substituting the empirical timed approach with precise optical measurement that can accurately determine process completion without relying on predetermined time schedules
Solution Approach 2:
The patent implements real-time feedback mechanisms where optical detection systems continuously monitor the byproduct layer during PHT processing. The system provides feedback signals that indicate when the byproduct layer has been completely removed, allowing for dynamic adjustment and precise termination of the heating process based on actual process state rather than predetermined timing
2Measurement precision
If real-time in-situ process is implemented to determine complete sublimation, then measurement precision and process control improve, but device complexity increases
Solution Approach 1:
The patent integrates multiple functions into a single PHT system. The heating system simultaneously performs thermal processing and optical measurement functions, while the control system manages both heating parameters and optical detection data. This multi-functionality reduces the need for separate dedicated equipment and simplifies the overall system architecture despite the advanced capabilities
Solution Approach 2:
The patent uses optical fields as intermediaries to detect byproduct layer removal without direct physical contact or complex mechanical probes. The optical detection system acts as an intermediary that translates physical changes in the byproduct layer into measurable signals, enabling precise monitoring through a non-invasive intermediate medium rather than direct measurement
3Device complexity
If empirical timed method is used for byproduct layer removal, then device complexity is low, but productivity and throughput are reduced due to lack of real-time control
Solution Approach 1:
The real-time optical detection system provides immediate feedback on byproduct layer removal status, enabling the system to terminate heating as soon as complete removal is detected. This eliminates unnecessary extended heating cycles and allows for optimized processing times that maximize throughput while maintaining quality, directly addressing the productivity limitation of empirical timed methods
Solution Approach 2:
The patent transitions from static predetermined timing to dynamic real-time process control. The system continuously adapts the heating process based on real-time optical detection data, adjusting processing duration and parameters dynamically to match actual process conditions. This dynamic approach optimizes each processing cycle individually, improving overall productivity compared to fixed timed schedules
4Reliability
If real-time in-situ detection is implemented, then process control and yield improvement are enhanced, but ease of operation decreases due to increased monitoring requirements
Solution Approach 1:
The system incorporates automated interpretation and decision-making capabilities that allow the process to self-regulate based on optical detection data. The control system automatically determines when byproduct layer removal is complete and adjusts processing parameters without requiring constant operator intervention or complex manual monitoring, maintaining ease of operation while achieving improved reliability through real-time detection
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 enhances process control, increases tool throughput, and reduces variability in PHT, resulting in improved substrate processing and reduced defects.
Implementation Method 1
complete sublimation of etch byproduct layers
Data Source
AI summary
Provided is a method for determining and utilizing process completion of post heat treatment (PHT) of a dry etch process, the method comprising: providing a substrate in a process chamber, the substrate having a film layer and an underlying layer, the film layer having one or more regions; performing a dry etch process to remove the film layer or region of the film layer, the dry etch process generating a byproduct layer; measuring one or more properties of the byproduct layer; adjusting the PHT process based on the measured one or more properties of the byproduct layer; and performing the PHT process to remove the byproduct layer on the substrate; wherein the PHT process utilizes a real time in-situ process to concurrently determine when removal of the byproduct layer is complete.