Plasma Process Control Program for Dynamic Parameter Adjustment
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Solution Overview
Problem
Current plasma processing methods lack flexibility and accuracy in controlling process parameters, particularly during transitions between steps, leading to unstable plasmas and unexpected results due to instantaneous changes in conditions.
Innovation Solution
A method for generating a control program that allows for fine adjustments of process parameters over discrete times within each step and during transition periods, using an interactive display device to modify control data and define transition behaviors, ensuring non-instantaneous changes and improved control over plasma processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If process parameters are changed instantaneously between steps, then process time is reduced, but plasma stability deteriorates and unexpected results occur
Solution Approach 1:
The patent applies dynamics by transitioning from static stepwise parameter changes to dynamic continuous parameter adjustment. The control program divides each process step into multiple discrete time points, allowing parameters to change progressively rather than instantaneously. This dynamic approach maintains plasma stability while reducing overall process time by optimizing the timing and rate of parameter transitions.
Solution Approach 2:
The patent segments each process step into multiple discrete time points where parameters are controlled at different stages. Instead of treating each step as a single uniform condition, the method breaks down the step into temporal segments, allowing for controlled transitions between parameter values. This segmentation enables smooth parameter changes that maintain plasma stability while achieving faster overall processing.
2Device complexity
If stepwise process programs are used, then process control is simplified, but flexibility and accuracy in controlling process parameters are reduced
Solution Approach 1:
The patent transforms static stepwise programs into dynamic control programs that continuously adjust parameters throughout each step. By implementing time-dependent parameter control with multiple discrete time points, the system gains flexibility to adapt process conditions at different stages without significantly increasing program complexity. This dynamic approach enables precise control of plasma processes while maintaining manageable program structure.
Solution Approach 2:
The patent applies parameter changes by controlling process parameters at multiple discrete time points within each step rather than maintaining constant values. This allows parameters such as gas flow rates, power levels, and pressure to be optimized at different stages of each step, providing greater flexibility and accuracy in process control while keeping the program structure organized and manageable.
3Manufacturing precision
If multiple discrete control points are used within each step, then control precision is improved, but program complexity increases
Solution Approach 1:
The patent segments each process step into multiple discrete time points for parameter control, enabling precise control at critical moments during each step. By strategically placing control points at key stages rather than uniformly distributing them, the method achieves high control precision without unnecessarily increasing program complexity. This selective segmentation allows for accurate parameter management where it matters most.
Solution Approach 2:
The patent implements parameter changes at multiple discrete time points within each step, allowing precise control of process parameters during transitions and at critical process stages. This approach achieves high manufacturing precision by optimizing parameters at specific moments while maintaining a structured program organization that prevents excessive complexity through systematic parameter management.
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 provides enhanced control over plasma processes, reducing instability and improving process outcomes by allowing precise adjustments of parameters and transition management, thus achieving more accurate and flexible plasma processing.
Implementation Method 1
RF (radio frequency) power is applied to one or more electrodes in the chamber (or other plasma sources connected to the chamber) to create a plasma
Implementation Method 2
create a plasma and to apply electrical bias (if necessary) to the wafer or certain other parts of the chamber. Typically, this results in the desired etching and/or deposition at the wafer surface
Implementation Method 3
Plasma-based processing typically involves evacuating a process chamber in which a substrate such as a wafer to be processed, is mounted
Data Source
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Figure 3
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AI summary
A method is provided of generating and using a control program for a plasma process. The method comprises obtaining predetermined process data defining, in a series of time steps, changes in at least one control parameter for the plasma process during the said process. Control data are generated' from the process data, the control data defining the at least one control parameter at a plurality of discrete times within each step. The control data are presented graphically to a user, using an interactive display device. The control data are modified in response to the operation by the user of the interactive display device, so as to generate the control program.