Processing Reactor Control for Synchronized Recipe Transitions
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Solution Overview
Problem
Conventional substrate processing chamber control systems face challenges in synchronized control of parameters like power, temperature, and pressure due to different time constants and lack of communication between sub-systems, leading to potential damage from unsynchronized transitions and time delays.
Innovation Solution
A system with a controller that compares recipe information with feedback from sub-systems, using empirical data to adjust parameters and mitigate non-linear behavior, ensuring synchronized control of power, pressure, and gas flow, thereby preventing damage and improving dynamic response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If independent control systems are used for each subsystem, then each subsystem can be controlled independently, but the time delay between subsystems increases and can lead to damage to the processing chamber
Solution Approach 1:
The patent merges the control of multiple independent subsystems (gas flow, pressure, RF power) into a unified control architecture where a central controller coordinates all subsystems. This integration eliminates the time delays and synchronization issues that occur when subsystems operate independently, as the central controller manages the timing and sequencing of all parameter changes simultaneously or in the correct temporal sequence.
Solution Approach 2:
The system performs preliminary actions by pre-calculating and pre-coordinating the sequence of parameter changes before execution. The control system determines the optimal timing for each subsystem's parameter change in advance, ensuring that fast-responding subsystems (like RF power) are adjusted before slow-responding subsystems (like pressure), preventing harmful transient states from occurring.
2Productivity
If sequential recipe execution is used from one step to another, then each parameter can be changed in order, but unsynchronized transitions create wrong combinations of power, pressure, and gas
Solution Approach 1:
The control system dynamically adjusts the timing and sequencing of parameter changes based on the specific recipe requirements and subsystem response characteristics. Rather than using fixed sequential steps, the system adaptively coordinates parameter transitions to ensure that each combination of power, pressure, and gas flow is synchronized appropriately for the desired process outcome, eliminating wrong parameter combinations.
Solution Approach 2:
The system implements feedback mechanisms where the actual state of each subsystem is continuously monitored and compared against the desired state. This feedback allows the control system to detect and correct unsynchronized transitions in real-time, ensuring that parameter combinations remain within acceptable ranges throughout the recipe execution, thereby improving manufacturing precision.
3Adaptability or versatility
If different time constants of subsystems are accommodated, then each subsystem can operate at its optimal speed, but the overall system response time increases
Solution Approach 1:
The control system utilizes parameter changes in the timing and sequencing of commands to accommodate different subsystem time constants. By adjusting when each subsystem receives its control signal based on its known response characteristics, the system allows each subsystem to operate at its optimal speed while maintaining coordinated overall performance. Fast subsystems receive commands earlier, while slow subsystems receive commands later in the sequence.
Data Source
AI summary
Methods and systems for processing substrates are provided. The system can include: a processing chamber configured to process a substrate based on a recipe; a plurality of sub-systems in operable communication with the processing chamber for controlling corresponding parameters associated with processing the substrate; and a controller in operable communication with the processing chamber and each of the plurality of sub-systems and configured to control each of the plurality of sub-systems and the processing chamber using information included in the recipe and feedback provided by at least one of the plurality of sub-systems. The controller is configured to compare information included in the recipe and feedback provided by at least one of the plurality of sub-systems with stored empirical information relating to the recipe and each of the plurality of sub-systems, and adjust at least one of the corresponding parameters associated with processing the substrate based on a determined comparison.