Real-Time Pulse Timing Adjustment for Uniform Pulsed Plasma
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Solution Overview
Problem
Conventional plasma processing systems face challenges in maintaining uniform plasma distribution and optimal plasma density, particularly as substrate geometries shrink, due to inadequate control over plasma properties such as density, ion flux, and energy, which affects the quality and throughput of microelectronic and micromechanical device processing.
Innovation Solution
The system dynamically controls pulse timing parameters of the plasma generation source based on real-time measurement data from various devices, allowing for adjustments in pulse on-time, pulse off-time, and chamber pressure to maintain specified plasma properties during the process, using both feedforward and feedback control methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hardware and processing techniques are used, then plasma processing can be performed, but plasma distribution uniformity and plasma density control are insufficient
Solution Approach 1:
The patent implements real-time feedback control by measuring actual plasma properties (density, ion flux, energy) during the pulsed plasma process and dynamically adjusting pulse timing parameters based on these measurements. This closed-loop feedback mechanism enables precise control of plasma distribution uniformity and density without requiring overly complex hardware modifications.
Solution Approach 2:
The system dynamically adjusts pulse timing parameters (pulse width, pulse frequency, duty cycle) in real-time based on measured plasma conditions. This dynamic control approach allows the plasma processing system to adapt to changing substrate geometries and plasma conditions, maintaining uniform plasma distribution without fixed, complex hardware configurations.
2Manufacturing precision
If fixed plasma parameter settings are used, then the system architecture is simple, but plasma density and process performance are insufficient under certain conditions
Solution Approach 1:
Real-time measurement of plasma density and other plasma properties feeds back to the control system, which automatically adjusts pulse timing parameters to maintain optimal plasma density. This eliminates the need for manual parameter tuning and complex operational procedures while achieving precise plasma density control.
Solution Approach 2:
The plasma processing system performs self-adjustment by automatically modifying pulse timing parameters based on real-time plasma measurements. The system self-optimizes plasma density and distribution without requiring external intervention or complex operational procedures, improving both control precision and ease of operation.
3Reliability
If real-time pulse timing control is implemented, then plasma properties are precisely controlled, but system complexity increases
Solution Approach 1:
The system uses feedback control where real-time measurements of plasma properties (density, ion flux, energy) are continuously monitored and used to adjust pulse timing parameters. This feedback mechanism ensures reliable plasma property control while keeping the control system architecture relatively simple through automated closed-loop control.
Solution Approach 2:
The system controls plasma properties by dynamically changing pulse timing parameters (pulse width, frequency, duty cycle) in real-time based on measured plasma conditions. This parameter adjustment approach achieves reliable plasma control through software-based control rather than complex hardware modifications.
4Manufacturing precision
If conventional plasma control methods are used, then the system is easy to operate, but controllability of plasma properties is challenging
Solution Approach 1:
Real-time feedback from plasma measurements enables automatic adjustment of pulse timing parameters, achieving precise plasma property controllability without requiring complex manual operations. The feedback loop handles the complexity of parameter tuning automatically.
Solution Approach 2:
The system automatically adjusts plasma properties through self-service control mechanisms that modify pulse timing parameters based on real-time measurements. This eliminates the need for complex manual parameter adjustment while achieving high plasma property controllability.
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 enables precise control of plasma density, ion flux, and energy, improving the uniformity and stability of plasma fields, thereby enhancing the quality and efficiency of substrate processing in plasma etching and deposition processes.
Implementation Method 1
Plasma processing systems generate plasma by supplying high frequency electrical power to gas mixtures in a plasma process chamber to ionize the gases in the plasma process chamber
Data Source
AI summary
Various embodiments of systems and methods are described herein for controlling a pulsed plasma. Pulse timing parameters (e.g., the pulse on-time and/or the pulse-off time) of the plasma generation source may be controlled based on the measurement data received from measurement device(s), to control the plasma exposure of the substrate during a sequence of dynamically controlled pulses within the plasma process chamber. In addition or alternatively, pulse timing parameters (e.g., the pulse on-time and/or the pulse-off time) can be applied to the source power, bias power, and/or both based on the measurement data received from measurement device(s), to control a plasma exposure of the substrate. The pulse timing changes may be made in a feedforward or feedback manner.