Programmable Plasma Ignition Waveforms for Repeatable Chamber Startup
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Solution Overview
Problem
Existing plasma ignition systems face challenges in achieving consistent and repeatable ignition due to various variables such as gas pressure, chamber size, and substrate type, with current approaches being inadequate in accommodating these variations.
Innovation Solution
A programmable ignition profile generator that creates customized voltage waveforms based on specific voltage values and dwell times, allowing for the identification of optimal ignition voltages less than the maximum plasma chamber voltage, enabling fast and repeatable plasma ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional plasma ignition methods are used, then plasma can be ignited in the chamber, but the ignition process is inconsistent and non-repeatable due to variations in gas pressure, chamber size, and substrate type
Solution Approach 1:
The system dynamically adjusts the ignition voltage waveform parameters (peak voltage, pulse width, rise time) based on real-time feedback from plasma ignition sensors and process conditions. This allows the ignition profile to adapt to variations in gas pressure, chamber size, and substrate type, ensuring consistent ignition across different operating conditions.
Solution Approach 2:
The patent implements programmable ignition profiles that modify voltage waveform parameters (amplitude, duration, shape) to optimize ignition for specific process conditions. By changing these electrical parameters based on detected conditions, the system achieves reliable ignition while accommodating process variations.
2Reliability
If higher voltage is applied to ensure plasma ignition, then ignition reliability improves, but the risk of damaging the plasma chamber or components increases
Solution Approach 1:
The system uses periodic voltage pulses with controlled duration and frequency to ignite plasma. By applying voltage in controlled periodic bursts rather than continuous high voltage, the system achieves reliable ignition while limiting the total energy exposure to chamber components, reducing damage risk.
Solution Approach 2:
The system performs preliminary detection of process conditions (gas pressure, chamber state) before applying ignition voltage. This preliminary action allows the system to pre-calculate optimal ignition parameters that achieve reliable ignition while staying within safe voltage limits, preventing component damage.
3Ease of operation
If fixed ignition voltage profiles are used, then the system is simple to operate, but it cannot accommodate variations in gas pressure, chamber size, and substrate type
Solution Approach 1:
The system automatically detects process conditions (gas pressure, chamber state) and self-adjusts ignition voltage parameters without requiring manual operator intervention. This self-service capability maintains ease of operation while achieving high adaptability to different process conditions through automated profile selection and parameter adjustment.
Solution Approach 2:
The system incorporates feedback from sensors that monitor plasma ignition status and process conditions. This feedback is used to automatically adjust ignition voltage parameters in real-time, allowing the system to adapt to process variations while maintaining simple operation through automated control loops.
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
The solution enables the creation of tailored ignition profiles that ensure consistent and repeatable plasma ignition, even under varying conditions, by applying specific voltage levels and corresponding dwell times, which can be programmed by operators, improving the reliability of plasma processing systems.
Implementation Method 1
a power generator often creates an electric potential between a cathode and anode within the plasma chamber. This causes ignition of a processing gas into the plasma
Implementation Method 2
a power generator often creates an electric potential between a cathode and anode within the plasma chamber
Data Source
AI summary
Generators and methods for igniting a plasma in a plasma chamber are disclosed. The generator includes an ignition profile generator that includes a data interface configured to receive a specification for voltage as a function of time and an ignition data generator configured to create an ignition profile from the specification. The generator also includes an ignition profile datastore to store the ignition profile and a waveform generator configured to apply a waveform with the ignition profile to an output of the generator.