Plasma Power Control for Uniform Layer Thickness on Shaped Substrates
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Solution Overview
Problem
In plasma processing, unequal layer thicknesses are observed when processing multiple substrates in the same plasma chamber, particularly when substrates have different shapes or are not flat, leading to inconsistent treatment results.
Innovation Solution
A method and apparatus that adjust the output power of the power supply in a plasma chamber based on the distance between the electrode and the substrate, using a control system to synchronize power modulation with the position of the substrate carrier, ensuring uniform processing by varying power supply according to the substrate's topography and position relative to the electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a constant power supply is used for plasma processing, then the plasma process is simple to control, but unequal layer thicknesses occur on substrates with different shapes or positions
Solution Approach 1:
The power supply transitions from a static constant power mode to a dynamic variable power mode, where the output power is continuously adjusted based on the real-time position of the substrate carrier and the specific shape characteristics of the substrate being processed. This dynamic adaptation ensures uniform layer thickness across different substrate geometries and positions within the plasma chamber.
Solution Approach 2:
Different regions of the substrate receive different power levels tailored to their specific geometric characteristics and positions. The control system identifies the current substrate shape and carrier position, then applies locally optimized power settings to compensate for variations in surface area, curvature, and distance from the plasma source, ensuring uniform processing quality across the entire substrate surface.
2Manufacturing precision
If the power supply is adjusted frequently to accommodate different substrate positions and shapes, then layer thickness uniformity is improved, but the control system complexity and response time requirements increase
Solution Approach 1:
The control system automatically detects the substrate carrier position and substrate shape characteristics, then autonomously calculates and adjusts the optimal power supply settings without requiring manual intervention. The system self-regulates by continuously monitoring process parameters and adapting the power output in real-time, simplifying the operator's role while maintaining high precision.
Solution Approach 2:
The control system incorporates real-time feedback from position sensors and process monitoring devices to continuously adjust the power supply output. The system measures the actual carrier position and substrate geometry, compares it with the desired processing parameters, and automatically corrects power delivery to maintain optimal layer thickness uniformity throughout the processing cycle.
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 ensures uniform layer thickness on substrates by dynamically adjusting power supply based on the distance and position, improving the consistency and quality of plasma processing, even for substrates with varying shapes or gaps, thereby enhancing the precision and reliability of the plasma processing results.
Implementation Method 1
maintaining a plasma in a plasma chamber by the electrical power
Data Source
AI summary
A method adjusts an output power of a power supply supplying electrical power to a plasma in a plasma chamber. The method includes: connecting the power supply to at least one electrode in the plasma chamber; transporting one or more substrates relative to the electrode using a substrate carrier; maintaining the plasma by the electrical power; processing the one or more substrates with the plasma; and adjusting the output power based on a parameter related to a distance between a surface of the electrode facing a carrier-substrate-assembly and a surface of the substrate-carrier-assembly facing the electrode.