Plasma Distribution Feedback Control for Uniform Substrate Processing
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Solution Overview
Problem
Existing plasma processing technologies face challenges in achieving uniform plasma distribution on substrate surfaces, leading to variations in processing conditions and inefficiencies in etching and chip singulation processes.
Innovation Solution
A plasma processing apparatus and method that includes a measurement unit to assess plasma distribution, a control unit to adjust process conditions, and a modification unit to correct non-uniformities, ensuring uniform plasma distribution by modifying parameters such as power distribution and gas flow rates based on real-time measurement data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plasma processing is used without real-time measurement and adjustment, then the process is simple and fast, but the plasma distribution uniformity is poor leading to processing variations
Solution Approach 1:
The patent implements a feedback control system where a measurement unit continuously monitors plasma distribution characteristics in real-time, and a control unit adjusts process conditions based on measured data. This closed-loop feedback mechanism enables dynamic compensation for plasma non-uniformity, resolving the contradiction between maintaining simple processing and achieving uniform plasma distribution.
Solution Approach 2:
The system dynamically modifies plasma processing parameters (such as power distribution, gas flow rates) based on real-time measurement data. By continuously adjusting these parameters in response to measured plasma distribution, the system achieves uniform processing results without requiring complex fixed infrastructure, thus resolving the contradiction between precision and complexity.
2Productivity
If fixed process conditions are used for plasma processing, then the operation is simple, but the processing efficiency varies due to plasma distribution non-uniformity
Solution Approach 1:
The patent transitions from static fixed process conditions to dynamic adaptive control. The system continuously measures plasma distribution and automatically adjusts process parameters in real-time, enabling the processing conditions to adapt dynamically to actual plasma states. This improves processing efficiency by optimizing conditions based on actual plasma uniformity while maintaining operational simplicity through automation.
Solution Approach 2:
The system performs self-optimization by automatically measuring its own plasma distribution characteristics and adjusting its process conditions without external intervention. This self-service capability improves processing efficiency through continuous optimization while keeping the operation simple for the user, as the system handles the complex adjustments autonomously.
3Manufacturing precision
If plasma distribution is not monitored and adjusted, then the process setup is straightforward, but etching uniformity and chip singulation quality deteriorate
Solution Approach 1:
The system performs preliminary measurement of plasma distribution characteristics before the actual processing begins. This preliminary action allows the control unit to pre-adjust process conditions to compensate for anticipated non-uniformities, ensuring etching uniformity and chip singulation quality are optimized before processing starts, thus avoiding quality deterioration without requiring extensive setup time.
Solution Approach 2:
The patent replaces manual setup and adjustment procedures with automated measurement and control systems. By using sensors and control algorithms to automatically determine and adjust optimal processing conditions, the system achieves high etching uniformity while minimizing the time required for process setup, resolving the contradiction between precision and setup time.
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 significantly reduces variations in processing conditions, enhancing the uniformity of plasma distribution and improving the efficiency of etching and chip singulation processes by dynamically adjusting parameters in response to measured plasma distribution data.
Implementation Method 1
a plasma generation unit configured to generate a plasma within the chamber
Implementation Method 2
a plasma processing method in which a unit processing with respect to a substrate is repeated using a plasma generated by application of a high-frequency power to a raw material gas
Data Source
AI summary
A plasma processing apparatus including a chamber, a placement unit which is disposed in the chamber and on which a substrate is to be placed, a plasma generation unit configured to generate a plasma within the chamber, a gas supply unit configured to supply a raw material gas of the plasma into the chamber, a measurement unit configured to measure and output a distribution information regarding a plasma distribution in the chamber, a control unit configured to control the plasma generation unit and the gas supply unit so as to repeat a unit processing on the substrate, a memory unit configured to store process conditions including conditions for the unit processing, and a modification unit configured to modify the process conditions. The measurement unit measures the distribution information (N) in the unit processing (N) at an Nth time, where N is an integer. When the distribution information (N) satisfies a predetermined condition, the modification unit modifies the process conditions in the unit processing (M) at an Mth time, where M is any integer equal to or greater than (N+1).