RF-Microwave Plasma Coupling for Wafer Uniformity Control
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Solution Overview
Problem
Current plasma processing technologies face challenges in achieving accurate feature sizing, precise placement, and tight control at atomic scale dimensions, particularly in high volume IC manufacturing, due to the need for uniformity and repeatability in patterning semiconductor wafers with shrinking feature sizes.
Innovation Solution
A plasma processing system that combines radio frequency (RF) and microwave power using an electromagnetic metasurface to ignite, sustain, and control plasma, allowing for adjustable spatial uniformity of the combined electromagnetic power, thereby enhancing the uniformity of plasma distribution and characteristics on semiconductor wafers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional plasma processing technologies are used, then the processing capability is maintained, but the uniformity and precision of plasma distribution on semiconductor wafers deteriorates as feature sizes shrink
Solution Approach 1:
The patent combines two different plasma ignition methods (RF and microwave) into a single hybrid system. The RF electrode and microwave antenna work together to generate plasma, allowing the system to leverage the advantages of both methods: RF provides good plasma uniformity while microwave enables higher power density and better spatial control, thereby improving both manufacturing precision and plasma uniformity simultaneously
Solution Approach 2:
The system dynamically adjusts multiple parameters including RF power level, microwave power level, gas flow rates, and pressure to optimize plasma characteristics. By changing these parameters, the system can maintain stable plasma uniformity across different processing conditions and achieve precise feature sizing required for advanced semiconductor nodes
2Manufacturing precision
If conventional single-power-source plasma systems are used, then the system complexity is low, but the control precision and spatial uniformity of plasma power distribution deteriorates
Solution Approach 1:
The hybrid plasma system applies different power densities to different regions of the plasma chamber. The microwave antenna can be positioned and controlled to deliver localized power to specific areas, while the RF electrode provides broader coverage. This local quality approach enables precise spatial uniformity control without requiring overly complex system architecture
Solution Approach 2:
The system incorporates sensors and control mechanisms that monitor plasma characteristics in real-time and adjust RF and microwave power levels accordingly. This feedback control enables the complex dual-power system to maintain optimal performance and spatial uniformity automatically, reducing the practical operational complexity despite the increased hardware complexity
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 system achieves more uniform plasma and spatially uniform characteristics on semiconductor wafers, improving the precision and consistency of plasma processing, which is crucial for advanced semiconductor fabrication.
Implementation Method 1
igniting plasma by coupling RF power from the RF source electrode to gas in the plasma processing chamber
Implementation Method 2
coupling microwave power from the microwave power system to a plasma ignited in the plasma processing chamber by coupling the microwave oscillator to the microwave source
Implementation Method 3
an electromagnetic (EM) metasurface having a major surface electromagnetically coupled to the microwave source, the major surface configured to couple microwave power to the plasma
Data Source
AI summary
A plasma processing system includes a vacuum system, a plasma processing chamber including a chamber cavity coupled to the vacuum system, a substrate holder including a surface inside the chamber cavity, a radio frequency (RF) source electrode coupled to an RF power source, the RF source electrode configured to ignite plasma in the chamber cavity. The system includes microwave source coupled to a microwave oscillator, and an electromagnetic (EM) metasurface, where the EM metasurface having a major surface electromagnetically coupled to the microwave source, the major surface configured to couple microwave power to the plasma in the chamber cavity.