Single RF Source Switching Between CCP and ICP Plasma Modes
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Solution Overview
Problem
Existing plasma processing systems require separate RF sources for generating capacitively coupled plasmas during substrate processes and inductively coupled plasmas during cleaning processes, which increases complexity and costs.
Innovation Solution
A system utilizing a single Radio Frequency (RF) source that can generate both capacitively coupled plasmas and inductively coupled plasmas by adjusting the RF signal characteristics and routing it through appropriate matching circuits and electrodes or inductive coils, depending on the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate RF sources are used for generating capacitively coupled plasmas and inductively coupled plasmas, then the plasma processing system can perform both substrate processes and cleaning processes, but the system complexity and costs increase
Solution Approach 1:
The patent applies the universality principle by designing a single RF source that can perform multiple functions - generating both capacitively coupled plasmas for substrate processing and inductively coupled plasmas for cleaning processes. The RF source is configured with switching circuitry that enables it to operate in different modes (capacitive or inductive) depending on the process requirements, thereby eliminating the need for separate RF sources while maintaining full functional capability
Solution Approach 2:
The patent merges the functions of separate RF sources into a single unified RF source. By combining the capacitive and inductive plasma generation capabilities into one device with shared components (power amplifier, frequency synthesizer, control logic), the system reduces component count and interconnections, directly addressing the technical contradiction by lowering device complexity while preserving adaptability
2Adaptability or versatility
If separate RF sources are used for generating capacitively coupled plasmas and inductively coupled plasmas, then the plasma processing system can perform both substrate processes and cleaning processes, but the costs increase
Solution Approach 1:
The unified RF source design reduces manufacturing costs by eliminating redundant components. Instead of procuring and integrating two separate RF sources, the system uses one multi-functional unit with shared critical components (power amplifier, frequency synthesizer, housing, cooling systems), directly reducing bill of materials costs while maintaining the capability to perform both substrate and cleaning processes
Solution Approach 2:
By merging separate RF sources into a single integrated unit, the patent reduces assembly complexity and manufacturing steps. The combined design requires fewer installation procedures, less calibration work, and simplified integration with the plasma processing chamber, thereby reducing both direct manufacturing costs and indirect labor costs
3Device complexity
If a single RF source is used to generate both capacitively coupled plasmas and inductively coupled plasmas, then the system complexity is reduced, but the RF source must be highly adaptable to different operating modes
Solution Approach 1:
The RF source incorporates dynamic switching capability that allows it to adapt its operating mode based on process requirements. The switching circuitry can dynamically reconfigure the RF output impedance and coupling method (capacitive or inductive) without requiring physical reconfiguration, enabling the single RF source to handle both substrate processing and cleaning processes with different plasma coupling requirements
Solution Approach 2:
The patent employs parameter changes to enable the RF source to operate in different modes. By adjusting key parameters such as output impedance, frequency, and power level based on the desired plasma coupling mode, the single RF source can effectively generate both capacitively coupled and inductively coupled plasmas. The control system automatically modifies these parameters according to the selected process mode
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 simplifies the plasma processing system, reduces the need for multiple RF sources, and enhances operational efficiency by enabling the same RF source to handle both substrate processing and cleaning processes.
Implementation Method 1
causing the RF source to generate a first RF signal configured to generate a capacitively coupled plasma in the plasma processing chamber
Implementation Method 2
causing the RF source to generate a second RF signal configured to generate an inductively coupled plasma in the plasma processing chamber
Implementation Method 3
the application of radio frequency (RF) energy to the reaction zone proximate the substrate surface can create a plasma of highly reactive ionic species
Data Source
AI summary
A radio frequency (RF) source may be used to generate a capacitively coupled plasma to perform a plasma-based process on a substrate in a plasma processing chamber. A controller may cause the RF source and a switching element to route an RF signal to electrodes in the pedestal that generate the plasma in the processing chamber as part of a recipe performed on a substrate during etch or deposition processes. Between processes, the controller may cause the same RF source to generate a second RF signal that is instead routed by the switching element to inductive coils to generate an inductively coupled plasma for a cleaning process to remove film deposits on the interior of the plasma processing chamber.