Broadband RF Plasma Chamber for Fast Etch-Deposition Switching
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Solution Overview
Problem
Conventional plasma processing systems require separate chambers for etching and deposition processes, leading to increased processing time due to the need for wafer transfer between different chambers, and complex hardware configurations due to different radio frequencies used for these processes, which complicates tuning and reduces efficiency.
Innovation Solution
A single-chamber plasma processing system utilizing a broadband power amplifier with an electronic feedback control system for ultrafast impedance matching, allowing for quick toggling between etch and deposition processes by generating and amplifying tunable RF signals at multiple frequencies and adjusting the output matching network to optimize power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate chambers are used for etching and deposition processes, then each process can be optimized independently, but processing time increases due to wafer transfer between chambers
Solution Approach 1:
The patent combines etching and deposition processes into a single plasma processing chamber, eliminating the need for wafer transfer between separate chambers. This merging of previously separate processing chambers into one integrated chamber allows both etching and deposition to be performed without physical transfer, directly reducing processing time while maintaining process optimization through separate RF frequency control.
2Reliability
If different radio frequencies are used for etching and deposition processes, then each process can operate at optimal frequency, but hardware complexity increases due to multiple frequency requirements
Solution Approach 1:
The patent employs a universal broadband power amplifier capable of operating across a wide frequency range (e.g., 2 MHz to 100 MHz) to power both etching and deposition processes. This single multi-functional amplifier replaces what would traditionally require separate frequency-specific amplifiers, reducing hardware complexity while allowing each process to operate at its optimal frequency within the amplifier's broad operating range.
Solution Approach 2:
The system dynamically adjusts the RF frequency based on the required process type. The power amplifier and matching network are designed to rapidly tune between different frequencies, allowing the system to switch between etching and deposition modes by changing operational parameters rather than physical configuration, thereby simplifying hardware while maintaining process-specific optimization.
3Reliability
If separate chambers are used for different processes, then process-specific optimization is achieved, but equipment cost and footprint increase
Solution Approach 1:
The patent merges multiple process chambers into a single integrated plasma processing chamber that can perform both etching and deposition. This consolidation reduces the total equipment footprint and eliminates redundant chamber infrastructure while maintaining process-specific optimization through frequency-based process control and appropriate electrode configuration within the shared chamber.
4Reliability
If separate chambers are used for etching and deposition, then process isolation is maintained, but productivity decreases due to wafer transfer requirements
Solution Approach 1:
The patent combines etching and deposition capabilities in a single chamber, eliminating wafer transfer operations and directly improving productivity. Process isolation is maintained through frequency-based plasma control and selective electrode activation, allowing sequential or alternating etching and deposition cycles without physical chamber separation, thereby removing the productivity bottleneck of wafer transfer while preserving process-specific control.
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 solution enables efficient and rapid switching between etching and deposition processes, reducing processing time and complexity by using a single chamber for both operations, while maintaining high power transfer efficiency through dynamic frequency tuning and impedance matching.
Implementation Method 1
at a broadband power amplifier, amplifying the RF signal to generate an amplified RF signal
Implementation Method 2
generating a radio frequency (RF) signal at tunable RF signal generator
Implementation Method 3
supplying the amplified RF signal to power a plasma within a plasma processing chamber
Implementation Method 4
generating a feedback signal by measuring an impedance of the plasma
Data Source
AI summary
An exemplary plasma processing system includes a plasma processing chamber, an electrode for powering plasma in the plasma processing chamber, a tunable radio frequency (RF) signal generator configured to output a first signal at a first frequency and a second signal at a second frequency. The second frequency is at least 1.1 times the first frequency. The system includes a broadband power amplifier coupled to the tunable RF signal generator, the first frequency and the second frequency being within an operating frequency range of the broadband power amplifier. The output of the broadband power amplifier is coupled to the electrode. The broadband power amplifier is configured to supply, at the output, first power at the first frequency and second power at the second frequency.