Dual-Level Pulse Tuning for Plasma Processing
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Solution Overview
Problem
The challenge in semiconductor processing is accurately tuning dual level pulsed RF power in process chambers, which is crucial for forming high aspect ratio features and maximizing energy efficiency during plasma processes, but current methods struggle with precise impedance matching and frequency adjustment at high frequencies.
Innovation Solution
A tuning system comprising a controller connected to a matching network and RF power generator, which adjusts and stores the last known tuned frequencies and power levels to minimize reflected power and optimize impedance matching, allowing for efficient dual level pulsed RF power delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If dual level pulsed RF power is used to form plasma, then energy efficiency is improved, but frequency tuning precision deteriorates
Solution Approach 1:
The patent segments the RF power delivery into two distinct pulse levels (first and second power states), each with independently tunable frequencies. This allows separate optimization of frequency tuning for each power state, resolving the contradiction by enabling precise frequency control at both low and high power levels while maintaining energy efficiency through pulsed operation.
Solution Approach 2:
The patent dynamically changes RF frequency parameters based on the power state. The system adjusts the first frequency during the first power state and the second frequency during the second power state, allowing optimization of plasma coupling at each power level. This parameter adaptation enables precise frequency tuning despite the complexity of dual-level pulsing.
2Productivity
If dual level pulsed RF power is used, then plasma formation efficiency is improved, but impedance matching complexity increases
Solution Approach 1:
The patent implements dynamic impedance matching by adjusting matching network parameters independently for each power state. The system adapts the impedance matching configuration based on whether the first or second power state is active, enabling efficient plasma formation at both power levels while managing the complexity through state-dependent control strategies.
Solution Approach 2:
The patent employs feedback mechanisms to monitor and adjust impedance matching in real-time for each power state. By measuring plasma conditions and RF power delivery characteristics, the system automatically adjusts matching network parameters to maintain optimal impedance matching during transitions between power states, reducing the operational complexity despite the dual-level configuration.
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 precise tuning of RF power levels and frequencies, reducing power reflection and enhancing energy coupling to the plasma, thereby improving the formation of high aspect ratio features and increasing processing efficiency in semiconductor manufacturing.
Implementation Method 1
The power from a radio frequency (RF) power source may be coupled through a dynamically tuned matching network (also referred to as a match unit) to an antenna or electrode within the processing chamber. The power is coupled from the antenna or electrode to process gases within the processing chamber to form the plasma
Implementation Method 2
The power is coupled from the antenna or electrode to process gases within the processing chamber to form the plasma that is used for the plasma process
Data Source
AI summary
Embodiments for the present application include methods and apparatus for operating a plasma enhanced substrate processing system using dual level pulsed radio frequency (RF) power. More specifically, embodiments of the present disclosure allow for frequency and power tuning in a process chamber using dual level pulsed power by using a tuning controller coupled to a matching network and/or a RF power generator. In one embodiment, a tuning system includes a tuning controller disposed in a tuning system, the tuning controller configured to tune dual level RF pulsing data from a RF power generator, wherein the tuning system is connectable to a plasma processing chamber, and a memory connecting to the tuning controller, wherein the tuning controller is configured to couple to a RF power generator and a matching network disposed in the plasma processing chamber.