Phase Angle Control for Plasma Uniformity
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Solution Overview
Problem
The increased size of substrates in electronic device manufacturing poses challenges in achieving uniform and consistent plasma processing results due to higher RF power requirements, leading to inefficiencies and equipment size/cost issues, particularly for substrates larger than 1 m^2.
Innovation Solution
A method and apparatus that involve delivering RF power through a match network to a capacitively coupled plasma chamber, measuring and adjusting phase angles of harmonic signals relative to the fundamental frequency, and adjusting impedance in the match network to promote consistent plasma processing, using configurations like π-network and T-network for improved impedance matching and phase control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If RF power is increased to process larger substrates, then processing capability is improved, but equipment size and cost increase
Solution Approach 1:
The patent applies parameter changes by controlling the phase angle of RF power signals to optimize plasma processing. By adjusting the phase angle parameter of the RF signal delivered to the showerhead, the system achieves uniform plasma distribution across large substrates without proportionally increasing equipment size or power consumption. This allows processing of large area substrates (greater than 1 m²) while maintaining manageable equipment dimensions.
2Productivity
If RF power is increased to process larger substrates, then processing capability is improved, but power consumption increases
Solution Approach 1:
The patent optimizes power consumption by controlling the phase angle parameter of RF signals. By adjusting the phase angle of harmonic signals relative to the fundamental frequency, the system achieves efficient plasma generation and uniform distribution across large substrates. This reduces the total RF power required compared to conventional approaches, thereby lowering power consumption while maintaining processing capability for large area substrates.
3Area of stationary object
If conventional scaling is applied to process large substrates, then processing area is increased, but process uniformity deteriorates
Solution Approach 1:
The patent applies local quality by controlling the phase angle of RF signals delivered to different regions of the showerhead. This allows optimization of plasma distribution across the entire large substrate area (greater than 1 m²), ensuring uniform processing conditions in each local region. The phase angle control compensates for edge effects and non-uniform plasma density, maintaining consistent material layer deposition across the whole substrate surface.
Solution Approach 2:
The patent employs dynamics by continuously adjusting the phase angle of RF signals during plasma processing. This dynamic control allows the system to adapt to changing plasma conditions and maintain uniform process parameters across large substrates. The real-time phase angle adjustment compensates for variations in plasma impedance and ensures consistent processing results throughout the large processing area.
4Stability of the object's composition
If process conditions are maintained consistently, then process stability is improved, but uniformity across large substrates deteriorates
Solution Approach 1:
The patent resolves this contradiction by dynamically adjusting the phase angle of RF signals while maintaining overall process stability. The system monitors plasma conditions and continuously optimizes the phase angle parameter to compensate for spatial variations across large substrates. This dynamic control enables both stable plasma maintenance and uniform process results across the entire substrate surface, overcoming the limitations of static process 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 approach enhances the uniformity and consistency of plasma processing results for large substrates by compensating for non-linear loads, reducing variations between chambers, and achieving predictable outcomes for material layer deposition.
Implementation Method 1
High frequency power, such as a radio frequency (RF) power, is often used to generate the plasma
Implementation Method 2
plasma processes are often used for deposition or etching of various material layers on substrates
Data Source
AI summary
A method of processing a material layer on a substrate is provided. The method includes delivering RF power from an RF power source through a match network to a showerhead of a capacitively coupled plasma chamber; igniting a plasma within the capacitively coupled plasma chamber; measuring one or more phase angles of one or more harmonic signals of the RF power relative to a phase of a fundamental frequency of the RF power; and adjusting at least one phase angle of at least one harmonic signal of the RF power relative to the phase of the fundamental frequency of the RF power based on the one or more phase angle measurements.