Solid-State Matching Network Switching for Plasma Step Transitions
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Solution Overview
Problem
Traditional matching networks in semiconductor manufacturing processes cannot quickly adjust to changing impedance requirements during different process steps, leading to disruptions and inefficiencies due to the slow mechanical components of electro-mechanical capacitors.
Innovation Solution
Implementing a solid-state matching network with electronically variable reactance elements (EVCs) that can switch in and out of the network to rapidly adjust impedance configurations in sub-millisecond times, anticipating changes in process steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If electro-mechanical matching networks are used, then the structure is simple and reliable, but the switching speed is slow (hundreds of milliseconds to several seconds) causing process disruptions
Solution Approach 1:
The patent replaces electro-mechanical components (vacuum variable capacitors with moving parts) with solid-state electronically variable reactance elements. This substitution eliminates mechanical movement, enabling sub-millisecond switching speeds while maintaining the matching network's core function of impedance transformation between the RF source and plasma chamber.
Solution Approach 2:
The patent implements dynamically adjustable matching network parameters through electronically variable reactance elements that can be rapidly reconfigured during the semiconductor fabrication process. This allows the matching network to adapt to changing plasma impedance conditions in real-time, enabling fast transitions between different process steps without mechanical delays.
2Productivity
If match configuration changes are made mid-process, then power transfer efficiency improves, but process disruption occurs with slow mechanical components
Solution Approach 1:
The patent enables preliminary adjustment of matching network parameters before process steps change, allowing the system to be pre-configured for optimal power transfer. The solid-state components can anticipate and prepare for impedance changes, eliminating the need for slow mechanical repositioning during critical process transitions.
Solution Approach 2:
The patent utilizes electronically variable reactance elements that can rapidly change electrical parameters (capacitance/inductance values) in sub-millisecond timeframes. This allows continuous optimization of power transfer efficiency across different process steps without the time losses associated with mechanical component repositioning.
3Reliability
If additional process steps are added to prevent sudden power changes, then plasma stability is maintained, but overall process speed decreases
Solution Approach 1:
By replacing slow mechanical switching components with fast solid-state electronically variable reactance elements, the patent enables rapid response to power changes without requiring additional buffer process steps. The solid-state components can handle sudden power transitions while maintaining plasma stability, thereby eliminating productivity-reducing workaround steps.
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
Enables efficient power transfer without disrupting the plasma process by optimizing impedance matching for each step, reducing tune time and ensuring seamless transitions between process steps.
Implementation Method 1
the RF source generates power at the desired RF frequency and power, and this power is transmitted through the RF cables and networks to the plasma chamber
Implementation Method 2
The purpose of the matching network is to transform the plasma impedance to a value suitable for the RF source... The impedance on the input side of the matching network must be transformed to non-reactive 50 Ohm (i.e., 50+j0) for maximum power transmission
Implementation Method 3
Plasma processing involves energizing a gas mixture by imparting energy to the gas molecules by the introduction of RF (radio frequency) energy into the gas mixture
Data Source
AI summary
In one embodiment, a system for controlling a matching network of a semiconductor manufacturing system is disclosed. The matching network comprises an electronically variable reactance element (EVRE) that varies its total reactance using different match configurations. A plasma chamber carries out a process upon a substrate, the process comprising process steps including at least a first process step and a second process step. A memory, for each process step, stores instructions for carrying out the process step. A control circuit, while continuously carrying out each of the process steps of the process, upon anticipation that the plasma chamber will be transitioning from the first process step to the second process step, alters the match configuration to a new match configuration based on the instructions for carrying out the second process step.