Single Magnetron Sputtering Anode Coating Mitigation
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Solution Overview
Problem
Current single magnetron sputtering systems face inefficiencies in power usage and material consumption due to anode coating with insulating dielectric film, which affects the sputtering process.
Innovation Solution
A system with a pulsed DC power supply and an anode monitor system that adjusts sputtering energy based on anode health, using a datastore for uncoated anode characterization data to detect and mitigate dielectric material buildup by altering anode sputtering energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If continuous sputtering operation is performed, then thin film deposition continues, but dielectric material builds up on the anode reducing process efficiency
Solution Approach 1:
The patent implements periodic reversal of voltage polarity between target and anode. During target sputtering mode, positive voltage is applied to the target for film deposition. During anode sputtering mode, positive voltage is applied to the anode to eject dielectric material. This periodic action allows continuous operation while preventing anode degradation.
Solution Approach 2:
The system periodically switches to anode sputtering mode to remove (discard) accumulated dielectric material from the anode surface. This recovery process restores anode performance and electrical characteristics, allowing the system to maintain efficiency over extended operation periods.
2Reliability
If anode sputtering energy is increased to eject dielectric material, then anode health is improved, but power consumption increases
Solution Approach 1:
The system employs a voltage monitor to detect anode voltage and compare it against expected values stored in a datastore. When the detected voltage deviates from expected values indicating dielectric buildup, the system generates a health value and automatically adjusts anode sputtering energy accordingly. This feedback mechanism ensures anode health is maintained while minimizing unnecessary power consumption.
Solution Approach 2:
The anode sputtering energy is dynamically adjusted based on real-time anode health assessment. The pulse controller modifies the second anode sputtering energy relative to the first anode sputtering energy based on the health value, creating a dynamic control system that adapts to changing anode conditions rather than using fixed high energy levels.
3Reliability
If voltage polarity is reversed frequently to maintain anode cleanliness, then dielectric buildup is prevented, but process complexity increases
Solution Approach 1:
The system uses the anode's own electrical characteristics (voltage) as the sensing mechanism for detecting dielectric buildup. The voltage monitor continuously measures anode voltage, and when deviation occurs, the system automatically initiates anode sputtering mode to clean the anode. This self-service approach eliminates the need for external sensors or complex control systems.
Solution Approach 2:
The pulsed DC power supply performs multiple functions: it provides target sputtering power, anode sputtering power, and simultaneously serves as the monitoring system through voltage detection. The pulse controller integrates both deposition and cleaning operations, reducing the need for separate dedicated systems and simplifying overall device complexity.
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
Improves power usage efficiency and extends anode life by effectively ejecting dielectric material, maintaining process efficiency and reducing material consumption.
Implementation Method 1
Sputtering historically includes generating a magnetic field in a vacuum chamber and causing a plasma beam in the chamber to strike a sacrificial target, thereby causing the target to sputter (eject) material
Implementation Method 2
generating a magnetic field in a vacuum chamber and causing a plasma beam in the chamber to strike a sacrificial target
Implementation Method 3
magnetrons that utilize strong electric and magnetic fields to confine charged plasma particles close to the surface of the target
Implementation Method 4
magnetrons that utilize strong electric and magnetic fields to confine charged plasma particles
Implementation Method 5
supply a first anode sputtering energy immediately following the first target sputtering energy with a second voltage polarity... to eject at least a portion of the dielectric material from the anode
Data Source
AI summary
A system and method for single magnetron sputtering are described. One example includes a system having a power supply, a plasma chamber enclosing a substrate, an anode, and a target for depositing a thin film material on the substrate. This example also has a datastore with uncoated anode characterization data and an anode sputtering adjustment system including an anode analysis component to generate a first health value. The first health value is indicative of whether the anode is coated with a dielectric material. This example also has an anode power controller to receive the first health value and provide an anode-energy-control signal to the pulse controller of the pulsed DC power supply to adjust a second anode sputtering energy relative to a first anode sputtering energy to eject at least a portion of the dielectric material from the anode.