PVD Target Lifetime Control via Energy Tracking
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Solution Overview
Problem
Physical vapor deposition (PVD) targets have finite service lifetimes, leading to reliability and safety concerns, including perforation and system arcing, which result in production losses and safety issues due to overuse, and existing methods for determining target lifetime are inaccurate and dependent on technician experience.
Innovation Solution
A method for controlling semiconductor deposition that involves identifying a PVD target's lifetime by tracking accumulated energy and using compensation curves to adjust operation parameters such as RF and DC power, nitrogen flow rate, and target-to-pedestal spacing to prolong target life and maintain film quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If PVD target is used beyond its service lifetime, then production output is maintained, but reliability deteriorates due to perforation and system arcing
Solution Approach 1:
The system performs preliminary action by tracking accumulated energy consumption and predicting target lifetime before actual failure occurs. The controller continuously monitors energy usage and compares it against predetermined thresholds to identify when the target is approaching its service lifetime limit, allowing proactive adjustment of operation parameters before perforation or arcing happens.
Solution Approach 2:
The system implements feedback by continuously monitoring accumulated energy consumption and using this information to dynamically adjust operation parameters. The controller receives feedback on energy usage, processes it through the identified compensation curve, and automatically adjusts parameters like RF power, DC power, and gas flow rates to maintain reliable operation throughout the target's service lifetime.
2Ease of operation
If operation parameters are kept constant throughout target lifetime, then ease of operation is maintained, but manufacturing precision deteriorates due to varying film quality
Solution Approach 1:
The system applies dynamics by transitioning from static constant parameters to dynamic adjustable parameters. The controller automatically adjusts operation parameters based on the target's current lifetime stage, using predetermined compensation curves that define optimal parameter values at different energy consumption levels. This dynamic adjustment maintains film quality consistency without requiring manual intervention.
Solution Approach 2:
The system implements parameter changes by modifying operation parameters (RF power, DC power, gas flow rates) according to the target's accumulated energy consumption. The controller uses predetermined compensation curves to determine appropriate parameter adjustments, automatically changing parameters from their initial values to optimized values as the target ages, thereby maintaining consistent film quality throughout the service lifetime.
3Device complexity
If target lifetime is determined by technician experience, then device complexity is minimized, but measurement precision deteriorates
Solution Approach 1:
The system replaces the mechanical/manual method of technician experience with an automated electronic monitoring and calculation system. The controller automatically tracks accumulated energy consumption using sensors and processors, eliminating the need for technician judgment. This substitution of manual assessment with electronic measurement and computation significantly improves lifetime determination accuracy while adding minimal complexity through standard control system components.
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 method extends the service life of PVD targets, ensures consistent film quality, and reduces production costs by optimizing operation parameters based on target lifetime, thereby preventing overuse and maintaining directional guidance for improved deposition profiles.
Implementation Method 1
Physical vapor deposition (PVD) is a well-known process for depositing a thin film of material on a substrate
Implementation Method 2
During sputtering, gas plasma is created in the chamber and directed to the PVD target. The plasma physically dislodges or erodes (sputters) atoms or molecules from the reaction surface of the PVD target
Implementation Method 3
During sputtering, gas plasma is created in the chamber and directed to the PVD target
Implementation Method 4
The plasma physically dislodges or erodes (sputters) atoms or molecules from the reaction surface of the PVD target into a vapor of the target material, as a result of collision with high-energy particles (ions) of the plasma
Data Source
AI summary
The present disclosure provides a method for controlling a semiconductor deposition operation. The method includes (i) identifying a first target lifetime in a physical vapor deposition (PVD) system; (ii) inputting the first target lifetime into a processor; (iii) outputting, by the processor, a plurality of first operation parameters according to a plurality of compensation curves; and (iv) performing the first operation parameters in the PVD system. The first operation parameters includes, but not limited to, an RF power tuning, a DC voltage tuning, a target to chamber pedestal spacing tuning, an AC bias tuning, an impedance tuning, a reactive gas flow tuning, an inert gas flow tuning, a chamber pedestal temperature tuning, or a combination thereof.