EUV Collector Vibration Sensing for Real-Time Plasma and Debris Control
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Solution Overview
Problem
Traditional photolithography techniques using extreme ultraviolet (EUV) light for integrated circuit manufacturing face challenges due to inconsistent EUV light generation and debris contamination, leading to potential photolithography process failures and reduced wafer yields.
Innovation Solution
The implementation of vibration sensors coupled with a control system and machine learning processes to monitor and adjust EUV light generation parameters, such as droplet flattening and plasmatizing pulses, to optimize plasma formation and reduce debris accumulation on collector surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vibration sensors and machine learning processes are implemented to monitor and adjust EUV light generation parameters, then EUV light generation quality and wafer yields are improved, but device complexity increases
Solution Approach 1:
The patent implements feedback by using vibration sensors to continuously monitor plasma generation characteristics and feeding this information back to the control system. The control system adjusts laser pulse parameters (energy, timing, duration) based on real-time vibration data, creating a closed-loop control system that optimizes EUV light generation quality and reduces debris contamination.
Solution Approach 2:
The patent replaces traditional mechanical monitoring methods with vibration sensors that detect plasma characteristics through vibrational signals. This substitution allows for non-contact, real-time monitoring of plasma generation without physical interference, enabling precise control of EUV light production parameters.
2Object-generated harmful factors
If real-time monitoring and adjustment of plasma generation parameters is performed, then debris contamination is reduced, but loss of time for cleaning and maintenance increases
Solution Approach 1:
The patent applies preliminary action by monitoring plasma generation characteristics in real-time and making proactive adjustments before debris accumulates to problematic levels. The vibration sensors detect changes in plasma behavior that indicate potential debris generation, allowing the control system to adjust parameters preemptively to prevent contamination rather than clean it afterward.
Solution Approach 2:
The patent ensures continuity of useful action by maintaining continuous monitoring and adjustment of plasma generation parameters throughout the EUV light production process. This continuous control prevents debris accumulation without interrupting the photolithography workflow, eliminating the need for stopping production for cleaning operations.
3Measurement precision
If multiple vibration sensors are distributed across the EUV light generation chamber, then measurement precision of plasma characteristics is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies segmentation by distributing multiple vibration sensors across different locations within the EUV light generation chamber. Each sensor monitors local plasma characteristics, and the combined data provides a comprehensive picture of plasma generation quality. This segmented approach enables precise measurement of spatial variations in plasma behavior without requiring a single complex sensor system.
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 EUV light generation quality, reduces debris contamination, and enhances wafer yields by providing real-time adjustments and proactive cleaning, thereby stabilizing EUV power and energy output.
Implementation Method 1
A plurality of vibration sensors are distributed on an exterior surface of the collector and sense vibrations from the laser pulses, the droplets, and debris impacts.
Implementation Method 2
EUV light is typically produced by irradiating droplets of selected materials with a laser beam. The energy from the laser beam causes the droplets to enter a plasma state.
Implementation Method 3
The energy from the laser beam causes the droplets to enter a plasma state. In the plasma state, the droplets emit EUV light.
Implementation Method 4
The EUV light travels toward a collector with an elliptical or parabolic surface. The collector reflects the EUV light to a scanner.
Data Source
AI summary
An extreme ultraviolet (EUV) photolithography system generates EUV light by irradiating droplets with a laser. The system includes a collector and a plurality of vibration sensors coupled to the collector. The vibration sensors generate sensor signals indicative of shockwaves from laser pulses and impacts from debris. The system utilizes the sensor signals to improve the quality of EUV light generation.