EUV Debris Detection via Light Scattering
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Solution Overview
Problem
The challenge in EUV photolithography is the contamination of reticles and scanner optics by debris particles, which affects the accuracy and efficiency of feature size reduction in integrated circuits, leading to potential functional failures of integrated circuits due to the minuscule size of features being produced.
Innovation Solution
Implementing a debris detection system using a detection light source and light sensor within the EUV photolithography system to real-time detect debris particles and adjust EUV generation parameters or initiate cleaning processes to prevent contamination, ensuring proper photolithography processes and increased wafer yields.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If EUV light is used to produce smaller features, then feature size is reduced, but debris particles contaminate the reticle and scanner optics more easily
Solution Approach 1:
The system performs preliminary detection of debris particles using a detection light source and sensor before they can contaminate the reticle or scanner optics. This early detection enables preventive action by adjusting EUV generation parameters or initiating cleaning processes, thus protecting the system while maintaining small feature size production
Solution Approach 2:
The debris detection system provides real-time feedback on particle presence in the EUV generation chamber. This feedback loop allows the control system to dynamically adjust EUV generation parameters or trigger cleaning processes based on actual debris conditions, resolving the contradiction between producing small features and preventing contamination
2Object-affected harmful factors
If real-time debris detection is implemented, then contamination is reduced, but device complexity increases
Solution Approach 1:
The system uses an intermediary detection light source and sensor arrangement to detect debris particles without requiring direct contact with the EUV generation process. This intermediary detection mechanism reduces complexity by separating the detection function from the EUV generation function, allowing real-time monitoring with minimal system integration 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
This approach effectively reduces debris accumulation, maintaining the precision of feature sizes, enhancing the performance and yield of integrated circuits by allowing real-time adjustments and preventive cleaning measures.
Implementation Method 1
detecting debris particles traveling from the extreme ultraviolet light generation chamber by emitting a detection light adjacent to an aperture of the extreme ultraviolet light generation chamber and sensing interaction of the debris particles with the detection light
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. In the plasma state, the droplets emit EUV light
Data Source
AI summary
An extreme ultraviolet (EUV) photolithography system detects debris travelling from an EUV generation chamber to a scanner. The photolithography system includes a detection light source and a sensor. The detection light source outputs a detection light across a path of travel of debris particles from the EUV generation chamber. The sensor senses debris particles by detecting interaction of the debris particles with the detection light.