Lithography Process Model Adjustment for Sub-Resolution Patterning
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Solution Overview
Problem
Current lithographic projection technologies face challenges in accurately reproducing patterns with dimensions smaller than the classical resolution limit, leading to difficulties in achieving desired electrical functionality and performance, especially with the increasing complexity of semiconductor manufacturing.
Innovation Solution
A method involving the measurement and simulation of image characteristics under various processing conditions, with a process model adjustment based on deviations to improve the accuracy of pattern reproduction and defect inspection on substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If lithographic projection apparatus projects pattern with dimensions smaller than classical resolution limit, then manufacturing precision of functional elements is improved, but reliability of pattern reproduction deteriorates
Solution Approach 1:
The patent applies parameter changes by systematically varying processing conditions (illumination wavelength, numerical aperture, resist composition, temperature, chemical treatment parameters) to optimize the lithographic process for sub-resolution patterning. This allows achieving smaller feature dimensions while maintaining pattern fidelity through coordinated adjustment of multiple process parameters
Solution Approach 2:
The patent implements feedback mechanisms by measuring actual pattern characteristics after lithography and using this information to iteratively refine and optimize the lithographic process parameters. This closed-loop approach ensures reliable pattern reproduction by continuously correcting deviations from target dimensions
2Manufacturing precision
If sophisticated fine-tuning steps are applied to lithographic projection apparatus, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent employs universal process models and simulation frameworks that can handle multiple patterning scenarios and process conditions through a single integrated system. This multi-functional approach reduces overall complexity by consolidating what would otherwise require separate specialized processes for different patterning challenges
3Manufacturing precision
If features with dimensions smaller than wavelength/2 are printed, then manufacturing precision is improved, but difficulty of detecting and measuring increases
Solution Approach 1:
The patent introduces intermediary measurement techniques and proxy indicators that make sub-wavelength features detectable. By using intermediate structures, diffraction patterns, or indirect measurement methods, the system can characterize features smaller than the direct resolution limit, effectively bridging the gap between manufacturing capability and measurement capability
Data Source
AI summary
A method where deviations of a characteristic of an image simulated by two different process models or deviations of the characteristic simulated by a process model and measured by a metrology tool, are used for various purposes such as to reduce the calibration time, improve the accuracy of the model, and improve the overall manufacturing process.