Projection Optics Aberration Prediction in Wafer Exposure
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Solution Overview
Problem
Existing exposure apparatuses in semiconductor and liquid crystal display manufacturing suffer from aberration issues due to heat absorption by the projection optical system, leading to reduced resolution performance and quality failures during exposure processing.
Innovation Solution
An exposure method that predicts changes in optical characteristics using aberration saturation models and performs dummy irradiation to adjust aberration before it exceeds a predetermined range, ensuring consistent exposure quality across multiple substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If exposure processing is performed continuously on multiple substrates, then productivity is improved, but optical characteristic degradation occurs due to heat accumulation
Solution Approach 1:
The system performs preliminary prediction of optical characteristic changes before they occur during exposure processing. By calculating the projected aberration saturation based on exposure conditions and historical data, the system can proactively adjust optical characteristics before degradation occurs, enabling continuous exposure while maintaining quality
Solution Approach 2:
The system implements a feedback mechanism where actual optical characteristic measurements are continuously monitored during exposure processing. This measured data is fed back into the prediction model to refine future predictions and trigger real-time adjustments when aberration saturation approaches critical thresholds, allowing sustained high-volume production with stable optical performance
2Manufacturing precision
If aberration correction is performed frequently, then manufacturing precision is improved, but exposure processing time increases
Solution Approach 1:
The prediction mechanism identifies when optical characteristic degradation is approaching critical levels, allowing adjustments to be made at optimal moments rather than reacting to actual quality failures. This predictive approach minimizes the frequency of corrections while maintaining precision
Solution Approach 2:
The system dynamically adjusts exposure parameters such as illumination intensity and exposure duration based on predicted optical characteristic changes. By modifying these parameters, the system can compensate for aberration effects without requiring frequent hardware adjustments, thus maintaining precision while minimizing processing time loss
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
The method effectively reduces the impact of aberration on exposure processing, maintaining resolution performance and ensuring high-quality manufacturing by proactively adjusting optical characteristics during the exposure process.
Implementation Method 1
If the projection optical system absorbs exposure light and generates heat, aberration occurs
Implementation Method 2
an exposure apparatus that illuminates a master by an illumination optical system and projects a pattern of the master onto a substrate via a projection optical system to expose the substrate
Data Source
AI summary
An exposure method includes performing exposure processing via a projection optical system between a start and an end of the exposure processing on a plurality of substrates included in a lot as exposure, predicting a change in an optical characteristic of the projection optical system during the exposure based on an exposure processing condition of the exposure, determining whether the optical characteristic exceeds a predetermined range during the exposure based on a predicted result, and in a case where the optical characteristic is determined to exceed the predetermined range during the exposure, adjusting the optical characteristic before the optical characteristic exceeds the predetermined range, wherein at least one or more of the plurality of substrates is/are exposed after the adjusting.