Laser Line Narrowing Module for Semiconductor Exposure Resolution
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Solution Overview
Problem
In semiconductor exposure apparatuses, the natural oscillation amplitudes of KrF and ArF excimer lasers cause chromatic distortion, reducing resolution due to wide spectrum line widths, which existing technologies fail to adequately address by narrowing the spectrum line width effectively.
Innovation Solution
A light source apparatus and data processing method that utilize a line narrowing module with an etalon or grating to control pulse laser output, synchronizing luminescence trigger signals with pulse laser beams, and a data collection processor to map exposure data accurately, associating pulse laser characteristics with wafer and scanning exposure information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a gas laser apparatus (KrF or ArF excimer laser) is used for exposure, then higher resolution is achieved through wavelength shortening, but chromatic distortion occurs due to wide natural oscillation amplitudes (350-400 pm) causing spectrum line width expansion
Solution Approach 1:
An etalon is introduced as an intermediary optical element within the laser resonator to filter and narrow the spectrum line width. The etalon acts as a selective mediator that allows only specific wavelengths to pass through, thereby reducing chromatic distortion while maintaining the ultraviolet laser output for high-resolution exposure
Solution Approach 2:
The spectrum line width parameter is actively changed from a wide range (350-400 pm) to a narrowed range by implementing the etalon in the resonator. This parameter change directly reduces chromatic distortion and improves the quality of the laser beam for exposure applications
2Object-affected harmful factors
If an etalon is mounted in the laser resonator to narrow spectrum line width, then chromatic distortion is reduced, but device complexity increases due to additional optical components
Solution Approach 1:
The etalon serves multiple functions simultaneously: it narrows the spectrum line width, reduces chromatic distortion, and maintains laser oscillation within the resonator. This multi-functionality justifies the added component by providing several benefits from a single element
Solution Approach 2:
The etalon modifies key laser parameters (spectrum line width and wavelength selectivity) to achieve the desired optical performance, transforming the laser output characteristics without requiring complete redesign of the resonator system
3Manufacturing precision
If pulsed light is used for sequential scanning exposure of divided areas, then total exposure area coverage is improved, but data management complexity increases due to need to associate pulse characteristics with wafer and scanning information
Solution Approach 1:
The system implements feedback by detecting pulse light characteristics and using this information to control and map exposure data. The detected characteristics feed back into the data processing system to accurately associate each pulse with its corresponding wafer area and scanning parameters, ensuring precise exposure control
Solution Approach 2:
Data mapping and association are performed in advance during the exposure process, linking pulse characteristics with wafer and scanning information before final processing. This preliminary organization of data simplifies subsequent analysis and quality control
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 solution effectively narrows the spectrum line width of laser beams, reducing chromatic distortion and improving resolution by accurately associating exposure data with wafer areas, enhancing the precision of semiconductor fabrication processes.
Implementation Method 1
a line narrowing module (LNM) with a line narrowing element (an etalon, a grating, or the like) may be mounted
Implementation Method 2
a line narrowing module (LNM) with a line narrowing element (an etalon, a grating, or the like) may be mounted
Implementation Method 3
a detector configured to detect a characteristic of the pulsed light
Data Source
AI summary
A light source apparatus according to an embodiment may be used for an exposure apparatus which exposes a plurality of wafers by repeating a wafer exposure for exposing a total exposure area of each wafer. The wafer exposure may include a sequential execution of scanning exposures in which each divided area defined by dividing the total exposure area of each wafer is scanned by pulsed light. The apparatus may comprise: a light source controller configured to execute a control for outputting the pulsed light based on a luminescence trigger signal received from the exposure apparatus; a detector configured to detect a characteristic of the pulsed light; and a data collection processor configured to collect at least a piece of data in data included in a pulse light data group related to the pulsed light detected by the detector and a control data group related to the control, and execute a mapping process of mapping the collected data by at least one of scanning exposure basis and wafer exposure basis.