UV-Protective Optical Coating for Microlithography
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Solution Overview
Problem
Existing optical components and radiation protective layers in microlithography are not stable under high-intensity UV radiation, leading to degradation of adhesives, fluid-repellent layers, and seals, which affects the longevity and performance of optical components in UV spectral ranges.
Innovation Solution
A radiation protective layer using materials like germanium dioxide, antimony pentoxide, and metal oxides is applied to optical components, providing high absorption of UV radiation, maintaining adhesion, and allowing transmission for UV curing, while being water-insoluble and stable, and can be applied using varnish-like formulations with nanoparticles for improved optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radiation protective layer is applied to protect against UV radiation, then the stability and longevity of the optical component is improved, but the transmission in the spectral range used for curing adhesive or fluid-repellent material may be reduced
Solution Approach 1:
The radiation protective layer is designed with spatially varying properties: it provides high UV absorption in regions where protection is needed while maintaining high transmission in the curing spectral range (300-400 nm) in regions where curing occurs. This local differentiation resolves the contradiction between protection and curing transmission.
Solution Approach 2:
The patent employs composite material structures combining radiation-protective materials (high UV absorption) with UV-transmissive materials. This composite approach enables simultaneous achievement of UV protection and curing transmission, resolving the contradiction between these opposing requirements.
2Reliability
If the radiation protective layer is made opaque to UV radiation, then the protection against UV degradation is improved, but the adhesion to the optical component and to adhesive or fluid-repellent layers may be worsened
Solution Approach 1:
The radiation protective layer exhibits local quality variations: it maintains UV-opacity for protection while incorporating adhesion-promoting characteristics in interface regions. This allows simultaneous achievement of UV protection and good adhesion to both the optical component and subsequent layers.
Solution Approach 2:
The radiation protective layer acts as an intermediary between the optical component and the adhesive or fluid-repellent layers. It provides UV protection while maintaining compatibility and adhesion with adjacent layers, resolving the contradiction between protection and bonding.
3Ease of manufacture
If conventional materials are used for the radiation protective layer, then the manufacturing process is simpler, but the aging stability under short-wave UV radiation is reduced
Solution Approach 1:
The patent uses composite material formulations combining conventional varnish-like materials with radiation-protective oxide nanoparticles. This composite approach maintains ease of application (dipping, spraying, brushing) while dramatically improving aging stability under short-wave UV radiation through the nanoparticle reinforcement.
Solution Approach 2:
The invention changes the physical-chemical parameters of conventional protective materials by incorporating nanoparticulate oxides (GeO2, Sb2O5, Al2O3, etc.). This parameter modification enhances UV absorption and aging stability while preserving the ease of application characteristics of varnish-like formulations.
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 solution significantly enhances the radiation resistance and adhesion of the protective layers, ensuring the stability and effectiveness of optical components under high UV exposure, allowing for prolonged use and maintaining the integrity of adhesives and fluid-repellent layers.
Implementation Method 1
the thin layer highly reflects or absorbs UV light from a used spectral range within the spectral range transmitted by the transparent component
Implementation Method 2
The adhesive is curable by UV light... the thin layer transmits light in a spectral range suitable for the curing of the adhesive
Data Source
AI summary
An optical component for transmitting radiation includes a radiation protective layer, which includes at least one oxide material selected from germanium dioxide (GeO2), antimony pentoxide (Sb2O5), aluminum oxide (Al2O3), niobium(V) oxide (Nb2O5), tin oxide (SnO2), metal oxides of rare earths, in particular lanthanum oxide (La2O3) or cerium oxide (CeO2), yttrium oxide (Y2O3), yttrium aluminum oxides, zinc oxide (ZnO), indium oxide (In2O3), bismuth trioxide (Bi2O3), barium titanate (BaTiO3) and spinels, such as magnesium aluminate (MgAl2O4). The radiation protective layer can be varnish-like, and the oxide material can be contained in a binder of the varnish-like radiation protective layer.