Photoresist Composition for Probe Arrays Using Ionic Photoacid Generators
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Solution Overview
Problem
Current photoresist compositions for fabricating probe arrays require high exposure energy to deprotect functional groups, which can cause damage to monomers and limit the efficiency of the photolithography process, especially when using i-line light sources.
Innovation Solution
A photoresist composition incorporating a photoacid generator with an onium salt and an i-line reactive sensitizer, which generates a strong acid with lower exposure energy, allowing for the deprotection of functional groups and improved pattern formation in probe arrays and semiconductor devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a non-ionic type photoacid generator is used with i-line light source, then monomer damage is minimized, but the acid generation capability is weak requiring high exposure energy
Solution Approach 1:
The patent changes the chemical structure of the photoacid generator from non-ionic to ionic type, which fundamentally alters the acid generation capability. This parameter change enables strong acid generation with i-line light while maintaining monomer protection, resolving the contradiction between weak acid generation and high exposure energy requirements
Solution Approach 2:
The patent creates a composite photoresist system combining ionic type photoacid generator, i-line reactive sensitizer, and specific resin components. This composite formulation synergistically enhances acid generation efficiency while maintaining selectivity for deprotecting functional groups without damaging monomers, solving the energy-efficiency problem
2Productivity
If high exposure energy is used to deprotect functional groups, then deprotection efficiency is improved, but monomer damage increases
Solution Approach 1:
The patent introduces an i-line reactive sensitizer as an intermediary substance that mediates between the i-line light and the photoacid generator. This sensitizer absorbs i-line light and transfers energy to generate strong acid efficiently, enabling effective deprotection at lower exposure energies that do not damage monomers
Solution Approach 2:
The patent changes the photoacid generator type to ionic, which fundamentally improves acid generation efficiency. This parameter change allows achieving high deprotection efficiency with reduced exposure energy, thereby preventing monomer damage while maintaining productivity
3Device complexity
If conventional photoresist composition is used, then process simplicity is maintained, but pattern profile quality is insufficient
Solution Approach 1:
The patent develops a composite photoresist composition with specifically formulated components including ionic photoacid generator, i-line reactive sensitizer, and optimized resin system. This composite formulation achieves superior pattern profile quality with improved sidewall verticality and reduced footing effects, while the process remains compatible with existing photolithography equipment and procedures
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 enables the deprotection of acid-labile protective groups with reduced exposure energy, minimizing monomer damage and improving the profile of formed patterns, thus enhancing the efficiency and cost-effectiveness of probe array fabrication and semiconductor device manufacturing.
Implementation Method 1
a photoacid generator having an onium salt, and an i-line reactive sensitizer
Implementation Method 2
deprotecting the functional group disposed on the selectively irradiated region
Data Source
AI summary
A photoresist composition for fabricating a probe array is provided. The photoresist composition includes a photoacid generator having an onium salt and an i-line reactive sensitizer.