Photoresist Composition for ArF Lithography Resolution
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Solution Overview
Problem
Current photoresist compositions for semiconductor microfabrication using lithography processes face challenges in achieving optimal resolution and dry-etching resistance, particularly when exposed to radiation, due to limitations in the monomer structures and acid-labile groups used.
Innovation Solution
A photoresist composition comprising specific monomers represented by formulas (I) and (II), a resin with acid-labile groups that are insoluble in alkali solutions but become soluble upon acid action, and an acid generator, which together form a pattern through a process of application, drying, radiation exposure, and alkaline development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional monomer structures and acid-labile groups are used in photoresist compositions, then the composition can be manufactured with existing materials, but the resolution and dry-etching resistance are insufficient for advanced lithography
Solution Approach 1:
The patent employs composite polymer structures combining multiple functional units: adamantyl-containing units for dry-etching resistance, hydroxyl-containing units for resolution enhancement, and acid-labile protecting groups for pattern formation. This composite approach integrates multiple functions within a single polymer architecture, achieving both improved resolution and etch resistance without requiring separate material layers.
Solution Approach 2:
The patent systematically varies key parameters including the type of acid-labile protecting group (t-butyl, adamantyl, norbornyl), the position of hydroxyl groups on the adamantyl ring, and the molecular weight of the polymer. These parameter optimizations enable fine-tuning of the photoresist properties to achieve optimal resolution and dry-etching resistance for specific lithography applications.
2Manufacturing precision
If photoresist composition is optimized for high resolution, then pattern definition improves, but dry-etching resistance deteriorates
Solution Approach 1:
The patent introduces local functional differentiation within the polymer structure by placing hydroxyl groups at specific positions on the adamantyl ring (positions 1, 2, or 3) and combining them with acid-labile protecting groups at different locations. This local quality variation allows the polymer to exhibit different properties in different regions: high resolution near the hydroxyl groups and high etch resistance from the adamantyl framework.
Solution Approach 2:
The patent merges previously separate functional components into a single integrated polymer structure. The adamantyl group provides both the structural framework for etch resistance and the scaffold for positioning hydroxyl groups that enhance resolution. The acid-labile protecting groups are attached to this integrated structure, enabling simultaneous achievement of pattern definition and etch resistance in one material.
3Adaptability or versatility
If photoresist composition uses advanced monomers for improved performance, then exposure latitude increases, but manufacturing complexity increases
Solution Approach 1:
The patent incorporates preliminary functional groups (hydroxyl groups and acid-labile protecting groups) into the polymer structure during synthesis, rather than adding them as separate steps later. The monomers are pre-designed with these functional groups attached to the adamantyl framework, allowing the final photoresist composition to achieve broad exposure latitude without requiring complex post-processing or multiple material layers.
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 composition provides improved resolution and dry-etching resistance, enabling the formation of high-quality photoresist patterns suitable for advanced lithography techniques such as ArF immersion lithography and EUV lithography, with enhanced exposure latitude.
Implementation Method 1
an acid generator
Implementation Method 2
a resin having an acid-labile group and being insoluble or poorly soluble in an aqueous alkali solution but becoming soluble in an aqueous alkali solution by the action of an acid
Data Source
AI summary
The present invention provides a photoresist composition comprising:at least one selected from the group consisting of a monomer represented by the formula (I):wherein R1 represents a hydrogen atom or a methyl group, W1 represents a C3-C20 divalent saturated cyclic hydrocarbon group, A1 represents a single bond or *-O—CO—W1— wherein * represents a binding position to W1═N— and W1 represents a C1-C10 divalent saturated hydrocarbon group, a polymer consisting of a structural unit derived from the monomer represented by the formula (I) and a polymer consisting of a structural unit derived from the monomer represented by the formula (I) and a structural unit derived from a monomer represented by the formula (II):wherein R3 represents a hydrogen atom or a methyl group, A2 represents a single bond or *-O—CO—(CH2)n— wherein * represents a binding position to R4—, n represents an integer of 1 to 7 and R4 represents a C3-C20 saturated cyclic hydrocarbon group,a resin having an acid-labile group and being insoluble or poorly soluble in an aqueous alkali solution but becoming soluble in an aqueous alkali solution by the action of an acid, andan acid generator.