Adamantane-Hydroxyl Copolymer Resist for EUV Lithography Resolution
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Solution Overview
Problem
Current resist compositions for semiconductor microfabrication lack high sensitivity and resolution, particularly in achieving optimal pattern profiles and line edge roughness during lithography processes.
Innovation Solution
A polymer comprising specific structural units, such as those derived from 2-ethyl-2-adamantyl methacrylate and p-hydroxystyrene, combined with an acid generator, is used to create a resist composition suitable for extreme ultraviolet lithography or electron beam lithography, enhancing pattern resolution and profile quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resist compositions are used, then manufacturing process is simple, but sensitivity and resolution are insufficient
Solution Approach 1:
The patent employs composite polymer structures combining multiple functional units: adamantane-based structural units (for sensitivity and resolution enhancement), hydroxyl-containing structural units (for pattern profile control), and main chain structural units (for backbone stability). This composite approach achieves high sensitivity and resolution while maintaining processability through synergistic functional integration.
Solution Approach 2:
The polymer design implements local quality by distributing different functional units at specific proportions within the polymer chain. The adamantane structural units are incorporated at controlled ratios to provide localized sensitivity enhancement, while hydroxyl units are positioned to specifically affect pattern profile formation in critical regions.
2Measurement precision
If polymer with specific structural units is used, then sensitivity and resolution improve, but line edge roughness increases
Solution Approach 1:
The patent optimizes the compositional parameters of the polymer by precisely controlling the ratio of adamantane structural units to hydroxyl-containing structural units. By adjusting these parameters, the invention achieves a balance where sufficient sensitivity and resolution are obtained while line edge roughness is kept within acceptable limits through the moderating effect of hydroxyl groups.
Solution Approach 2:
The polymer structure incorporates hydroxyl-containing structural units at specific locations and ratios to locally modify the polymer properties. These hydroxyl units act as modifiers that suppress excessive line edge roughness while preserving the resolution-enhancing effects of adamantane units in other regions of the polymer chain.
3Shape
If polymer containing multiple structural units is synthesized, then pattern profile improves, but synthesis difficulty increases
Solution Approach 1:
The patent employs segmentation by designing the polymer as a copolymer with distinct functional segments: adamantane-based segments for sensitivity, hydroxyl-containing segments for profile control, and main chain segments for structural integrity. This segmented architecture allows each segment to be optimized independently while maintaining overall synthesis feasibility through standard copolymerization techniques.
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 polymer-based resist composition demonstrates improved sensitivity, resolution, and pattern profile, specifically suitable for EUV and electron beam lithography, with enhanced line edge roughness and stability.
Implementation Method 1
a resist composition used for semiconductor microfabrication employing a lithography process contains an acid generator comprising a compound generating an acid by irradiation
Data Source
AI summary
A polymer comprising a structural unit represented by the formula (I):wherein R1 represents a hydrogen atom or a methyl group, X represents a linear or branched chain C1-C6 alkylene group, Z represents a group represented by the formula (Ia):wherein R2 is independently in each occurrence a linear or branched chain C1-C6 alkyl group and m represents an integer of 0 to 15, and a structural unit represented by the formula (II):wherein R3 represents a hydrogen atom or a methyl group, R4 is independently in each occurrence a linear or branched chain C1-C6 alkyl group and n represents an integer of 0 to 4.