Resist Composition for ArF Lithography Sensitivity and CDU
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Solution Overview
Problem
Current resist compositions for lithography face challenges in achieving high sensitivity and critical dimension uniformity (CDU) as pattern miniaturization progresses, particularly with the need for new materials that can effectively work with advanced exposure light sources like ArF excimer lasers.
Innovation Solution
A resist composition that includes a polymer compound with a specific constitutional unit and an acid generator component, which generates an acid upon exposure, altering the solubility in developing solutions to form high-resolution resist patterns, suitable for both positive and negative type resist patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resist compositions are used with ArF excimer lasers, then basic lithography function is achieved, but sensitivity and critical dimension uniformity (CDU) are insufficient for further miniaturization
Solution Approach 1:
The patent changes the chemical parameters of the resist composition by introducing specific base resin components with controlled polarity and solubility characteristics, and optimizing the acid generator structure to enhance sensitivity and CDU for ArF excimer laser lithography
Solution Approach 2:
The patent creates a composite resist system combining multiple components: base resin (polymer compound), acid generator, and optional additives, where each component contributes specific properties to achieve high sensitivity and CDU simultaneously
2Manufacturing precision
If polarity of resin component is increased to improve solubility in alkali developing solution, then positive type pattern formation is enhanced, but solubility in organic developing solution decreases
Solution Approach 1:
The patent applies local quality by creating regions with different solubility characteristics through controlled polarity modification of the base resin, allowing selective dissolution in specific developing solutions based on exposure status
Solution Approach 2:
The patent introduces dynamic solubility control where the resin's solubility properties change based on exposure conditions and developing solution type, enabling the same resist composition to work for both positive and negative type patterns
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 resist composition enhances lithography characteristics by improving sensitivity and CDU, enabling the formation of precise resist patterns suitable for advanced lithography techniques.
Implementation Method 1
an acid generator component (B) which generates an acid upon exposure
Data Source
AI summary
A resist composition containing a polymer compound which has a constitutional unit (a0) represented by Formula (a0-1); and an acid generator which is formed of a compound represented by Formula (b1) (in the formulae, Ra00 represents an acid dissociable group represented by Formula (a0-r1-1); Ra01, Ra02, Ra031, Ra032, and Ra033 represent a hydrocarbon group; Ya0 represents a quaternary carbon atom; Rb1 represents a hydrocarbon group which has a steroid skeleton containing at least one hydroxyl group; Yb1 represents a divalent linking group having a single bond or a hetero atom; Vb1 represents a single bond, an alkylene group, or a fluorinated alkylene group; and Rf1 represents a hydrogen atom, a fluorine atom, or a fluorinated alkyl group).