Chemically Amplified Resist Composition for ArF Lithography
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Solution Overview
Problem
Current resist compositions for advanced lithography techniques, such as those using ArF excimer lasers, require improved roughness and lithography properties to maintain pattern miniaturization and resolution.
Innovation Solution
A resist composition comprising a polymeric compound with a specific structural unit and an acid generator component, which generates acid upon exposure, allowing for changed solubility in developing solutions, thereby improving resist pattern formation and lithography properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional resist compositions are used for advanced lithography, then pattern miniaturization is achieved, but line edge roughness increases and lithography properties deteriorate
Solution Approach 1:
The patent uses a composite resin system combining carboxylic acid groups with hydroxyl groups in specific ratios. This composite material approach allows simultaneous optimization of pattern resolution through acid-base interactions and line edge roughness control through balanced hydrophilicity-hydrophobicity properties.
Solution Approach 2:
The patent systematically adjusts the ratio of carboxylic acid groups to hydroxyl groups in the resin, and modifies the molecular weight and structure of the polymeric compound. These parameter changes enable fine-tuning of the resist's response to exposure and development, improving both resolution and reducing line edge roughness.
2Manufacturing precision
If shorter wavelength exposure light is used, then pattern resolution improves, but sensitivity to exposure light decreases
Solution Approach 1:
The patent modifies the chemical structure of the resin to include specific functional groups that enhance quantum efficiency for shorter wavelengths. By adjusting the molecular weight, functional group ratios, and chemical composition, the resist maintains high sensitivity while achieving improved resolution at shorter exposure wavelengths.
Solution Approach 2:
The patent replaces traditional resist mechanisms with chemically amplified resist chemistry, where a small amount of acid generated during exposure triggers a amplified chemical reaction that changes solubility. This substitution enables higher sensitivity at shorter wavelengths by decoupling the direct absorption requirement from the solubility change mechanism.
3Quantity of substance
If chemically amplified resist composition is used, then sensitivity increases, but control over developing process becomes difficult
Solution Approach 1:
The patent carefully controls the concentration and type of base components (carboxylic acid and hydroxyl groups) to modulate the chemical amplification effect. By adjusting these parameters, the resist achieves high sensitivity while maintaining predictable and controllable development behavior through balanced acid-base interactions.
Solution Approach 2:
The patent creates local chemical environment differences through the spatial distribution of acid and base groups in the resin structure. This local quality variation allows the resist to exhibit different properties in exposed versus unexposed regions, enabling both high sensitivity and precise developing control through localized chemical reactions.
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 achieves enhanced lithography properties, including improved sensitivity and reduced line edge roughness, enabling the formation of precise resist patterns with improved shape and resolution.
Implementation Method 1
an acid generator component (B) which generates acid upon exposure
Data Source
AI summary
A resist composition including a base component which exhibits changed solubility in a developing solution under action of acid and an acid generator which generates acid upon exposure, the base component containing a polymeric compound containing a structural unit represented by general formula (a0-1) and the acid generator containing a compound represented by general formula (b1). In the formulae, R represents H, an alkyl group of C1 to 5 or a halogenated alkyl group of C1 to 5; Ya1 represents a single bond or a divalent linking group; La1 and La2 represents —SO2— or —C(═O)—; Ra1 represents a cyclic group which may have a substituent and the like; n1 and n2 represents 0 or 1; R11 represents a cyclic group of C5 to 30 which may have a substituent; V11 represents a single bond or an alkylene group of C1 to 6; L11 represents an ester bond; Y11 represents an alkylene group of C1 to 5 which may have a fluorine atom; m represents an integer of 1 or more; and Mm+ represents an organic cation having a valency of m.