Acid-Switchable Resist Composition for Fine Pattern Lithography
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing resist compositions face challenges in achieving high sensitivity and satisfactory lithography characteristics, such as roughness, pattern shape, and defect reduction, particularly in the context of advanced semiconductor and liquid crystal display element manufacturing.
Innovation Solution
A resist composition that generates an acid upon light exposure, with a resin component whose solubility in a developing solution is changed by an acid action, incorporating a constitutional unit represented by General Formula (a0-1), which enhances the polarity and solubility properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional resist compositions are used, then basic lithography functionality is maintained, but sensitivity and lithography characteristics (roughness, pattern shape, defects) are insufficient for advanced pattern fining
Solution Approach 1:
The patent uses a composite resin system combining polyhydroxystyrene (providing acid sensitivity and solubility change) with fluorinated compounds (providing water repellency and surface properties). This composite approach enables simultaneous achievement of high sensitivity, good pattern shape, and reduced defects that single materials cannot provide alone.
Solution Approach 2:
The patent optimizes specific parameters including the fluorine content (0.1-10 mass%), molecular weight range of polyhydroxystyrene (10,000-1,000,000), and the ratio of resin to fluorinated compound. These parameter adjustments fine-tune the resist composition to achieve both high sensitivity and excellent lithography characteristics for advanced patterning.
2Object-affected harmful factors
If fluorinated resins are added to improve water repellency, then surface properties are enhanced, but sensitivity and lithography characteristics may deteriorate
Solution Approach 1:
The patent precisely controls the fluorine content within 0.1-10 mass% and optimizes the ratio of fluorinated compound to polyhydroxystyrene. This parameter optimization ensures sufficient water repellency for good pattern shape while preventing excessive fluorine content from reducing sensitivity and deteriorating lithography characteristics.
Solution Approach 2:
The fluorinated compounds are strategically used to provide localized water repellency at the resist surface and interface, while the bulk resist composition maintains high acid sensitivity through polyhydroxystyrene. This local quality differentiation achieves both water repellency and high sensitivity without mutual interference.
3Measurement precision
If pattern miniaturization is pursued by shortening exposure wavelength, then resolution is improved, but sensitivity requirements become more stringent
Solution Approach 1:
The patent uses polyhydroxystyrene with optimized molecular weight (10,000-1,000,000) and incorporates fluorinated compounds to enhance both resolution and sensitivity for short-wavelength exposure. The specific composition parameters are tuned to maintain high quantum efficiency and acid generation even at reduced wavelengths, enabling successful pattern miniaturization.
Solution Approach 2:
The composite resist system combines polyhydroxystyrene (providing acid sensitivity) with fluorinated compounds (enhancing surface properties and pattern fidelity). This composite material approach enables the resist to maintain high sensitivity while achieving the resolution required for advanced pattern fining at shortened wavelengths.
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 high sensitivity and improved lithography characteristics, including enhanced development contrast and reduced defects, thereby supporting the formation of fine patterns with satisfactory shape and reduced roughness.
Implementation Method 1
an acid generator component that generates an acid upon light exposure
Implementation Method 2
a base material component whose solubility in a developing solution is changed by an action of an acid
Data Source
AI summary
A resist composition which generates an acid upon light exposure and whose solubility in a developing solution is changed by an action of an acid, the resist composition including a resin component whose solubility in a developing solution is changed by an action of an acid, in which the resin component has a constitutional unit represented by General Formula (a0-1) in which R represents a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a halogen atom, or a halogenated alkyl group having 1 to 5 carbon atoms; Ya0 represents a single bond or a divalent linking group; Va0 represents a single bond or a linear or branched alkylene group; and Mm+ represents an m-valent cation