Resist Composition for High-Resolution Lithography
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Solution Overview
Problem
Current lithography techniques face challenges in achieving improved lithography properties, particularly in forming resist patterns with high resolution and sensitivity for advanced semiconductor and liquid crystal display elements, as existing resist materials struggle with miniaturization and compatibility with shorter wavelength exposure sources.
Innovation Solution
A method involving a resist composition with a base component that exhibits reduced solubility in organic solvents under acid action and an acid-generator component, using a resin with structural units derived from specific compounds, such as those containing lactone, SO2, or carbonate cyclic groups, for negative-tone development with an organic solvent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional resist materials are used for miniaturization, then pattern resolution can be achieved, but sensitivity and adhesion deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the resist material by introducing a specific base component with carboxyl groups that exhibits reduced solubility in organic solvents under acid action. This parameter change enables the resist to maintain high adhesion during negative-tone development while achieving high pattern resolution, resolving the contradiction between resolution and adhesion
Solution Approach 2:
The patent creates a composite resist system by combining a base component (polymer with carboxyl groups), an acid generator, and specific additives. This composite formulation achieves both high sensitivity and high adhesion simultaneously, overcoming the limitations of conventional single-material resist systems
2Manufacturing precision
If shorter wavelength exposure sources are used, then pattern resolution improves, but sensitivity deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the resist to include a base component with specific functional groups that enhance acid generation efficiency. This enables the resist to maintain high sensitivity even when exposed to shorter wavelength light sources, allowing simultaneous achievement of high resolution and high sensitivity
3Manufacturing precision
If negative-tone development with organic solvent is used, then pattern formation is achieved, but adhesion deteriorates
Solution Approach 1:
The patent converts the harmful effect of organic solvent dissolution into a beneficial feature by designing a base component that is specifically engineered to resist dissolution in organic solvents under acid action. The carboxyl groups in the polymer form strong bonds with the substrate, and the acid-generated polarity change further reduces solubility, turning the potential harm of organic solvent exposure into enhanced adhesion
Solution Approach 2:
The patent changes the solubility parameters of the resist base component by introducing carboxyl groups and selecting polymers with specific chemical structures. This parameter change enables the resist to maintain high adhesion during negative-tone development with organic solvents while achieving clear pattern formation
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
This approach enhances lithography properties by improving pattern resolution, sensitivity, and adhesion, enabling the formation of high-aspect-ratio patterns suitable for advanced semiconductor and display element manufacturing.
Implementation Method 1
an acid-generator component (B) which generates an acid upon exposure
Data Source
AI summary
A method of forming a resist pattern using a resist composition containing a base component (A) which exhibits reduced solubility in an organic solvent under action of an acid and an acid-generator component (B) which generates an acid upon exposure, the base component (A) including a resin component (A1) having a structural unit (a0) derived from a compound represented by general formula (a0-1) shown below and a structural unit (a2) containing a lactone-containing cyclic group or the like (in formula (a0-1), Ra1 represents a monovalent substituent having a polymerizable group, La1 represents O, S or a methylene group, R1 represents a linear or branched hydrocarbon group of 2 to 20 carbon atoms which may have a substituent, or a cyclic hydrocarbon group which may have a hetero atom, and n represents an integer of 0 to 5).