Acid-Dissociable Polymeric Resist for Fine Lithography
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Solution Overview
Problem
Conventional resist compositions used in semiconductor and liquid display device manufacturing fail to achieve optimal lithography properties and resist pattern shape, particularly in the formation of extremely fine patterns, due to limitations in sensitivity and resolution.
Innovation Solution
A resist composition is developed that includes a polymeric compound with a specific structural unit, which generates acid upon exposure, leading to increased solubility contrast between exposed and unexposed portions, allowing for improved resist pattern formation through the introduction of an acid dissociable, branched hydrocarbon group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional resist compositions are used, then manufacturing process is simple, but lithography properties and resist pattern shape are insufficient
Solution Approach 1:
The patent modifies the chemical structure of the base component by introducing a specific structural unit with an acid-dissociable group (formula 1) into the polymeric compound. This structural parameter change enables the resist to achieve excellent lithography properties and resist pattern shape by controlling solubility changes upon acid generation during exposure
Solution Approach 2:
The resist composition employs a composite structure consisting of a base component (polymeric compound with structural unit formula 1) and an acid generator component. This composite material approach combines the solubility-modifying capability of the polymeric compound with the acid-generation function of the acid generator, achieving superior lithography performance
2Manufacturing precision
If exposure wavelength is shortened to improve resolution, then pattern miniaturization is achieved, but sensitivity and lithography properties deteriorate
Solution Approach 1:
The patent optimizes the chemical structure of the base component by incorporating structural units with specific acid-dissociable groups (formula 1) that exhibit enhanced solubility contrast upon acid generation. This chemical parameter optimization maintains high sensitivity and excellent lithography properties even when using shorter wavelength exposure light sources for pattern miniaturization
3Ease of manufacture
If base component structure is simplified, then ease of manufacture increases, but solubility contrast and pattern shape deteriorate
Solution Approach 1:
The patent introduces a specifically designed structural unit (formula 1) with an acid-dissociable group into the polymeric compound. This targeted structural modification provides excellent solubility contrast between exposed and unexposed regions, enabling precise resist pattern formation while maintaining reasonable manufacturing complexity
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 and improved resist pattern shape with increased sensitivity and resolution, enabling the formation of precise patterns suitable for advanced semiconductor and display device manufacturing.
Implementation Method 1
a resist composition which generates acid upon exposure and exhibits changed solubility in a developing solution under action of acid
Data Source
AI summary
A polymeric compound having a structural unit represented by general formula (a0-1), and a resist composition containing the same (in which R represents a hydrogen atom, an alkyl group of 1 to 5 carbon atoms or a halogenated alkyl group of 1 to 5 carbon atoms; Va01 and Va02 each independently represents a hydrocarbon group of 2 to 10 carbon atoms; Va01-La0— represents Va01-C(═O)O— or Va01-OC(═O)—; Ra0 represents an acid dissociable, branched hydrocarbon group of 8 or more carbon atoms, an acid dissociable, monocyclic hydrocarbon group of 4 or more carbon atoms, or an acid dissociable, polycyclic hydrocarbon group, provided that methyl adamantyl group is excluded.