Resist Composition for Lithography Resolution and Roughness
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Solution Overview
Problem
As lithography techniques advance and pattern miniaturization progresses, existing resist materials face challenges in achieving improved resolution, exposure latitude, and reduced line width roughness, leading to shape defects in semiconductor elements and liquid crystal display elements.
Innovation Solution
A resist composition comprising a base component with acid-responsive solubility changes and an acid generator, featuring a polymeric compound with specific structural units that enhance lithography properties, allowing for the formation of resist patterns with improved shape and contrast in both alkali and solvent developing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional resist materials are used with shorter wavelength exposure light sources, then resolution is improved, but line width roughness and shape defects increase
Solution Approach 1:
The patent modifies the chemical structure of the base resin by introducing specific structural units (formula 1) with particular substituent patterns. This structural parameter change optimizes the resin's response to acid generation during exposure, improving both resolution and reducing line width roughness simultaneously. The specific substitution patterns on the aromatic rings create optimal steric and electronic properties for the chemically amplified resist system.
Solution Approach 2:
The patent creates a composite resist composition combining the novel base resin (formula 1) with specific acid generators and additives. This composite approach integrates multiple functional components that work synergistically: the base resin provides the structural framework, the acid generator enables chemically amplified solubility changes, and additives fine-tune the lithographic properties to achieve both high resolution and smooth line widths.
2Volume of moving object
If pattern miniaturization is pursued, then device density is improved, but shape defects in semiconductor elements increase
Solution Approach 1:
The patent optimizes the molecular parameters of the base resin including molecular weight, polydispersity, and specific structural substitution patterns. These parameter changes control the resin's glass transition temperature, chain flexibility, and acid diffusion characteristics, enabling precise pattern formation at miniaturized dimensions while maintaining shape fidelity and reducing defects in semiconductor elements.
Solution Approach 2:
The patent introduces local structural variations in the base resin through specific substituent patterns on aromatic rings (formula 1). These local structural modifications create regions with optimized properties for acid generation, acid diffusion, and solubility changes, enabling precise control over pattern formation at miniaturized scales while maintaining overall pattern integrity and reducing shape defects.
3Adaptability or versatility
If exposure latitude is increased, then process robustness is improved, but resolution may be compromised
Solution Approach 1:
The patent optimizes the chemical parameters of the base resin and acid generator system to achieve an optimal balance between exposure latitude and resolution. The specific structural units (formula 1) with controlled substitution patterns modify the acid-base chemistry to provide a more gradual and controllable solubility change, allowing broader exposure dose ranges to be tolerated while maintaining sharp pattern definition and high resolution.
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 effectively forms patterns with excellent lithography properties, including reduced roughness and improved resolution, addressing the challenges of miniaturization and shape defects in semiconductor and liquid crystal display elements.
Implementation Method 1
an acid generator component (B) which generates acid upon exposure
Implementation Method 2
a base component (A) which exhibits changed solubility in a developing solution under the action of acid
Data Source
AI summary
A resist composition including a base component (A) which exhibits changed solubility in a developing solution under the action of acid, and an acid generator component (B) which generates acid upon exposure, wherein the base component (A) contains a polymeric compound (A1) having a structural unit (a5) represented by general formula (a5-1). In formula (a5-1), R represents a hydrogen atom, an alkyl group or a halogenated alkyl group, X represents single bond or divalent linking group, W represents a cyclic alkylene group which may include an oxygen atom at arbitrary position, each of Ra and Rb independently represents a hydrogen atom or an alkyl group which may include an oxygen atom at arbitrary position, or alternatively, Ra and Rb may be bonded to each other to form a ring together with the nitrogen atom in the formula, and p represents integer of 1 to 3.