Resin Composition Crosslinking Agent for Lithography Line Width Control
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Solution Overview
Problem
Current resist compositions face challenges in forming ultrafine patterns with line widths of 50 nm or less, as they suffer from significant line width variation due to PEB temperature dependency and poor storage stability, making it difficult to achieve high precision in semiconductor manufacturing.
Innovation Solution
An actinic ray-sensitive or radiation-sensitive resin composition is developed, comprising an alkali-soluble resin and a crosslinking agent represented by a specific general formula, which includes a phenolic nucleus with specific substituents that reduce particle formation and improve crosslinkability, thereby enhancing storage stability and temperature dependency resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional resist compositions are used for forming ultrafine patterns, then the basic lithographic process can be performed, but line width variation occurs due to PEB temperature dependency
Solution Approach 1:
The patent modifies the chemical composition parameters of the resist system by introducing specific crosslinking agents with phenolic nuclei and hydroxymethyl/alkoxymethyl groups. These compositional changes alter the thermal response characteristics of the resist, reducing its sensitivity to PEB temperature variations and thereby improving line width control precision.
Solution Approach 2:
The patent creates a composite resist system combining alkali-soluble resin, crosslinking agent, and acid generator. The crosslinking agent with specific phenolic structure forms a composite material that exhibits reduced thermal dependency, allowing the resist to maintain dimensional stability during post-exposure bake processes despite temperature fluctuations.
2Reliability
If conventional resist compositions are used, then the lithographic process can proceed, but storage stability deteriorates due to particle formation
Solution Approach 1:
The patent extracts and eliminates the problematic hydroxymethyl group from the crosslinking agent structure, replacing it with hydroxymethyl or alkoxymethyl groups. This structural modification removes the source of particle formation during storage while retaining the essential crosslinking functionality, thereby improving storage stability and reliability.
Solution Approach 2:
The patent employs a crosslinking agent design that prevents long-term particle formation issues. By using a stable phenolic nucleus structure with appropriate substituent groups, the resist composition maintains stability during storage without requiring frequent replacement or special handling, effectively addressing the short-living reliability issue.
3Strength
If crosslinking agents with hydroxymethyl groups are used, then crosslinking function is achieved, but storage stability deteriorates due to particle formation
Solution Approach 1:
The patent applies local quality modification by specifically targeting the substituent groups on the phenolic nucleus. The crosslinking agent retains the essential hydroxymethyl functionality for crosslinking at the reaction sites, while other positions are substituted with stable alkoxymethyl groups that prevent particle formation during storage, achieving both crosslinking strength and storage stability.
Solution Approach 2:
The patent changes the chemical parameters of the crosslinking agent by replacing pure hydroxymethyl groups with a combination of hydroxymethyl and alkoxymethyl groups. This parameter modification maintains the crosslinking reactivity while eliminating the particle formation issue, thereby improving storage stability without sacrificing crosslinking function.
4Manufacturing precision
If conventional resist compositions are used, then basic patterning can be achieved, but manufacturing precision deteriorates for patterns with line width of 50 nm or less
Solution Approach 1:
The patent modifies the chemical parameters of the resist system by introducing crosslinking agents with specific phenolic structures. These compositional changes enhance the resist's ability to maintain precise pattern dimensions during processing, enabling accurate fabrication of ultrafine patterns with line widths of 50 nm or less without requiring overly complex process control measures.
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 composition effectively reduces line width variation and improves storage stability, enabling the formation of high-resolution ultrafine patterns with improved sensitivity and dry etching resistance, suitable for next-generation semiconductor manufacturing techniques.
Implementation Method 1
a crosslinking agent, wherein the crosslinking agent is represented by the following General Formula (I)... (I) In General Formula (I)... *each of R1 to R6 independently represents a specific group
Implementation Method 2
actinic ray-sensitive or radiation-sensitive resin composition... high precision patterns can be formed using an electron beam or extreme ultraviolet rays
Data Source
AI summary
The composition contains an alkali-soluble resin and a crosslinking agent that is represented by the following General Formula (I). In the formula, each of R1 and R6 independently represents a hydrogen atom or a hydrocarbon group having 5 or less carbon atoms; each of R2 and R5 independently represents an alkyl group, a cycloalkyl group, an aryl group, or an acyl group; and each of R3 and R4 independently represents a hydrogen atom or an organic group having 2 or more carbon atoms, and R3 and R4 may be bonded to each other to form a ring.