Transition Metal Cluster Photoresist for EUV Fine-Pattern Resolution
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Solution Overview
Problem
Conventional photoresists used in semiconductor photolithography struggle to achieve high resolution and sensitivity for ultra-fine patterns due to acid diffusion, limiting further miniaturization in semiconductor devices.
Innovation Solution
A transition metal cluster compound with a vinyl group terminal that easily polymerizes upon exposure to extreme ultraviolet (EUV) rays and a carboxylic acid with an alkyl or aryl chain that dissolves in organic solvents is used, creating a differential dissolution rate between exposed and unexposed areas for high contrast development.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional photoresists containing photoacid generators are used, then chemical amplification enhances sensitivity, but acid diffusion causes resolution degradation
Solution Approach 1:
The invention extracts and eliminates the photoacid generator component from the photoresist composition, replacing it with a metal cluster compound that directly undergoes photolysis. This removal of the acid-generating mechanism prevents acid diffusion while maintaining sensitivity through alternative photochemical pathways involving metal cluster fragmentation and vinyl group polymerization.
Solution Approach 2:
The invention changes the fundamental photochemical reaction mechanism from acid-catalyzed deprotection to direct metal cluster photolysis and radical polymerization. This parameter change in the chemical reaction pathway eliminates the diffusion-limited acid transport step while preserving light absorption and chemical transformation efficiency.
2Productivity
If circuit patterns are miniaturized to achieve higher device capacity, then more transistors can be integrated, but resolution requirements become more stringent
Solution Approach 1:
The invention changes the photochemical mechanism to eliminate acid diffusion, enabling resolution sufficient for ultra-fine pattern formation. This allows continued miniaturization of circuit patterns while maintaining manufacturing precision through a photoresist system that does not rely on diffusive acid transport.
Solution Approach 2:
The invention employs a composite photoresist system combining metal cluster compounds with vinyl groups and carboxylic acid groups. This composite material structure enables both high sensitivity through metal cluster photolysis and high resolution through controlled dissolution behavior, supporting further pattern miniaturization.
3Manufacturing precision
If non-chemically amplified photoresists based on metal compounds are used, then acid diffusion is eliminated, but exposure sensitivity and development contrast need improvement
Solution Approach 1:
The invention creates a composite photoresist system where metal cluster compounds provide high sensitivity through efficient light absorption and photolysis, while vinyl groups enable polymerization for structural integrity and carboxylic acid groups provide dissolution contrast. This composite approach simultaneously achieves high resolution and high exposure sensitivity.
Solution Approach 2:
The invention optimizes the metal cluster composition and ligand structure to enhance light absorption efficiency and photolysis quantum yield. By adjusting the metal type, cluster size, and organic ligand characteristics, the photoresist achieves high exposure sensitivity without relying on chemical amplification, while maintaining the resolution benefits of non-chemically amplified systems.
4Manufacturing precision
If photoresists are designed for high resolution, then pattern definition improves, but development contrast may be compromised
Solution Approach 1:
The invention introduces local quality differences through the dual-functional carboxylic acid groups that exhibit different dissolution behaviors in exposed and unexposed regions. The metal cluster photolysis creates localized chemical changes that enhance dissolution contrast, allowing high resolution pattern definition while maintaining easy development through significant solubility differences between exposed and unexposed areas.
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 compound achieves high exposure sensitivity and resolution, enabling the formation of ultra-fine patterns with high development contrast and sensitivity, particularly in extreme ultraviolet lithography.
Implementation Method 1
a vinyl group terminal that is easily polymerized... upon exposure to extreme ultraviolet (EUV) rays
Implementation Method 2
a carboxylic acid with an alkyl or aryl chain that dissolves in organic solvents... creating a differential dissolution rate between exposed and unexposed areas
Data Source
AI summary
A transition metal cluster compound is capable of realizing fine circuit patterns, a photosensitive composition contains the transition metal cluster compound, and a pattern forming method uses the photosensitive composition. The transition metal cluster compound contains transition metal elements and a ligand represented by the following general formula (1):wherein R1 is a hydrocarbon chain having one or more carbon atom.