Resist Underlayer Composition for Semiconductor Lithography
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Solution Overview
Problem
Current lithographic techniques for ultra-fine semiconductor pattern formation face challenges in achieving high resolution and uniformity due to reflection and interference issues, as well as stability against solvents and heat during photoresist pattern formation.
Innovation Solution
A resist underlayer composition comprising a polymer with specific moieties represented by Chemical Formulas 1 and 2, a solvent, and optional additives like cross-linking agents, surfactants, and thermal acid generators, which forms a uniform layer with excellent absorption properties and adherence to the photoresist, minimizing delamination and thickness loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a photoresist film is coated and exposed to form ultra-fine patterns, then pattern resolution is improved, but light reflection and interference cause non-uniformity and reduce manufacturing precision
Solution Approach 1:
An underlayer is introduced as an intermediary between the substrate and the photoresist film. This underlayer has optimized optical properties (refractive index and extinction coefficient) that suppress light reflection and interference during exposure, thereby improving pattern uniformity while maintaining high resolution
Solution Approach 2:
The underlayer is formed as a composite structure with specific chemical composition including aromatic rings, heteroatoms, and functional groups that provide both optical absorption properties and chemical resistance. This composite material approach allows simultaneous optimization of optical performance and stability
2Object-affected harmful factors
If conventional underlayer materials are used to suppress light interference, then optical absorption is improved, but stability against solvents and heat deteriorates
Solution Approach 1:
The underlayer material is designed as a composite polymer containing aromatic ring structures for optical absorption, heteroatoms (O, N, S) for chemical resistance, and specific functional groups. This multi-component molecular structure provides both optical properties and stability against solvents and heat
Solution Approach 2:
The molecular weight of the polymer is controlled within a specific range (1,000 to 100,000), and the composition includes specific ratios of aromatic rings, heteroatoms, and functional groups. These parameter optimizations simultaneously achieve light interference suppression and enhanced stability
3Object-affected harmful factors
If the underlayer composition is optimized for high refractive index and extinction coefficient, then light absorption is improved, but coating uniformity and adherence may deteriorate
Solution Approach 1:
The polymer molecular weight is controlled within a specific range (1,000 to 100,000) to balance optical absorption properties with coating processability. This parameter optimization ensures both high light absorption and uniform coating formation
Solution Approach 2:
The underlayer composition is designed with specific local molecular structures (aromatic rings, heteroatoms, functional groups) that provide both optical absorption and adhesion properties. The molecular structure is optimized to ensure good adherence to both the substrate and photoresist film while maintaining optical performance
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 achieves high refractive index and extinction coefficient values, suppressing light interference, ensuring uniform coating, and providing excellent etch selectivity and chemical resistance, thereby enhancing pattern resolution and stability during semiconductor processing.
Implementation Method 1
The composition achieves high refractive index and extinction coefficient values, suppressing light interference
Data Source
AI summary
A resist underlayer composition and a method of forming patterns using the resist underlayer composition, the resist underlayer composition including a polymer including a moiety represented by Chemical Formula 1 and a moiety represented by Chemical Formula 2, and a solvent,