Resist Underlayer Composition for Pattern Stability
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Solution Overview
Problem
In the semiconductor industry, as patterns become finer, resist underlayers face challenges in maintaining uniform thickness, close contacting properties with photoresists, and sensitivity to exposure light sources, leading to potential pattern collapse during etching processes.
Innovation Solution
A resist underlayer composition incorporating specific polymers and compounds, such as those represented by Chemical Formulas 1, 2, and 3, with defined structural units and linkages, along with a solvent, is used to enhance film density and sensitivity, preventing pattern collapse and improving patterning performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resist underlayer is made thin to accommodate finer semiconductor patterns, then the coating uniformity and pattern stability deteriorate, but making it thicker improves uniformity and stability
Solution Approach 1:
The patent modifies the chemical composition parameters of the resist underlayer by incorporating specific polymers (novolac resin with phenolic hydroxyl groups, acrylic resin with carboxyl groups) and crosslinking agents. These compositional changes enable the thin film to achieve sufficient mechanical stability and adhesion without increasing thickness, resolving the contradiction between thinness and pattern stability.
Solution Approach 2:
The patent creates a composite material system by combining multiple polymer components (novolac resin, acrylic resin) with crosslinking agents and solvents. This composite approach allows the thin resist underlayer to achieve enhanced mechanical properties, adhesion, and chemical resistance that would be impossible with a single material, thus maintaining pattern stability at reduced thickness.
2Manufacturing precision
If the resist underlayer thickness is reduced for fine patterning, then sensitivity to exposure light source deteriorates, but thicker layers improve sensitivity
Solution Approach 1:
The patent changes the optical and chemical parameters of the resist underlayer by selecting specific polymer compositions with appropriate molecular weights and functional groups. These parameter optimizations enable the thin film to maintain sufficient light sensitivity and etch resistance, allowing fine patterning to be achieved without compromising exposure efficiency.
3Reliability
If conventional resist underlayer materials are used, then pattern collapse occurs during etching, but alternative materials may compromise coating uniformity
Solution Approach 1:
The patent develops a composite material formulation combining novolac resin, acrylic resin, and crosslinking agents in specific ratios. This composite structure provides both excellent coating uniformity through proper rheological properties and superior pattern integrity during etching through enhanced mechanical strength and chemical resistance achieved by the crosslinked network.
Solution Approach 2:
The patent applies local quality by creating a crosslinked network structure within the resist underlayer that provides enhanced mechanical support and adhesion specifically at the interfaces and within the film matrix. This localized reinforcement prevents pattern collapse during etching while maintaining overall coating uniformity through controlled composition and processing.
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 ensures excellent coating uniformity, improved sensitivity to exposure light, and effective pattern formation without collapsing, thereby enhancing the efficiency and quality of the patterning process.
Implementation Method 1
irradiating with activating radiation such as ultraviolet rays through a mask pattern on which a device pattern is drawn and then developing the resultant to obtain a photoresist pattern
Data Source
AI summary
A resist underlayer composition and a method of forming patterns using the resist underlayer composition are provided. The resist underlayer composition may include a polymer including a structural unit represented by Chemical Formula 1, a structural unit represented by Chemical Formula 2, or a combination thereof; a compound represented by Chemical Formula 3; and a solvent.