Resist Underlayer Composition for Fine Patterning
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Solution Overview
Problem
In the semiconductor industry, as patterns become finer, the resist underlayer must maintain uniform thickness and adhesion to prevent pattern collapse during etching, while also improving sensitivity to exposure light sources for efficient patterning.
Innovation Solution
A resist underlayer composition incorporating specific polymer structural units, such as those represented by Chemical Formulas 1, 2, and 3, which enhance adhesion, uniformity, and sensitivity, is used, along with a solvent and optional additives like surfactants or thermal acid generators, to form a stable and reactive radical-scavenging film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the resist underlayer thickness is reduced to enable finer patterns, then the photoresist layer thickness can be reduced for finer patterning, but the resist underlayer may collapse and fail to maintain uniform thickness and adhesion
Solution Approach 1:
The patent modifies the chemical composition parameters of the resist underlayer by incorporating specific polymer structural units (Chemical Formulas 1-3) with heterocyclic groups and carbonyl-containing groups. These compositional changes enhance adhesion and pattern stability, allowing the underlayer to maintain reliability at reduced thicknesses required for fine patterning.
Solution Approach 2:
The patent creates a composite resist underlayer material by combining multiple polymer structural units with different functional groups (heterocyclic groups for adhesion, carbonyl groups for etch resistance and uniformity). This composite approach enables the underlayer to simultaneously achieve thinness for fine patterning and sufficient mechanical stability to prevent collapse.
2Manufacturing precision
If the resist underlayer thickness is reduced for finer patterns, then the overall layer thickness decreases for better resolution, but the adhesion and uniformity of the resist underlayer deteriorate
Solution Approach 1:
The patent changes the chemical parameters of the resist underlayer by incorporating polymers with carbonyl-containing groups (Chemical Formulas 1-3). These groups improve etch resistance and film uniformity, enabling the underlayer to maintain compositional stability even at reduced thicknesses required for high-resolution patterning.
3Ease of manufacture
If conventional polymer structures are used in the resist underlayer, then the formulation is simpler and easier to manufacture, but the sensitivity to exposure light source is insufficient for efficient patterning
Solution Approach 1:
The patent modifies the chemical structure parameters of the polymer by incorporating heterocyclic groups (Chemical Formulas 1-3). These structural modifications enhance the material's sensitivity to exposure light sources, improving patterning efficiency while maintaining formulation feasibility through defined molecular structures.
Data Source
AI summary
Disclosed are a resist underlayer composition, and a method of forming a pattern using the resist underlayer composition. the resist underlayer composition includes a polymer including a structural unit represented by Chemical Formula 1, a structural unit represented by Chemical Formula 2, a structural unit represented by Chemical Formula 3, or a combination thereof and a solvent. The definitions of Chemical Formula 1 to Chemical Formula 3 are as described in the specification.