Substituted Biphenylene Hardmask for Ultra-Fine Patterning
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Solution Overview
Problem
The semiconductor industry faces challenges in forming ultra-fine patterns with existing hardmask compositions, which lack sufficient etch resistance and chemical resistance for advanced lithographic techniques.
Innovation Solution
A hardmask composition is developed that includes a solvent and a polymer with a substituted biphenylene structural unit, where phenylene moieties are substituted with hydroxy-substituted aryl or heteroaryl groups, forming a condensed polycyclic aromatic hydrocarbon upon curing, enhancing etch and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardmask compositions are used, then the manufacturing process is simple, but the etch resistance and chemical resistance are insufficient for ultra-fine patterning
Solution Approach 1:
The patent employs a composite polymer structure combining biphenylene backbone with hydroxy-substituted aryl or heteroaryl groups. This composite molecular architecture provides both the structural integrity needed for etch resistance and the chemical functionality for crosslinking, directly resolving the contradiction between simplicity and performance by integrating multiple functions into a unified material system.
Solution Approach 2:
The patent modifies the polymer's chemical parameters by introducing specific functional groups (hydroxy-substituted aryl or heteroaryl groups) that enable crosslinking reactions. This parameter change transforms the polymer from a simple structure with poor resistance to a crosslinked network structure with enhanced etch and chemical resistance, while maintaining reasonable structural complexity.
2Manufacturing precision
If existing hardmask materials are used, then the process is easier to manufacture, but the profile quality and stability during etching are poor
Solution Approach 1:
The patent performs preliminary crosslinking action during the hardmask formation process by incorporating crosslinkable functional groups into the polymer structure. This preliminary chemical modification creates a stable, crosslinked network before the etching process begins, ensuring profile quality and stability during etching without requiring complex post-processing steps.
Solution Approach 2:
The patent changes the chemical parameters of the hardmask material by introducing crosslinkable functional groups that react to form a three-dimensional network. This parameter change enhances the material's structural stability and etch resistance, improving pattern profile quality while the crosslinking process remains compatible with existing manufacturing workflows.
3Reliability
If simple polymer structures are used, then the synthesis is easier, but the chemical resistance and etch resistance are insufficient
Solution Approach 1:
The patent creates a composite polymer molecular structure where the biphenylene backbone provides structural stability and the hydroxy-substituted aryl or heteroaryl groups provide crosslinking functionality. This composite structure achieves high chemical and etch resistance through the synergistic combination of rigid aromatic rings and reactive functional groups, resolving the contradiction between structural simplicity and performance.
Solution Approach 2:
The patent applies local quality by placing specific functional groups (hydroxy-substituted aryl or heteroaryl groups) at strategic positions on the polymer chain. These localized functional regions provide crosslinking sites that enhance overall chemical and etch resistance without requiring the entire polymer structure to be complex, thus achieving high reliability with controlled structural complexity.
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 hardmask composition improves etch resistance and chemical resistance, enabling the formation of fine patterns with improved profile quality and stability during subsequent etching processes.
Implementation Method 1
a polymer that includes a substituted biphenylene structural unit, wherein one phenylene of the biphenylene of the substituted biphenylene structural unit is substituted with at least one of a hydroxy-substituted C6 to C30 aryl group, and a hydroxy-substituted C3 to C30 heteroaryl group
Data Source
AI summary
A hardmask composition, a hardmask layer, and a method of forming patterns, the composition including a solvent; and a polymer that includes a substituted biphenylene structural unit, wherein one phenylene of the biphenylene of the substituted biphenylene structural unit is substituted with at least one of a hydroxy-substituted C6 to C30 aryl group, and a hydroxy-substituted C3 to C30 heteroaryl group.