Hardmask Composition for Ultra-Fine Semiconductor Patterning
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Solution Overview
Problem
Current semiconductor manufacturing techniques face challenges in forming ultra-fine patterns of several to several tens of nanometers in size, particularly in achieving effective hardmask layers with optimal heat resistance, etch resistance, gap-fill characteristics, and planarization, while maintaining solubility for spin-on coating methods.
Innovation Solution
A hardmask composition comprising specific monomers and polymers, represented by Chemical Formulas 1, 2, and 3, combined with solvents like propylene glycol monomethylether acetate, which are heat-treated to form a hardmask layer that provides improved mechanical, thermal, and etch resistance properties, along with excellent gap-fill and planarization characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hardmask materials are used, then the process is simple, but the heat resistance and etch resistance are insufficient for ultra-fine patterning
Solution Approach 1:
The patent employs a composite material system consisting of a polymer matrix (polycyclic aromatic hydrocarbon derivative) combined with specific small molecule additives. This composite structure provides both the required heat resistance and etch resistance while maintaining solubility for spin-on coating, resolving the contradiction between performance and complexity.
Solution Approach 2:
The patent modifies the chemical parameters of the hardmask material by introducing specific functional groups (such as carbonyl, hydroxyl, and carboxyl groups) and controlling molecular weight and polydispersity. These parameter changes enable the material to achieve optimal heat resistance, etch resistance, and solubility simultaneously.
2Reliability
If the hardmask layer is made more resistant to heat and etching, then the pattern durability improves, but the solubility for spin-on coating decreases
Solution Approach 1:
The patent introduces specific functional groups at localized positions within the polymer structure. These local modifications (such as introducing polar groups for solubility while maintaining the hydrophobic backbone for resistance) allow the material to exhibit different properties in different regions of the molecule, achieving both solubility and durability.
Solution Approach 2:
The patent carefully controls the molecular weight (5,000-50,000 g/mol) and polydispersity (1.05-1.30) parameters of the polymer. These parameter optimizations ensure that the material remains soluble enough for spin-on coating while maintaining sufficient molecular size for heat and etch resistance.
3Length of moving object
If the pattern size is reduced to several to several tens of nanometers, then the device miniaturization is achieved, but the manufacturing precision and pattern fidelity become difficult to maintain
Solution Approach 1:
The patent performs preliminary optimization of the hardmask material properties before the patterning process. By pre-adjusting the polymer's molecular weight, functional group distribution, and crosslinking density, the material is prepared in advance to maintain its structural integrity and pattern fidelity during subsequent ultra-fine lithography and etching processes.
Solution Approach 2:
The patent utilizes parameter changes in the hardmask material (such as crosslinking density and functional group concentration) to control the pattern formation process. These parameter adjustments enable precise pattern transfer at ultra-fine dimensions while maintaining manufacturing precision through optimized material response to processing conditions.
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 enables the formation of high-quality patterns with enhanced heat resistance, etch resistance, and planarization, suitable for high-temperature processes and multiple etching steps, while maintaining solubility for efficient spin-on coating.
Implementation Method 1
heat-treated to form a hardmask layer that provides improved mechanical, thermal, and etch resistance properties
Implementation Method 2
a cross-linked network structure formed by a monomer and a polymer
Data Source
AI summary
A hardmask composition includes a monomer represented by the following Chemical Formula 1, a polymer including a moiety represented by the following Chemical Formula 2, a polymer including a moiety represented by the following Chemical Formula 3, or a combination thereof, and a solvent,