Aromatic Underlayer Materials for Planarizing Semiconductor Patterns
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Solution Overview
Problem
Existing underlayer materials for semiconductor manufacturing face challenges such as high cost, inability to form a planarizing layer over topography, high absorbance at 633 nm, and thermal instability, which affect pattern alignment and resist pattern collapse.
Innovation Solution
Aromatic core-based curable compounds with specific substituents are used to form an underlayer through spin-coating and thermal setting, providing antireflective and planarizing properties, and are thermally stable up to 400°C, allowing for efficient pattern transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CVD carbon is used as underlayer material, then antireflective properties are provided, but cost of ownership increases and ability to form planarizing layer is lost
Solution Approach 1:
The patent replaces expensive CVD carbon with inexpensive spin-coat applicable polymer materials that can be discarded after single use in the manufacturing process, significantly reducing cost of ownership while maintaining functional performance
Solution Approach 2:
The patent changes the physical and chemical parameters of the underlayer material by using polymers with specific glass transition temperatures (Tg) and carbon content ranges, enabling both cost reduction and planarizing capability while preserving antireflective properties
2Stability of the object's composition
If high molecular weight materials are used for underlayer, then thermal stability is improved, but viscosity increases and planarizing ability decreases
Solution Approach 1:
The patent optimizes the molecular weight parameter of the polymer to fall within a specific range that balances thermal stability requirements with sufficient流动性 for planarizing, avoiding both too low (poor stability) and too high (excessive viscosity) extremes
Solution Approach 2:
The patent uses composite polymer formulations combining different polymer components with complementary properties, where the mixture achieves optimal balance between thermal stability and viscosity that individual high molecular weight materials cannot provide
3Reliability
If materials with high carbon content are used for underlayer, then antireflective properties are enhanced, but thermal out-gassing increases
Solution Approach 1:
The patent precisely controls the carbon content parameter of the polymer within an optimized range, and adjusts the glass transition temperature to balance antireflective performance with reduced thermal out-gassing, avoiding excessive carbon content that would cause decomposition
Solution Approach 2:
The patent creates localized optimization by forming a dense, crosslinked polymer network structure through curing that concentrates carbon in specific regions to provide antireflective properties while the overall composition maintains low out-gassing characteristics
4Ease of manufacture
If spin-coat applicable materials are used for underlayer, then manufacturing complexity is reduced, but thermal stability above 400°C is compromised
Solution Approach 1:
The patent utilizes phase transition of the polymer through thermal curing that transforms the material from a thermoplastic state (spin-coat applicable) to a thermoset crosslinked network state (thermally stable above 400°C), enabling both ease of manufacture and high temperature stability
Solution Approach 2:
The patent performs preliminary spin-coating of the polymer material before thermal curing, allowing easy application and planarizing, then subsequently cures the material to achieve thermal stability, separating the manufacturing ease step from the thermal stability step
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 aromatic core-based underlayer materials enable low-cost, planarization, and thermal stability, reducing resist pattern collapse and enhancing pattern alignment in semiconductor manufacturing.
Implementation Method 1
curing the layer of the curable compound to form an underlayer
Implementation Method 2
thermally stable up to 400° C.
Data Source
AI summary
Compounds having three or more alkynyl moieties substituted with an aromatic moiety having one or more of certain substituents are useful in forming underlayers useful in semiconductor manufacturing processes.