Coating Composition for Planarization via Delayed Crosslinking
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Solution Overview
Problem
Conventional photo-crosslinkable materials for resist underlayer films face issues with insufficient filling into substrate patterns and impaired planarity due to thermal shrinkage and degassing during heating, which affects the formation of a planarized coating film.
Innovation Solution
A multi-level substrate coating composition comprising a compound with specific partial structures (Formula A-1, A-2, or A-3) and a solvent, which can be cured by photoirradiation or heating, preventing crosslinking reactions at low temperatures and minimizing thermal shrinkage, thereby ensuring sufficient filling and planarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photo-crosslinkable materials are heated for filling into patterns, then crosslinking reaction proceeds, but viscosity increases causing insufficient filling into the pattern
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer by introducing specific side chain structures (Formula A-1, A-2, or A-3) that delay crosslinking initiation temperature to 200°C or higher. This parameter change allows the material to maintain low viscosity at lower temperatures for proper filling, then crosslink at higher temperatures for structural stability.
2Reliability
If conventional photo-crosslinkable materials are heated for curing, then crosslinking occurs, but thermal shrinkage causes impaired planarity
Solution Approach 1:
The patent changes the thermal properties of the polymer by selecting specific backbone structures and side chains that exhibit minimal thermal shrinkage above the glass transition temperature. This allows curing at elevated temperatures without compromising the planarity of the coating film.
3Reliability
If conventional photo-crosslinkable materials are heated, then crosslinking reaction proceeds, but degassing occurs causing insufficient filling
Solution Approach 1:
The patent changes the thermal stability parameters of the polymer by selecting chemically stable backbone structures and side chains that do not undergo decomposition or gas evolution at crosslinking temperatures. This eliminates degassing issues while maintaining effective crosslinking.
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 achieves excellent planarity and filling on multi-level substrates without thermal shrinkage, enabling the formation of a high-quality planarization film through controlled curing processes, either by light exposure or heat, with high production efficiency.
Implementation Method 1
the composition is cured by photoirradiation or heating
Implementation Method 2
the composition is cured by photoirradiation or heating
Data Source
AI summary
A composition having a multi-level substrate coating composition for forming a coating film having a filling onto a pattern and planarization, wherein the composition includes a compound (A) serving as a main agent, and a solvent, wherein the compound (A) forms the following Formula (A-1), (A-2) and (A-3); In Formulas (A-1), (A-2) and (A-3), a broken line is a bond to the aromatic ring; the aromatic ring forming a polymer skeleton or forming a monomer; and n is an integer of 1 or 2; A chain line is a bond to a carbon chain, alicyclic carbon ring, or aromatic ring forming a polymer skeleton; Q is a single bond, or an organic group having an ether bond, an ester bond, a urethane bond, a C1-3 alkylene bond, or an amide bond; m is 1; and Formula (A-3) does not include Formula (A-1), and the composition is cured photoirradiation or heating.