Resist Underlayer Composition for Flat Coating on Stepped Substrates
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Solution Overview
Problem
Resist underlayer films struggle to form a flat and uniform layer on substrates with uneven surfaces, such as stepped substrates, due to poor coating and large variations in film thickness, which hinders the miniaturization of resist patterns and the effectiveness of lithographic processes.
Innovation Solution
A resist underlayer film-forming composition comprising a solvent and a reaction product between a C6-C60 aromatic compound and a C3-C60 cyclic carbonyl compound, where the cyclic carbonyl compound contains at least 5% by mass of heteroatoms, is used to create a film with high etching resistance and good optical constants, enabling effective coverage and flattening on uneven substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional resist underlayer film-forming composition is applied to fill unevenness on a stepped substrate, then the composition attempts to cover the substrate surface, but the film exhibits large variation in thickness and poor coating uniformity
Solution Approach 1:
The patent changes the chemical parameters of the film-forming composition by incorporating cyclic carbonyl compounds with specific heteroatom content (at least 5% by mass) and specific structural features. These parameter changes in composition chemistry improve the film's ability to form uniform coatings on uneven substrates, resolving the contradiction between film thickness uniformity and coating performance on stepped substrates.
Solution Approach 2:
The patent uses a composite material system combining aromatic compounds with cyclic carbonyl compounds containing heteroatoms. This composite approach creates a film-forming composition that simultaneously achieves high etching resistance, good optical constants, and improved coating uniformity on stepped substrates, addressing multiple contradictory requirements through material composition rather than single-component solutions.
2Manufacturing precision
If the resist underlayer film is made thinner to enable resist pattern miniaturization, then higher precision patterning is achieved, but the film becomes more sensitive to thickness variation and coating defects
Solution Approach 1:
By changing the chemical composition parameters to include cyclic carbonyl compounds with specific heteroatom content and structural characteristics, the patent improves the film's intrinsic properties. This allows thinner films to be formed with reduced sensitivity to thickness variation and coating defects, enabling resist pattern miniaturization while maintaining reliability.
3Reliability
If the resist underlayer film is designed for high etching resistance, then etching performance is improved, but the film may exhibit poor optical constants affecting lithographic exposure
Solution Approach 1:
The patent employs a composite material system where aromatic compounds provide etching resistance while cyclic carbonyl compounds with heteroatoms contribute to good optical constants. This composite approach balances the contradictory requirements of high etching resistance and appropriate optical properties for lithographic exposure, achieving both functions simultaneously rather than prioritizing one at the expense of the other.
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 high etching resistance and a good dry etching rate ratio, allowing for the formation of a flat resist underlayer film with minimal thickness variation on stepped substrates, enhancing the precision of semiconductor manufacturing processes.
Implementation Method 1
a reaction product between a C6-C60 aromatic compound (A) and a carbonyl group of a C3-C60 cyclic carbonyl compound (B)
Data Source
AI summary
A resist underlayer film-forming composition formed into a flat film which can exhibit high etching resistance, a good dry etching velocity ratio and a good optical constant, has a good covering property even against a so-called step-structure substrate, and has a small film thickness difference after being embedded. Also, a method for producing a polymer suitable for the resist underlayer film-forming composition; a resist underlayer film using the resist underlayer film-forming composition; and a method for manufacturing a semiconductor device. A resist underlayer film-forming composition containing a reaction product of an aromatic compound having 6 to 60 carbon atoms with a carbonyl group in a cyclic carbonyl compound having 3 to 60 carbon atoms and a solvent, wherein the reaction product has such a structure that one of the carbon atoms in the cyclic carbonyl compound links two molecules of the aromatic compound to each other.