Carbonyl-Linked Resist Underlayer Composition for Flat Stepped Wafer Coating
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Solution Overview
Problem
Existing resist underlayer film-forming compositions struggle to provide high etching resistance, good optical constants, and uniform coating on substrates with uneven surfaces, leading to irregular film thickness and poor coverage.
Innovation Solution
A resist underlayer film-forming composition comprising a solvent and a reaction product of a C6-C60 aromatic compound and a C3-C60 oxygen-containing compound with a carbon-oxygen double bond, where the oxygen-containing compound connects two aromatic compound molecules, along with optional crosslinking agents, acids, and acid generators, to form a flat film with minimal thickness variation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional resist underlayer film-forming compositions are applied to fill unevenness on stepped substrates, then coverage is attempted, but the film becomes irregular with large variation in film thickness
Solution Approach 1:
The patent modifies the chemical composition parameters of the resist underlayer film-forming material by incorporating specific compounds with carbonyl groups (such as cyclohexanone, γ-butyrolactone) and aromatic compounds. These compositional changes alter the fluidity and wetting properties of the coating solution, enabling it to better conform to uneven substrate surfaces while maintaining uniform film thickness after baking.
Solution Approach 2:
The patent creates a composite resist underlayer composition by combining multiple components: aromatic compounds, oxygen-containing compounds with carbonyl groups, and conventional resist underlayer materials. This composite formulation synergistically improves both the coverage on stepped substrates and the final film thickness uniformity, resolving the contradiction between coating performance and manufacturing precision.
2Reliability
If the composition is designed for high etching resistance, then etching performance improves, but optical constants may be compromised
Solution Approach 1:
The patent applies local quality by assigning different functional roles to different components of the composition. The aromatic compounds and oxygen-containing compounds provide etching resistance in specific regions of the film, while other components maintain the overall optical constants. This functional differentiation allows simultaneous achievement of high etching resistance and good optical properties.
Solution Approach 2:
By formulating a composite resist underlayer composition that includes etch-resistant aromatic compounds combined with oxygen-containing compounds that contribute to optical properties, the patent achieves both high etching resistance and good optical constants. The synergistic interaction between components resolves the trade-off between these two critical properties.
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, good optical constants, and excellent coverage on stepped substrates, enabling finer substrate processing and uniform film thickness.
Implementation Method 1
a reaction product of a C6-C60 aromatic compound (A) and a carbon-oxygen double bond contained in a C3-C60 oxygen-containing compound (B), the oxygen-containing compound (B) having one partial structure —CON
Data Source
AI summary
A resist lower layer film formation composition that exhibits a high etching resistance and a good dry-etching rate ratio and optical constant, exhibits good coating performance even on a so-called stepped substrate, produces a small film thickness difference after embedding, and enables a flat film to be formed. Also a method for manufacturing a polymer suitable for the resist lower layer film formation composition, a resist lower layer film in which the formation composition is used, and a method for manufacturing a semiconductor device. A resist lower layer film formation composition containing: a solvent; and a reaction product between an aromatic compound having 6-60 carbon atoms and a carbon-oxygen double bond of an oxygen-containing compound having 3-60 carbon atoms. The oxygen-containing compound has, in one molecule, one partial structure: —CON< or —COO—. In the reaction product, one carbon atom of the oxygen-containing compound links two of the aromatic compounds.