Resist Underlayer Film Composition for Heat-Resistant Flat Coatings
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Solution Overview
Problem
Current resist underlayer films in semiconductor manufacturing lack sufficient heat resistance and flatness, which are essential for advanced microfabrication and pattern transfer during semiconductor substrate processing.
Innovation Solution
A method involving a composition for forming a resist underlayer film, which includes a compound with an aromatic ring and a polymer that thermally decomposes at elevated temperatures, applied to a substrate and heated between 450°C and 600°C in a low-oxygen atmosphere, enhancing heat resistance and flatness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a high carbon content material is used for resist underlayer film, then etching resistance is improved, but heat resistance is insufficient
Solution Approach 1:
The patent uses a composite material system consisting of a phenol novolak resin (providing etching resistance through high carbon content) combined with a polyhydric alcohol compound (providing heat resistance through thermal stability up to 600°C or higher). This composite approach allows the resist underlayer film to simultaneously achieve both etching resistance and sufficient heat resistance for advanced semiconductor manufacturing processes.
2Strength
If conventional resist underlayer film materials are used, then etching resistance is achieved, but flatness is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the resist underlayer film by incorporating polyhydric alcohol compounds with specific molecular structures (containing multiple hydroxyl groups). This compositional parameter change improves the film's thermal stability and reduces thermal stress during high-temperature processing, thereby enhancing flatness while maintaining etching resistance.
3Temperature
If high temperature heating is applied to improve heat resistance, then thermal stability is enhanced, but material decomposition occurs
Solution Approach 1:
The patent selects polyhydric alcohol compounds with specifically designed molecular weights (typically 100-10,000) and structural parameters that provide thermal stability up to 600°C or higher without decomposition. By carefully controlling these material parameters, the resist underlayer film maintains compositional stability during high-temperature heating processes while achieving the required heat resistance.
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 method produces a resist underlayer film with improved heat resistance and flatness, enabling more precise and efficient semiconductor substrate manufacturing, particularly for future microfabrication needs.
Implementation Method 1
a polymer which thermally decomposes at the heating temperature in heating the coating film
Implementation Method 2
heating the coating film at a heating temperature of higher than 450° C. and 600° C. or lower in an atmosphere having an oxygen concentration of less than 0.01% by volume
Data Source
AI summary
A method for forming a resist underlayer film includes applying a composition for forming a resist underlayer film directly or indirectly to a substrate to form a coating film. The coating film is heated at a heating temperature of higher than 450° C. and 600° C. or lower in an atmosphere having an oxygen concentration of less than 0.01% by volume. The composition for forming a resist underlayer film includes: a compound including an aromatic ring; a polymer which thermally decomposes at the heating temperature in heating the coating film, and which is other than the compound; and a solvent. The compound has a molecular weight of 400 or more. A content of the polymer is less than a content of the compound in the composition for forming a resist underlayer film.