Resist Underlayer Composition for Thin High-Etch Semiconductor Films
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Solution Overview
Problem
Existing semiconductor substrate manufacturing processes face challenges in achieving a resist underlayer film with sufficient etching resistance, heat resistance, and bending resistance, which are crucial for advanced microfabrication of semiconductor devices.
Innovation Solution
A method involving a composition that includes a compound with a nitrogen-containing ring structure, such as a pyridine or pyrimidine ring, and a solvent, applied to a substrate to form a resist underlayer film, which is then patterned and used as a mask for etching, enhancing the film's resistance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional resist underlayer film materials are used, then the manufacturing process is simple, but the etching resistance, heat resistance, and bending resistance are insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the resist underlayer film by incorporating specific compounds with nitrogen-containing ring structures (pyridine or pyrimidine rings) combined with fluorinated groups. This chemical parameter change enhances etching resistance while maintaining processability through controlled synthesis of the compound structure.
Solution Approach 2:
The patent creates a composite material system by combining organic compounds with specific nitrogen-containing ring structures and fluorinated groups. This composite approach integrates multiple functional groups within a single molecular structure, achieving both high etching resistance and appropriate film formation properties.
2Manufacturing precision
If the resist underlayer film is made thinner to improve resolution, then the pattern precision improves, but the etching resistance and mechanical strength decrease
Solution Approach 1:
The patent changes the chemical composition parameters of the resist underlayer material to achieve higher etching resistance per unit thickness. By incorporating nitrogen-containing ring structures with fluorinated groups, the material density and chemical stability are enhanced, allowing thinner films to maintain sufficient etching resistance.
Solution Approach 2:
The patent replaces reliance on mechanical thickness for achieving etching resistance with chemical composition optimization. Instead of using thicker films for protection, the invention uses chemically resistant materials that provide adequate protection at reduced thickness, enabling better resolution.
3Reliability
If the resist underlayer film is made thicker to improve etching resistance, then the etching resistance improves, but the pattern resolution and bending resistance deteriorate
Solution Approach 1:
The patent optimizes the chemical composition parameters to achieve high etching resistance at minimal thickness. The specific compound structure with nitrogen-containing rings and fluorinated groups provides maximum chemical stability and etching resistance per unit thickness, eliminating the need for thick films.
Solution Approach 2:
The patent uses a thin, disposable-like resist underlayer film that is optimized for single-use in the etching process. The thin film design reduces interference with subsequent processing steps while the enhanced chemical composition ensures adequate etching resistance during its brief functional lifetime.
4Temperature
If conventional organic underlayer films are used, then the process is established and simple, but the heat resistance and bending resistance are insufficient for advanced microfabrication
Solution Approach 1:
The patent changes the thermal stability parameters of the resist underlayer material by incorporating nitrogen-containing ring structures. These aromatic heterocyclic structures provide inherent thermal stability and rigidity, enabling the film to withstand higher processing temperatures without degradation.
Solution Approach 2:
The patent creates a thermally stable composite material by combining nitrogen-containing ring structures with fluorinated groups. This composite structure provides both thermal resistance and mechanical stability, meeting the demanding requirements of advanced microfabrication processes.
Data Source
AI summary
A method for manufacturing a semiconductor substrate includes forming a resist underlayer film directly or indirectly on a substrate by applying a composition. The composition includes a compound and a solvent. The compound includes: at least one nitrogen-containing ring structure selected from the group consisting of a pyridine ring structure and a pyrimidine ring structure; and a partial structure represented by formula (1-1) or (1-2). X1 and X2 are each independently a group represented by formula (i), (ii), (iii), or (iv); * is a bond with a moiety of the compound other than the partial structure represented by formula (1-1) or (1-2); and Ar11 and Ar12 are each independently a substituted or unsubstituted aromatic ring having 5 to 20 ring members that forms a fused ring structure together with the two adjacent carbon atoms in the formulas (1-1) and (1-2).