Aromatic Resist Underlayer Film Formation via Low-Oxygen Heating
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Solution Overview
Problem
In semiconductor manufacturing, existing resist underlayer films with high carbon content suffer from insufficient etching resistance, leading to dimensional variability in pattern transfer during substrate processing.
Innovation Solution
A method involving the application of a composition containing an aromatic ring compound on a substrate, followed by heating in a low oxygen atmosphere between 450°C and 800°C to form a resist underlayer film with enhanced etching resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If materials with large carbon content are used for resist underlayer films, then etching resistance is improved, but manufacturing precision deteriorates due to dimensional variability in pattern transfer
Solution Approach 1:
The patent changes the chemical composition parameters of the resist underlayer film by using compounds with aromatic rings (such as phenol novolak resin, acenaphthylene polymer, or xylene orange) instead of conventional high carbon content materials. This compositional parameter change achieves both improved etching resistance and reduced dimensional variability, resolving the technical contradiction between reliability and manufacturing precision
Solution Approach 2:
The patent employs composite material strategies by formulating the resist underlayer film from specific aromatic ring-containing compounds that combine the desired etching resistance properties with controlled dimensional stability. The use of these specialized compounds creates a composite structure that simultaneously satisfies both etching resistance and pattern transfer accuracy requirements
2Reliability
If heating temperature is increased to improve film formation, then etching resistance is enhanced, but harmful factors increase due to potential substrate damage
Solution Approach 1:
The patent optimizes the heating temperature parameter within a specific range (450°C to 800°C) to achieve the desired film properties without causing substrate damage. This precise parameter control allows the resist underlayer film to develop sufficient etching resistance while avoiding thermal degradation of the substrate, thus resolving the contradiction between enhancing reliability and preventing harmful effects
3Stability of the object's composition
If oxygen concentration is increased during heating, then oxidation occurs improving film stability, but etching resistance deteriorates
Solution Approach 1:
The patent employs an inert or low-oxygen atmosphere during the heating process to prevent oxidation of the resist underlayer film while maintaining film stability. By controlling the atmospheric composition (using nitrogen or other inert gases), the patent achieves both compositional stability and high etching resistance, resolving the technical contradiction between these two 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 method produces a resist underlayer film with superior etching resistance, enabling precise pattern transfer and improved pattern configuration on substrates, suitable for advanced semiconductor devices.
Implementation Method 1
The coating film is heated in an atmosphere in which an oxygen concentration is less than 1% by volume and a temperature is higher than 450° C. and 800° C. or lower, to form a film on the substrate
Data Source
AI summary
A method comprises applying a composition on a substrate to form a coating film on the substrate. The coating film is heated in an atmosphere in which an oxygen concentration is less than 1% by volume and a temperature is higher than 450° C. and 800° C. or lower, to form a film on the substrate. The composition comprises a compound comprising an aromatic ring. The oxygen concentration in the atmosphere during the heating of the coating film is preferably no greater than 0.1% by volume. The temperature in the atmosphere during the heating of the coating film is preferably 500° C. or higher and 600° C. or lower.