Radiation-Sensitive Resist Composition for Thick-Film Adhesion
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Solution Overview
Problem
The adhesiveness between a resist film and a substrate is reduced, especially in a dry state, as film thickness increases, leading to sensitivity reduction and peeling issues, which are not effectively addressed by altering the resist composition to improve adhesiveness without impairing sensitivity.
Innovation Solution
An actinic ray-sensitive or radiation-sensitive resin composition is formulated with specific components including a resin that increases polarity with acid action, a photoacid generator, and an amine oxide, with controlled amine oxide content and acid diffusion control agents, to enhance adhesiveness while minimizing sensitivity reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the film thickness of the resist is increased to accommodate higher capacity memory devices, then the capacity and functionality of the device are improved, but the adhesiveness between the resist film and substrate deteriorates, causing peeling and sensitivity reduction
Solution Approach 1:
The patent changes the chemical composition parameters of the resist film by incorporating specific amine oxide compounds (such as N-methyl-2-pyrrolidone and N,N-dimethylformamide) at controlled concentrations (0.01-1000 ppm). This chemical parameter modification enhances the adhesiveness of thick resist films to substrates without compromising sensitivity, allowing the resist to maintain reliable bonding even at increased film thicknesses required for high-capacity memory devices
Solution Approach 2:
The patent creates a composite resist composition by combining traditional resist materials with amine oxide compounds. This composite formulation integrates the adhesive properties of amine oxides with the photoresist characteristics of the base resin, achieving both improved adhesiveness for thick films and maintained sensitivity for pattern formation
2Volume of moving object
If the film thickness of the resist is increased, then the capacity of the memory device is improved, but the sensitivity of the resist is reduced due to increased absorbance
Solution Approach 1:
The patent modifies the optical and chemical parameters of the resist composition by adding amine oxide compounds that have favorable absorbance characteristics. These compounds allow the resist film to maintain adequate sensitivity to exposure light even at increased thicknesses, enabling pattern formation while accommodating the higher capacity requirements of advanced memory devices
3Reliability
If the resist composition is altered to improve adhesiveness, then the adhesiveness is improved, but the basic performance such as sensitivity is impaired
Solution Approach 1:
The patent applies local quality by introducing amine oxide compounds at specific, controlled concentrations (0.01-1000 ppm) within the resist composition. This localized chemical modification targets specifically the adhesive interface between the resist and substrate without fundamentally altering the bulk photoresist properties, thereby improving adhesiveness while preserving sensitivity and other basic performance characteristics
Solution Approach 2:
The patent carefully controls the concentration parameter of amine oxide additives to optimize the balance between adhesiveness and sensitivity. By maintaining amine oxide content within the specific range of 0.01-1000 ppm, the composition achieves enhanced adhesive performance while preventing excessive additive content from interfering with the photoresist's sensitivity and pattern formation capabilities
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 excellent adhesiveness to the substrate, particularly in a dry state, while maintaining sensitivity, by incorporating amine oxide within a specific concentration range and controlling acid diffusion, thereby forming reliable resist patterns.
Implementation Method 1
a photoacid generator included in the exposed area decomposes upon irradiation with light to generate an acid
Implementation Method 2
a resin having a polarity that increases by an action of an acid
Implementation Method 3
an acid diffusion control agent, excluding an acid diffusion control agent that corresponds to the amine oxide
Data Source
AI summary
An actinic ray-sensitive or radiation-sensitive resin composition contains (A) a resin having a polarity that increases by an action of an acid, (B) a photoacid generator, (P) an amine oxide, and (D) an acid diffusion control agent provided that acid diffusion control agents corresponding to the amine oxide are excluded, in which a content of the amine oxide (P) is from 0.01 ppm to 1,000 ppm with respect to a total mass of the actinic ray-sensitive or radiation-sensitive resin composition, and a mass ratio of the acid diffusion control agent (D) to the amine oxide (P) is more than 1 and 10,000 or less.