Polysiloxane Underlayer for Self-Assembled Film Etching
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Solution Overview
Problem
Existing self-assembled film technologies face challenges in easily arranging a desired vertical pattern and preventing intermixing with upper layers during pattern etching, while also requiring resistance to oxygen gas.
Innovation Solution
A polysiloxane-based underlayer film-forming composition, specifically a hydrolysis-condensation product of phenyl group-containing silanes, is used to create a microphase-separated structure that prevents intermixing and maintains resistance during oxygen gas etching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional underlayer film is used for self-assembled films, then the block polymer can be arranged into patterns, but the underlayer film mixes with the upper layer and loses resistance during oxygen gas etching
Solution Approach 1:
The underlayer film uses a composite structure combining polysiloxane (provides resistance and stability) with specific polymer components (enables pattern formation). This composite approach allows the film to simultaneously achieve layer stability, resistance during etching, and pattern arrangement capability without mixing with upper layers.
Solution Approach 2:
The underlayer film is designed with specific local properties: the polysiloxane provides resistance and stability in regions requiring protection during etching, while the polymer components provide pattern-forming capability in regions where self-assembly occurs. This local differentiation resolves the contradiction between resistance and pattern formation.
2Reliability
If a polysiloxane-based underlayer film is used to prevent intermixing and provide resistance, then layer stability and etching resistance are improved, but the complexity of the film-forming composition increases
Solution Approach 1:
The patent optimizes specific parameters of the polysiloxane (content range of 5-50 mass%, specific molecular weight, degree of hydrolysis) to achieve the desired balance between resistance and pattern formation capability. By carefully controlling these parameters, the complexity is managed while maintaining reliability.
Solution Approach 2:
The film-forming composition is designed with specific local functions: polysiloxane provides resistance and stability in the underlayer, while the block copolymer provides pattern formation in the upper layer. This functional differentiation allows each component to be optimized independently, managing overall system complexity.
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 polysiloxane-based underlayer film enables the formation of perpendicular microphase-separated structures in self-assembled films, ensuring pattern integrity and resistance to oxygen gas etching.
Implementation Method 1
the polysiloxane is a hydrolysis-condensation product of a silane containing a phenyl group-containing silane
Implementation Method 2
an underlayer film that causes no intermixing (layer mixing) with a self-assembled film as the upper layer
Implementation Method 3
has resistance to oxygen gas during pattern etching of the self-assembled film
Data Source
AI summary
An underlayer film-forming composition used for an underlayer for a self-assembled film, including a polysiloxane and a solvent. The polysiloxane may be a hydrolysis-condensation product of a silane containing a phenyl group-containing silane, or a hydrolysis-condensation product of a silane containing a silane of Formula (1) in a ratio of 10 to 100% by mol relative to the total silane, or a hydrolysis-condensation product of silanes containing the silane of Formula (1), silane of Formula (2) [R4Si(R3)3 (2)], and silane of Formula (3) [Si(R5)4 (3)] in a ratio of silane of Formula (1): silane of Formula (2): silane of Formula (3) of 10 to 100:0 to 90:0 to 50 in terms of % by mol relative to the total silane.