Aromatic Polysiloxane Composition for Metal Oxide Resist Sensitivity
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Solution Overview
Problem
The existing metal oxide resist compositions face issues such as low exposure sensitivity, poor adhesion to base films, low etching selectivity, and a narrow process window, along with numerous defects during the manufacturing process.
Innovation Solution
A polysiloxane composition containing specific repeating units, such as phenyl, naphthyl, phenalenyl, or anthracenyl groups, is used to enhance the metal oxide resist, improving exposure sensitivity, adhesion, and etching selectivity by forming a polysiloxane film that enhances film adhesion and reduces defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal oxide resist composition is used for EUV lithography, then the resist material can be applied for advanced node manufacturing, but the exposure sensitivity is low
Solution Approach 1:
The patent changes the chemical composition parameters of the resist underlayer by introducing specific polysiloxane structures with aromatic side groups (phenyl, naphthyl, phenalenyl, phenanthrenyl, or anthracenyl) at defined positions relative to the silicon atom. This compositional parameter change enhances the interaction between the underlayer and metal oxide resist, thereby improving exposure sensitivity without compromising manufacturing efficiency.
Solution Approach 2:
The patent creates a composite resist underlayer system combining polysiloxane backbone with aromatic side groups. This composite structure provides both the mechanical stability of polysiloxane and the enhanced optical/chemical properties of aromatic groups, achieving improved exposure sensitivity while maintaining processability for efficient manufacturing.
2Reliability
If a metal oxide resist is used, then advanced lithography can be achieved, but the adhesion between metal oxide resist and base film is low
Solution Approach 1:
The polysiloxane underlayer acts as an intermediary layer between the base film and the metal oxide resist. The specific aromatic-substituted polysiloxane structure provides chemical and physical bonding sites that enhance adhesion to both the base film and the metal oxide resist, thereby improving adhesion strength while maintaining a sufficient process window for manufacturing.
3Reliability
If a metal oxide resist is used, then EUV lithography can be performed, but the etching selectivity between metal oxide resist and base film is low
Solution Approach 1:
The patent modifies the chemical composition parameters of the underlayer by incorporating specific aromatic groups at defined positions relative to the silicon atom in the polysiloxane structure. This parameter change creates chemical environments that enhance the etching selectivity between the metal oxide resist and base film, thereby improving pattern accuracy without compromising manufacturing feasibility.
4Reliability
If a metal oxide resist is used, then advanced node manufacturing can be achieved, but numerous defects are generated during the step
Solution Approach 1:
The patent employs a disposable, specifically designed polysiloxane underlayer composition that is optimized for single-use in the resist formation process. This underlayer is designed to be applied, cured, and then removed or integrated without causing defects, thereby reducing defect rates and improving manufacturing yield while maintaining productivity.
5Reliability
If a metal oxide resist is used, then EUV lithography can be performed, but the process window is narrow
Solution Approach 1:
The patent changes the compositional parameters of the underlayer by introducing polysiloxane structures with specific aromatic side groups at defined positions. This parameter change broadens the process window by improving the robustness of the resist system to variations in processing conditions, thereby enhancing process control and ease of manufacture while maintaining reliability.
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 composition significantly improves exposure sensitivity, ensures sufficient adhesion to base films, enhances etching selectivity, and widens the process window, reducing defects in the manufacturing process.
Implementation Method 1
irradiating the metal oxide resist underlayer with the energy ray
Data Source
AI summary
A polysiloxane composition having a repeating unit represented by the following formula (Ia) as defined herein is used to improve the exposure sensitivity of a metal oxide resist.