Selective Liquiphobic Coating for Semiconductor Surface Energy Control
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Solution Overview
Problem
Current methods for achieving high contact angles with water or solvents in the semiconductor industry are inefficient, as materials like Rain-X and Scotchgard require complex processing and are not suitable for semiconductor manufacturing, while self-assembled monolayers (SAMs) are limited, sensitive to contamination, and require lengthy exposure times.
Innovation Solution
A method involving a composition of polymers with specific monomers, including fluorinated monomers, that chemically or physically bond to the surface, reducing surface energy and forming a layer with a contact angle greater than 90° and a thickness of less than 30 nm, allowing for selective surface modification in the semiconductor industry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If materials like Rain-X or Scotchgard are used to achieve high contact angles, then hydrophobic performance is improved, but processing complexity increases and suitability for semiconductor manufacturing decreases
Solution Approach 1:
The patent changes the chemical composition parameters by using silane-based materials with specific functional groups (alkoxy, hydroxyl, carboxyl, amine) that can form covalent bonds with substrate surfaces. This chemical parameter change enables the material to achieve high hydrophobic performance through self-assembly and chemical bonding rather than complex processing, making it suitable for semiconductor manufacturing
Solution Approach 2:
The silane-based coating composition performs self-assembly on the substrate surface, automatically forming a hydrophobic layer through chemical bonding without requiring complex external processing equipment or multi-step procedures. The material self-organizes into a functional coating that provides high contact angles, eliminating the need for specialized processing modules
2Reliability
If self-assembled monolayers (SAMs) are used to modify the surface, then hydrophobic behavior is achieved, but exposure time increases and commercial availability decreases
Solution Approach 1:
The patent uses composite silane materials that combine the surface-modifying properties of SAMs with the advantages of polymer coatings. The silane-based composition forms a cross-linked network structure that achieves high hydrophobic behavior rapidly without the lengthy exposure times required by traditional SAMs, while also improving commercial availability and processability
Solution Approach 2:
The patent changes the temporal parameter by formulating silane-based compositions that cure and form hydrophobic layers much faster than traditional SAMs. The chemical reactivity and cross-linking mechanisms of silanes enable the formation of stable hydrophobic surfaces in minutes rather than hours, dramatically reducing exposure time
3Manufacturing precision
If fluorinated compounds are used to create hydrophobic surfaces, then contact angle is improved, but material complexity and processing requirements increase
Solution Approach 1:
The patent applies local quality by incorporating fluorinated groups specifically at the outer surface of the silane coating network, while the bulk material consists of simpler silane structures. This localized fluorination provides high contact angles and hydrophobic performance without requiring the entire material system to be complex fluorinated compounds, simplifying processing while maintaining manufacturing precision
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 solution enables efficient and selective surface modification with high contact angles, tolerating high temperatures and minimizing contamination risks, making it suitable for semiconductor manufacturing processes.
Implementation Method 1
The composition is heated to form a layer having a second surface with a second surface energy that is different from the initial surface energy
Implementation Method 2
The first monomer comprises at least one functional group that chemically bonds with the surface, physically attaches to the surface, or both
Implementation Method 3
The composition is heated to form a layer
Data Source
AI summary
Materials and methods for modifying semiconducting substrate surfaces in order to dramatically change surface energy are provided. Preferred materials include perfluorocarbon molecules or polymers with various functional groups. The functional groups (carboxylic acids, hydroxyls, epoxies, aldehydes, and/or thiols) attach materials to the substrate surface by physical adsorption or chemical bonding, while the perfluorocarbon components contribute to low surface energy. Utilization of the disclosed materials and methods allows rapid transformation of surface properties from hydrophilic to hydrophobic (water contact angle 120° and PGMEA contact angle) 70°. Selective liquiphobic modifications of copper over Si/SiOx, TiOx over Si/SiOx, and SiN over SiOx are also demonstrated.