Light-Patterning Polymer Coatings for Semiconductor Surface Modification
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Solution Overview
Problem
Current methods for modifying surfaces in microelectronic device fabrication to achieve hydrophobic or oleophobic properties are limited by the need for complex processing, high material thickness, sensitivity to contamination, and lack of photo-patterning capabilities, particularly in the semiconductor industry.
Innovation Solution
A method involving a substrate with optional intermediate layers, where a surface modifying composition comprising a polymer with specific monomers, including a surface modifying group and a light-sensitizing group, is applied and selectively exposed to light to create a patterned surface modifying layer without fluorine atoms, allowing for the removal of unexposed portions while maintaining light-exposed portions on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional hydrophobic materials (Rain-X, Scotchgard) are used to modify surfaces, then hydrophobic properties are achieved, but they fail to provide performance with solvents and require material thickness much greater than can be used in semiconductor processes
Solution Approach 1:
The patent changes the chemical composition parameters by using a polymer with specific monomers containing surface-modifying groups and light-sensitive groups, replacing conventional materials. This allows achieving hydrophobic properties with much thinner film thickness suitable for semiconductor processes while maintaining solvent compatibility
Solution Approach 2:
The patent employs a composite polymer structure combining surface-modifying monomers (providing hydrophobicity) and light-sensitive monomers (enabling patterning). This composite approach integrates multiple functions into a single thin film layer, eliminating the need for thick conventional coatings
2Reliability
If self-assembled monolayers (SAMs) are used to create hydrophobic surfaces, then high contact angles are achieved, but lengthy and complicated exposure times are required and they are sensitive to substrate contamination
Solution Approach 1:
The patent modifies the exposure time parameter by incorporating light-sensitive groups directly into the polymer structure. This enables rapid photopatterning with standard UV exposure times, eliminating the lengthy exposure required by SAMs while maintaining high contact angles through the surface-modifying monomer groups
Solution Approach 2:
The patent uses a disposable polymer coating that can be quickly applied and patterned, replacing the time-consuming SAM formation process. The polymer provides sufficient hydrophobic performance without requiring the prolonged exposure and precise substrate preparation that SAMs demand
3Reliability
If standard SAMs are used for surface modification, then hydrophobic properties are achieved, but they do not allow for photo-patterning and require custom module for fab-based processing
Solution Approach 1:
The patent creates a universal polymer coating that simultaneously provides hydrophobic properties (through surface-modifying monomers) and photo-patterning capability (through light-sensitive monomers). This multi-functional material can be processed using standard semiconductor fabrication equipment, eliminating the need for custom modules while maintaining excellent hydrophobic performance
Solution Approach 2:
The patent merges the hydrophobic function and the photo-patterning function into a single polymer layer. By combining surface-modifying groups and light-sensitive groups in the same polymer chain, the material achieves both hydrophobicity and patternability, replacing the separate SAM and photoresist layers
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
This approach enables efficient and patterned surface modification with improved hydrophobic or oleophobic properties, reducing material thickness and processing complexity, and allowing for photo-patterning, thus addressing the limitations of existing methods in the semiconductor industry.
Implementation Method 1
selectively exposing the surface modifying layer to light having a wavelength between about 100 nm and about 700 nm to provide light-exposed portions of the surface modifying layer and unexposed portions of the surface modifying layer
Data Source
AI summary
Materials and methods for modifying surfaces in order to change surface energy are provided. These surface properties cause the surface to become more hydrophobic or oleophobic after light exposure. The ability to change surface energy upon exposure allows these materials to be patterned and enables a variety of uses, notably for use on semiconductor substrates in photolithography.