Silicon-Based Tri-Layer Anti-Reflective Coating for Photolithography
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Solution Overview
Problem
Conventional tri-layer resist methods face challenges in achieving accurate pattern dimensions due to excessive light reflection from the surface of the bottom and intermediate layers, leading to reduced accuracy in photolithography processes, especially at smaller feature sizes, and difficulties in integrating a compatible intermediate material between organic and photoresist layers.
Innovation Solution
Development of a tri-layer composition comprising a silicon-based polymer matrix with vinyl and phenyl groups, condensation catalysts, and solvents, which absorbs uniformly in the ultraviolet spectral region, enhances adhesion between layers, and provides high etch selectivity, stability, and shelf life, allowing for improved photoresist patterning and reduced light reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional tri-layer resist method is used, then the photolithography process can be performed, but light reflection from the surface of the bottom and intermediate layers reduces the accuracy of pattern dimensions
Solution Approach 1:
The patent applies anti-reflective coating materials that convert harmful light reflection into beneficial light absorption. The coating contains compounds with high absorption coefficients at the lithography wavelength, which absorb the reflected light and convert it to heat, eliminating the harmful reflection effect while maintaining the structural integrity of the tri-layer system
Solution Approach 2:
The patent uses composite anti-reflective coating materials comprising multiple components including silane-based compounds, aromatic compounds, and other functional additives. This composite structure allows the coating to simultaneously provide anti-reflective properties, adhesion to underlying layers, and compatibility with the photolithography process
2Reliability
If an intermediate hardmask layer is used to enable effective pattern transfer, then etching resistance is improved, but integration with organic and photoresist layers becomes difficult due to chemistry incompatibility
Solution Approach 1:
The patent modifies the chemical parameters of the intermediate layer by using silane-based compounds with adjustable functional groups. By changing the chemical composition and crosslinking density of the silane network, the material achieves both high etching resistance and compatibility with organic underlayers and photoresist layers, resolving the integration difficulty
Solution Approach 2:
The silane-based intermediate layer acts as a chemical intermediary between the organic underlayer and the photoresist layer. The intermediate layer contains functional groups that can bond to both organic materials and provide inorganic-like etching resistance, serving as a bridge that enables integration of layers with different chemistries
3Manufacturing precision
If the resist layer is made thinner to meet imaging requirements, then image quality is improved, but sufficient resistance to etching processes is lost
Solution Approach 1:
The patent segments the resist system into multiple functional layers: a thin imaging resist layer for high-quality pattern formation, and a separate intermediate silane-based layer for providing etching resistance. This segmentation allows each layer to be optimized for its specific function - the thin resist layer achieves excellent image quality while the intermediate layer provides the necessary etching protection
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 enhances the accuracy of pattern dimensions by minimizing light reflection, improving adhesion, and maintaining stability and etch selectivity, thereby addressing the limitations of conventional tri-layer resist methods in photolithography.
Implementation Method 1
absorbs uniformly in the ultraviolet spectral region
Data Source
AI summary
Compositions for use in tri-layer applications are described herein, wherein the composition has a matrix and includes: a formulated polymer comprising at least one type of silicon-based moiety forming the matrix of the polymer, a plurality of vinyl groups coupled to the matrix of the polymer, and a plurality of phenyl groups coupled to the matrix of the polymer, at least one condensation catalyst, and at least one solvent. Tri-layer structures are also contemplated herein that comprise an organic underlayer (first layer), antireflective compositions and/or films contemplated herein (second layer) and a photoresist material (third layer) that are coupled to one another. Methods of producing a composition for tri-layer patterning applications includes: providing a formulated polymer comprising at least one type of silicon-based moiety forming the matrix of the polymer, a plurality of vinyl groups coupled to the matrix of the polymer, and a plurality of phenyl groups coupled to the matrix of the polymer, providing at least one condensation catalyst, providing at least one solvent, providing at least one pH modifier, blending the formulated polymer and part of the at least one solvent in a reaction vessel to form a reactive mixture; and incorporating the at least one pH modifier, the at least one condensation catalyst and the remaining at least one solvent into the reactive mixture to form the composition.