Aromatic Polymer Underlayer for Lithography Reflectivity Control
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Solution Overview
Problem
Current lithographic techniques face challenges in reducing the size of microelectronic devices and forming microscopic structures due to limitations in effective patterning and reflectivity issues during the manufacturing process.
Innovation Solution
An aromatic ring-containing polymer is used in an anti-reflective underlayer composition, combined with an organic solvent, to create a self-curing film that facilitates pattern formation without a cross-linking agent, providing high absorption at short wavelengths and enabling efficient etching and pattern transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If conventional lithographic techniques are used for reducing the size of microelectronic devices, then device miniaturization is achieved, but reflectivity issues and patterning limitations occur
Solution Approach 1:
An aromatic ring-containing polymer underlayer is introduced as an intermediary between the substrate and the photoresist layer. This underlayer has specific optical properties (high absorption at short wavelengths) that prevent reflectivity issues during lithographic patterning, enabling effective miniaturization without the harmful reflectivity effects of conventional approaches.
2Reliability
If a cross-linking agent is used to form the underlayer, then film formation is achieved, but the process complexity increases
Solution Approach 1:
The aromatic ring-containing polymer underlayer is designed to self-cure or self-form the protective film without requiring a separate cross-linking agent. The polymer's molecular structure enables it to form a stable, chemically resistant film through self-organization or self-crosslinking mechanisms, eliminating the need for additional cross-linking chemistry and simplifying the overall process.
3Manufacturing precision
If the underlayer has high chemical resistance, then etching selectivity is improved, but optical properties may be compromised
Solution Approach 1:
The aromatic ring-containing polymer is designed with specific molecular parameters that simultaneously achieve high chemical resistance and optimal optical absorption. The aromatic rings provide both chemical stability for etching selectivity and strong absorption at lithographic wavelengths (193 nm, 248 nm). The polymer's weight average molecular weight is controlled at 1,000 to 50,000 to balance film-forming ability, chemical resistance, and optical properties.
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 allows for the formation of a hardmask layer with improved chemical resistance and optical properties, enabling precise patterning and reduced reflectivity, thereby enhancing the resolution and selectivity in microelectronic device fabrication.
Implementation Method 1
The aromatic ring-containing polymer may have high absorption at a short wavelength region
Data Source
AI summary
An aromatic ring-containing polymer, an underlayer composition including the same, and associated methods, the aromatic ring-containing polymer including a group represented by one of the following Chemical Formulae 1-1, 1-2, 2-1, and 2-2: