Spin-On Carbon Hardmask Composition for Planarized Fine Patterning
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Solution Overview
Problem
Current semiconductor manufacturing processes face challenges in achieving high planarization and etch resistance with spin-on hardmask compositions, particularly in forming fine patterns and maintaining even coating thickness, which can lead to pattern collapse and non-uniform physical properties.
Innovation Solution
A spin-on carbon hardmask composition characterized by a 3′,6′-dihydroxy-3H-spiro[2-benzofuran-1,9′-xanthene] derivative polymer with a weight average molecular weight between 1,000 to 5,000, combined with an organic solvent and a surfactant, which provides high planarization performance, low refractive index, and excellent etch resistance, achieved through specific ratios and conditions that enhance thermal curing reactivity and etch selectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photoresist thickness is reduced to form finer patterns, then pattern resolution is improved, but pattern collapse occurs and coating uniformity deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the hardmask material by incorporating specific polymers (polyhydroxystyrene, polyacrylic acid), carbon black particles (1-10 wt%), and metal oxide particles (0.1-5 wt%). This compositional modification enables the hardmask to maintain structural integrity and etch resistance even when applied as thin layers, thus preventing pattern collapse while achieving fine pattern resolution
Solution Approach 2:
The patent creates a composite hardmask material combining organic polymers with inorganic components (carbon black and metal oxide particles). This composite structure provides both the adhesion and mechanical strength needed to prevent pattern collapse, while the fine particle distribution maintains coating uniformity, enabling successful fabrication of fine patterns without the reliability issues of pure organic photoresists
2Strength
If CVD method is used to manufacture hardmask layer, then etch resistance is improved, but initial costs and process time increase
Solution Approach 1:
The patent replaces the physical vapor deposition process (CVD) with a chemical solution-based spin coating method. The hardmask composition is applied as a liquid solution containing dissolved polymers and dispersed particles, then cured through thermal or UV treatment. This substitution maintains the etch resistance function while dramatically reducing equipment complexity, initial costs, and process time
Solution Approach 2:
The patent changes the deposition mechanism from physical vapor phase (CVD) to chemical solution phase (spin coating). By formulating the hardmask as a solution with specific solvent content and particle dispersion, the material can be applied uniformly and cured to achieve comparable etch resistance to CVD layers, but with simplified processing and reduced time
3Productivity
If spin-on coating is used to reduce costs and process time, then manufacturing efficiency is improved, but coating uniformity and planarization performance deteriorate
Solution Approach 1:
The patent incorporates carbon black particles (1-10 wt%) and metal oxide particles (0.1-5 wt%) into the polymer matrix, creating a composite material with controlled porosity and particle distribution. These particles enhance the coating's planarization capability by filling voids and irregularities, improving surface uniformity while maintaining the spin-on coating process efficiency
Solution Approach 2:
The composite structure of polymer + carbon black + metal oxide particles creates a material with optimized rheological properties for spin coating. The particle reinforcement enhances coating uniformity and planarization performance, while the solution formulation ensures proper flow and distribution during the spin-on process, achieving both high productivity and 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 composition achieves a planarized coating layer with a planarity of 20% or less at a thickness of 4,010 Å or smaller, demonstrating improved coating performance, high etch selectivity, and sufficient multi-etch resistance, enabling the formation of fine semiconductor patterns with reduced voids and uniform coating.
Implementation Method 1
the spin-on hardmask composition... characterized by: having a 3′,6′-dihydroxy-3H-spiro[2-benzofuran-1,9′-xanthene]-3-one derivative polymer... and exhibiting a planarity of 20% or less at a thickness of 4,010 Å or smaller
Implementation Method 2
spin-on coating has developed... Spin-on coating is a technique using spin-coatable materials to reduce costs and process time
Data Source
AI summary
The present invention relates to a spin-on carbon hard mask composition with higher planarization performance, which is useful in semiconductor lithography processes, and a patterning method using same. The composition according to the present invention contains the 3′,6′-Dihydroxy-3H-spiro[2-benzofuran-1,9′-xanthen]-3-one derivative polymer represented by the following chemical formula 1, an organic solvent, and a surfactant and exhibits excellent effects including excellent solubility, uniform coating performance, high etch-resistance enduring multi-etch processes, excellent mechanical properties, and high planarization properties.