Organic Layer Composition for Hardmask Etch Resistance
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Solution Overview
Problem
Current patterning processes in electronic device manufacturing face challenges in achieving fine pattern transfer and etch resistance using traditional hardmask layers, particularly in maintaining layer density and planarization during the miniaturization of devices.
Innovation Solution
An organic layer composition incorporating a polymer with a substituted or unsubstituted fluorene structure and a specific additive, along with a solvent, is used to form a hardmask layer that enhances etch resistance and gap-fill characteristics, allowing for improved pattern transfer and planarization through heat treatment and spin-on coating methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional hardmask layers are used for pattern transfer, then the process is simple, but etch resistance and fine pattern transfer capability are insufficient
Solution Approach 1:
The patent employs a composite organic layer structure consisting of a lower hardmask layer and an upper hardmask layer with different material compositions and properties. The lower hardmask layer provides foundational etch resistance, while the upper hardmask layer enhances fine pattern transfer capability. This composite structure resolves the contradiction by combining multiple materials to achieve superior overall performance compared to traditional single-layer hardmask systems.
2Productivity
If device miniaturization is pursued, then integration density increases, but maintaining layer density and planarization becomes difficult
Solution Approach 1:
The patent utilizes parameter changes by adjusting the molecular weight, composition, and thickness of different hardmask layers to optimize both integration density and layer planarization. The lower hardmask layer has different material parameters than the upper layer, allowing tailored optimization for each functional requirement. This enables maintaining manufacturing precision despite device miniaturization and increased integration density.
3Reliability
If hardmask layer thickness is increased for better etch resistance, then etch durability improves, but pattern fineness and resolution deteriorate
Solution Approach 1:
The patent segments the hardmask layer into multiple distinct layers with different thicknesses and material compositions. The lower hardmask layer provides the necessary etch durability with optimized thickness, while the upper hardmask layer maintains pattern fineness and resolution. This segmentation allows each layer to be independently optimized for its specific function, resolving the contradiction between etch durability and pattern resolution.
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 organic layer composition achieves excellent etch resistance and planarization, enabling effective pattern formation and multi-etching process durability, while also optimizing carbon content and solubility for improved initial planarity and thickness control.
Implementation Method 1
heat-treating the organic layer composition to form a hardmask layer
Implementation Method 2
applying the organic layer composition may include performing a spin-on coating method
Data Source
AI summary
An organic layer composition, an organic layer, and a method of forming patterns, the composition including a polymer that includes a substituted or unsubstituted fluorene structure, an additive represented by Chemical Formula 1, and a solvent: