Indole-Based Hardmask Polymer for Lithography
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Solution Overview
Problem
Current lithographic techniques face challenges in forming fine patterns with excellent profiles, particularly in the semiconductor industry, where ultra-fine techniques require materials with high heat and etch resistance to prevent damage during high-temperature processes and etching.
Innovation Solution
A polymer is developed by reacting a substituted or unsubstituted indole compound with specific aromatic aldehyde compounds, forming a hardmask composition that includes a solvent, which is applied and heat-treated to create a hardmask layer, allowing for the formation of a photoresist pattern and selective etching of a material layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photoresist materials are used for ultra-fine lithography, then pattern formation is achieved, but heat resistance and etch resistance are insufficient causing damage during high-temperature processes and etching
Solution Approach 1:
The patent uses a composite material system consisting of a polymer main chain with indole units providing heat resistance, and aromatic aldehyde side chains providing etch resistance. This composite structure allows simultaneous achievement of high heat resistance (maintaining integrity at lithography temperatures) and high etch resistance (resisting removal during etching processes), resolving the contradiction between reliability and ease of manufacture
Solution Approach 2:
The patent modifies the chemical parameters of the photoresist material by incorporating specific indole compounds with electron-donating groups and aromatic aldehydes with branched alkyl groups. These parameter changes in molecular structure directly enhance both heat resistance and etch resistance properties, allowing the material to withstand high-temperature processing and aggressive etching conditions without damage
2Manufacturing precision
If photoresist layers are used as masks for etching, then material layer etching is enabled, but pattern profile precision deteriorates due to material damage
Solution Approach 1:
The patent employs a disposable hardmask layer made from the specialized polymer that is intentionally designed to be removed after serving its protective function. This hardmask layer absorbs the damage from high-temperature processes and etching, protecting the underlying material layer and maintaining pattern profile precision, while the hardmask itself is sacrificed in the process
Solution Approach 2:
The patent introduces a hardmask layer as an intermediary between the photoresist and the material layer. This intermediate layer bears the brunt of thermal and chemical stress during processing, preventing direct damage to the photoresist and material layer interface, thereby preserving pattern profile precision throughout the manufacturing process
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 polymer provides high solubility, heat resistance, and etch resistance, enabling the formation of fine patterns with reduced damage during high-temperature processes and improved etching resistance compared to existing materials.
Implementation Method 1
the polymer provides high solubility, heat resistance, and etch resistance
Implementation Method 2
heat resistance, enabling the formation of fine patterns with reduced damage during high-temperature processes
Implementation Method 3
etch resistance, enabling the formation of fine patterns with reduced damage during high-temperature processes and improved etching resistance
Data Source
AI summary
A polymer, a hardmask composition, and a method of forming patterns, the polymer including structural units obtained by a reaction of a reaction mixture that includes a substituted or unsubstituted indole compound, a first aromatic aldehyde compound including a substituted or unsubstituted C3 to C20 branched alkyl group thereon, and a second aromatic aldehyde compound that is different from the first aromatic aldehyde compound.