Block Copolymer Nanoscale Patterning via Brush Polymer Interface
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Solution Overview
Problem
Conventional block copolymers, such as PS-b-PDMS, face challenges in orientation control and long-range ordering during self-assembly, particularly for features smaller than 50 nanometers, due to thermal incompatibility and etch selectivity issues, limiting their effectiveness in nanoscale patterning and semiconductor fabrication.
Innovation Solution
A composition comprising a block copolymer with a minority block of low silicon content and a matrix block of high silicon content, combined with a brush polymer that is chemically distinct and reactive, allowing for improved annealing and etch resistance, enabling the formation of self-assembled films with domain sizes less than 25 nanometers and periodicity less than 50 nanometers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional block copolymers (PS-b-PDMS) are used for nanoscale patterning, then self-assembly can occur, but orientation control and long-range ordering are poor due to thermal incompatibility
Solution Approach 1:
The patent changes the chemical composition parameters of the block copolymer by replacing polystyrene with poly(tert-butyl styrene) and adjusting the polysiloxane content to specific ranges (1-20 mol%). These parameter changes modify the thermal properties and compatibility of the blocks, enabling better orientation control and long-range ordering during self-assembly while maintaining the desired nanoscale periodicity.
Solution Approach 2:
The patent creates a composite block copolymer system combining poly(tert-butyl styrene) and polysiloxane blocks with specific compositional ratios. This composite material approach allows optimization of both blocks' properties - the poly(tert-butyl styrene) provides structural integrity and orientation control, while the polysiloxane content is tuned to achieve thermal compatibility and desired self-assembly behavior.
2Manufacturing precision
If conventional block copolymers are used, then patterning can proceed, but etch selectivity is insufficient leading to poor pattern transfer
Solution Approach 1:
The patent modifies the chemical composition parameters to enhance etch selectivity. By using poly(tert-butyl styrene) instead of polystyrene and controlling polysiloxane content within specific ranges, the material exhibits differential etching behavior that improves pattern transfer fidelity. The specific compositional parameters create sufficient contrast in etch resistance between blocks for effective pattern transfer.
3Length of moving object
If block copolymer domain size is reduced to achieve smaller features, then nanoscale patterning capability improves, but self-assembly quality and long-range order deteriorate
Solution Approach 1:
The patent optimizes compositional parameters (block length ratios, polysiloxane content between 1-20 mol%) to maintain balanced interfacial interactions. This parameter optimization ensures that even at reduced domain sizes corresponding to sub-50nm periodicity, the blocks maintain sufficient compatibility and interaction strength to achieve high-quality self-assembly with excellent long-range order and minimal defects.
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 enables the formation of high-quality nanoscale patterns with improved long-range order and etch resistance, facilitating the production of semiconductors and electronic devices with precise feature sizes and reduced defectivity.
Implementation Method 1
a brush polymer; where the brush polymer comprises a reactive moiety that is reacted to a substrate upon which it is disposed
Implementation Method 2
The block copolymer is desirably annealed with heat (in the presence of an optional solvent), which allows for microphase separation of the polymer blocks A and B at a temperature above the glass transition temperature and below the order to disorder transition temperature
Implementation Method 3
Block copolymers form self-assembled nanostructures in order to reduce the free energy of the system
Implementation Method 4
The block copolymer is desirably annealed with heat (in the presence of an optional solvent), which allows for microphase separation of the polymer blocks A and B at a temperature above the glass transition temperature and below the order to disorder transition temperature
Data Source
AI summary
Disclosed herein is a composition comprising a brush polymer; where the brush polymer comprises a reactive moiety that is reacted to a substrate upon which it is disposed; and a block copolymer; where the block copolymer comprises a first block and a second block that are covalently bonded to each other; where the first block comprises a first polymer and a second block comprises a second polymer; where the first polymer comprises less than or equal to 10 atomic percent polysiloxane; where the second polymer comprises at least 15 atomic percent polysiloxane; where the brush polymer is chemically different from the first polymer and the second polymer; and where the first polymer is chemically different from the second polymer; and wherein the block copolymer is disposed upon the brush polymer.