Block Copolymer Stamp Nanopatterning via Self-Assembly

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Solution Overview

Problem

Conventional lithography techniques face limitations in producing sub-lithographic features due to inconsistent printing caused by capillary forces and high costs associated with advanced lithographic tools like EUV lithography and e-beam lithography.

Innovation Solution

A method using self-assembling block copolymers to create a stamp with nanometer-scale patterns, where block copolymer films spontaneously assemble into periodic structures, allowing for the transfer of ink to a substrate to form self-assembled monolayers with improved resolution and reduced processing costs.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If conventional photolithography is used, then manufacturing process is simple and cost-effective, but minimum feature size is limited to about 60 nm due to wavelength constraints

Engineering Contradiction:

Improveminimum feature sizeVSAvoidlithography system complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent segments the lithography process into two stages: first using conventional photolithography to create larger features (e.g., 60 nm) that serve as templates, then using self-assembling block copolymers to further subdivide these features into smaller patterns (e.g., 20 nm). This segmentation allows achieving sub-lithographic features without directly using complex advanced lithography tools.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces self-assembling block copolymers as an intermediary material between the lithographically formed template and the final nanoscale pattern. The block copolymers self-assemble into periodic structures with dimensions smaller than the lithographic features, acting as a mediator to transfer and refine the pattern at the nanoscale level.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Manufacturing precision

If EUV lithography or e-beam lithography is used to form sub-lithographic features, then manufacturing precision improves, but processing costs increase significantly

Engineering Contradiction:

Improvefeature size precisionVSAvoidprocessing cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent uses conventional photolithography to create a master template that is then copied and refined through self-assembling block copolymers. Instead of directly using expensive EUV or e-beam lithography to create each nanoscale feature, the system creates one set of features using conventional methods and uses self-assembly to multiply and refine the pattern, significantly reducing processing costs.

Inventive Principle:

Principle #26Copying

Solution Approach 2:

The patent employs self-assembling block copolymers that automatically organize into periodic nanoscale structures without requiring complex lithography tools. The block copolymers perform the patterning function themselves through spontaneous self-assembly driven by phase separation, eliminating the need for expensive equipment and reducing processing costs.

Inventive Principle:

Principle #25Self-service

3Manufacturing precision

If microcontact printing with soft templates is used, then sub-lithographic features can be created, but capillary forces cause inconsistent printing and alter feature dimensions

Engineering Contradiction:

Improvefeature dimension controlVSAvoidprinting consistency

Core Design Contradiction:

Manufacturing precisionVSReliability

Solution Approach 1:

The patent changes the physical and chemical parameters of the stamping surface by using self-assembled monolayers with controlled wettability and surface energy. This modification of surface parameters reduces capillary forces and improves ink transfer consistency, thereby enhancing printing reliability and feature dimension control.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent utilizes the phase transition properties of self-assembling monolayers during the stamping process. The ink material undergoes phase transition from liquid to self-assembled monolayer structure on the stamping surface, and then transfers to the substrate. This controlled phase transition ensures consistent ink deposition and reduces dimensional alterations.

Inventive Principle:

Principle #36Phase transitions

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 method achieves higher resolution and lower costs compared to traditional techniques, enabling the production of sub-lithographic features with precise nanoscale patterns on substrates.

Implementation Method 1

Self-assembling block copolymers to create a stamp with nanometer-scale patterns, where block copolymer films spontaneously assemble into periodic structures

Methodology Applied

Scientific EffectSelf-assembly: Self-Assembly