Block Copolymer Self-Assembly for Bit-Patterned Media Templates
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Solution Overview
Problem
Current methods for fabricating bit-patterned media (BPM) templates face challenges in achieving high bit density and uniformity, particularly in integrating servo and data zones without alignment marks, and in maintaining long-range order in block copolymer self-assembly patterns.
Innovation Solution
The method combines e-beam lithography for patterning servo zones and block copolymer self-assembly for data zones, using differently dosed electron beams and developers to create templates with high bit density, and incorporates chemical affinity layers and self-alignment processes to enhance pattern resolution and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If block copolymer self-assembly is used to pattern BPM templates, then throughput is improved, but manufacturing precision deteriorates due to grain boundary defects
Solution Approach 1:
The patent introduces alignment marks as intermediary features that mediate between the block copolymer self-assembly process and the final pattern uniformity. These alignment marks serve as reference points that guide the self-assembly process, allowing the system to achieve both high throughput and manufacturing precision by providing a framework that reduces grain boundary defects while maintaining the benefits of self-assembly
Solution Approach 2:
The patent applies parameter changes by modifying the block copolymer composition, molecular weight, and self-assembly conditions to optimize both throughput and pattern uniformity. By adjusting these parameters, the system achieves improved manufacturing precision without sacrificing the high productivity benefits of self-assembly
2Manufacturing precision
If alignment marks are used to pattern servo and data zones, then manufacturing precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the alignment mark formation with the block copolymer self-assembly process, combining two separate operations into a unified approach. This integration reduces device complexity by eliminating the need for separate alignment mark fabrication steps while maintaining the manufacturing precision benefits of using alignment marks
3Quantity of substance
If high bit density patterns are formed, then storage capacity is improved, but manufacturing precision deteriorates due to pattern uniformity challenges
Solution Approach 1:
The patent employs self-service mechanisms where the block copolymer system automatically corrects pattern uniformity issues through its self-assembly process. The system uses inherent self-correction capabilities to maintain pattern uniformity even at high bit densities, achieving both high storage capacity and manufacturing precision without requiring extensive external intervention
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
This approach enables the creation of BPM templates with bit densities greater than 1 Tdpsi, improved pattern resolution, and high dry etching resistance, addressing issues of grain boundary defects and domain size uniformity, while eliminating the need for alignment marks.
Implementation Method 1
conducting block-copolymer self-assembly to form a second pattern on the substrate
Implementation Method 2
conducting lithography to form a first pattern on a substrate
Data Source
AI summary
Patterned substrates templates are provided, as well as methods comprising a combination of lithography and self-assembly techniques. The patterned substrates may comprise first and second patterns.