Laminate for Block Copolymer Vertical Orientation
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Solution Overview
Problem
Current methods for producing patterned substrates using block copolymers face challenges in achieving precise self-assembly and high aspect ratios, particularly in orienting the self-assembled structures vertically on substrates with varying polarities.
Innovation Solution
A laminate structure comprising a random copolymer film and a block copolymer film is formed on a substrate, where the random copolymer film covers the bottom and sidewalls of trenches, and the block copolymer film is formed on top, allowing for precise control of the self-assembled structure and vertical orientation through the use of mesa structures on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If block copolymer is used for self-assembly on substrates, then nanowire production and nano device fabrication are enabled, but achieving vertical orientation and high aspect ratio is difficult due to substrate polarity and wetting issues
Solution Approach 1:
The patent divides the copolymer into distinct blocks with different polarities (first block with higher polarity, second block with lower polarity). This segmentation allows each block to interact differently with substrates of varying polarities, enabling vertical orientation control. The segmented structure resolves the contradiction by providing specific interaction mechanisms for different substrate types.
Solution Approach 2:
The patent applies local quality by having different blocks of the copolymer exhibit different wetting characteristics on different parts of the substrate. The first block preferentially wets polar substrates while the second block wets non-polar substrates, creating localized interactions that collectively achieve vertical orientation and high aspect ratio structures.
2Manufacturing precision
If block copolymer forms self-assembled structures, then nanoscale patterns are produced, but orientation defects occur due to competing wetting interactions between blocks
Solution Approach 1:
The patent changes the polarity parameter of the copolymer blocks to resolve orientation defects. By carefully selecting blocks with specific polarity differences, the system achieves consistent vertical orientation across different substrate types. This parameter adjustment eliminates the competing wetting interactions that cause orientation defects while maintaining nanoscale pattern formation accuracy.
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 formation of highly aligned block copolymer self-assembled structures without orientation defects, effectively guiding the self-assembly process and enhancing the aspect ratio of the patterned substrate, suitable for various electronic and electric applications.
Implementation Method 1
a block having a larger polarity among the blocks of the block copolymer is wetted to the substrate, and a block having a smaller polarity is wetted at the interface with air
Data Source
AI summary
The present application relates to a block copolymer and a use thereof. The present application can provide a laminate which is capable of forming a highly aligned block copolymer on a substrate and thus can be effectively applied to production of various patterned substrates, and a method for producing a patterned substrate using the same.