Primer Layer for Block Copolymer Lithography Defect Reduction
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Solution Overview
Problem
Self-assembled block copolymer layers in lithography often exhibit high defect rates and limited pattern persistence length due to interfacial energies and chemical affinities, which hinder their use in high-resolution device manufacturing.
Innovation Solution
A method involving a primer layer with specific chemical affinities for domain types in block copolymers is used to enhance self-assembly by adjusting interfacial concentrations during annealing, reducing defects and improving pattern persistence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If self-assembled block copolymer layers are used for lithography patterning, then resolution is improved, but defect density increases
Solution Approach 1:
A primer layer is introduced as an intermediary between the substrate and the self-assembled block copolymer layer. This primer layer mediates the interaction by providing tailored interfacial energy and chemical affinity that promotes defect-free self-assembly while preserving the high resolution patterning capability of the block copolymer system
Solution Approach 2:
The interfacial energy parameters at the substrate-polymer interface are modified by selecting primer layer materials with specific surface energies and chemical compositions. This parameter change optimizes the nucleation and growth of block copolymer domains, reducing defects while maintaining resolution
2Length of moving object
If self-assembled block copolymer layers are used for lithography patterning, then pattern persistence length is improved, but defect density increases
Solution Approach 1:
The primer layer acts as a mediator that provides uniform interfacial conditions across the substrate surface, enabling long-range order and extended pattern persistence length while simultaneously reducing the nucleation of defects during the self-assembly process
3Reliability
If primer layer with specific chemical affinities is used to enhance self-assembly, then defect density is reduced, but process complexity increases
Solution Approach 1:
The primer layer is deposited in advance before the block copolymer self-assembly process. This preliminary action prepares the substrate surface with optimal chemical and physical properties, ensuring defect-free assembly occurs during the subsequent self-assembly step without requiring complex in-situ control mechanisms
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 significantly reduces defect densities and enhances pattern persistence length, enabling the formation of high-quality self-assembled layers suitable for advanced lithography applications.
Implementation Method 1
Self-assemblable block copolymers are materials useful in nanofabrication because they may undergo an order-disorder transition on cooling below a certain temperature (order-disorder transition temperature To/d) resulting in phase separation of copolymer blocks of different chemical nature to form ordered, chemically distinct domains
Implementation Method 2
phase separation of copolymer blocks of different chemical nature to form ordered, chemically distinct domains
Implementation Method 3
treating the self-assemblable polymer layer to provide self-assembly into an ordered polymer layer comprising first and second domain types at the interface
Implementation Method 4
the primer layer is adapted to improve its chemical affinity for the first domain type at first loci of the interface, in response to the presence of that first domain type
Data Source
AI summary
A method for providing an ordered polymer layer at a surface of a substrate includes depositing a self-assemblable polymer layer directly onto a primer layer on a substrate to provide an interface between the self-assemblable polymer layer and the primer layer, and treating the self-assemblable polymer layer to provide self-assembly into an ordered polymer layer, such as a block copolymer, having first and second domain types at the interface. The primer layer is adapted to improve its chemical affinity to each domain type at the interface, in response to the presence of the respective domain type in the self-assembled polymer at the interface during the self-assembly of the self-assemblable polymer layer into the ordered polymer layer. This may lead to reduction in defect levels and/or improved persistence length for the ordered polymer layer. The method may be useful for forming resist layers for use in device lithography.