Block Copolymer Layer Thickness Control for Cylinder Alignment
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Solution Overview
Problem
Existing methods for forming phase-separated structures using block copolymers face challenges in improving misalignment of cylinder structures, line roughness, and alignment mark formation during the fabrication of integrated circuits.
Innovation Solution
The method involves setting the thickness of the layer containing the block copolymer such that the relationship between the thickness and the period of the block copolymer satisfies specific formulas, allowing for improved alignment and reduced line roughness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the block copolymer layer is not controlled according to a specific relationship with the period, then the alignment of cylinder structures deteriorates, but controlling the thickness precisely increases process complexity
Solution Approach 1:
The invention changes the critical parameter of layer thickness to a specific range (0.5L0 to 2.0L0 where L0 is the period of the block copolymer) to achieve proper alignment of cylinder structures. This parameter optimization resolves the alignment issue without requiring complex process modifications.
Solution Approach 2:
The invention performs preliminary control of the block copolymer layer thickness before the phase separation process. By pre-establishing the correct thickness relationship with the period L0, the subsequent self-assembly process naturally produces properly aligned cylinder structures, avoiding the need for complex post-processing alignment corrections.
2Manufacturing precision
If the thickness of the block copolymer layer is not optimized, then line roughness increases, but optimizing the thickness requires precise control that complicates manufacturing
Solution Approach 1:
The invention optimizes the layer thickness parameter to a specific range (0.5L0 to 2.0L0) to minimize line roughness. This parameter change improves manufacturing precision while the range-based specification keeps the manufacturing process manageable rather than requiring ultra-precise control.
Solution Approach 2:
By setting the layer thickness within the specified range, the block copolymer system performs self-service through directed self-assembly, naturally forming smooth lines with reduced roughness without requiring additional manufacturing interventions or complex process steps.
3Manufacturing precision
If the layer thickness does not satisfy the specific formula relationship with the period, then alignment mark formation deteriorates, but implementing precise thickness control increases process steps
Solution Approach 1:
The invention changes the layer thickness parameter to satisfy the specific formula relationship (0.5L0 to 2.0L0) to achieve proper alignment mark formation. This single parameter optimization improves manufacturing precision without requiring additional process steps, thereby maintaining productivity.
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 effectively improves the alignment of cylinder structures and reduces line roughness, enabling better formation of alignment marks, which is crucial for precise device fabrication.
Implementation Method 1
The block copolymers separate (phase-separate) into micro-regions due to repulsion between the mutually incompatible blocks
Implementation Method 2
separate (phase-separate) into micro-regions due to repulsion between the mutually incompatible blocks
Implementation Method 3
forming a layer including a block copolymer and having a thickness t (nm) on a substrate using a resin composition containing the block copolymer
Data Source
AI summary
A method for producing a structure having a phase-separated structure that can improve misalignment of a cylinder structure or line roughness and form alignment marks well. The method includes forming a layer including a block copolymer and having a thickness t on a substrate using a resin composition containing the block copolymer, and separating the layer into a cylinder structure. The thickness t is set such that a relationship between the thickness t and a period L0 of the block copolymer satisfies a specific formula.