Block Co-Polymer Self-Assembly for Nano-Scale Semiconductor Patterning
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Solution Overview
Problem
Current methods for forming fine patterns in semiconductor devices face limitations due to image resolution constraints of photolithography processes, and self-assembly techniques for overcoming these limitations are still under development, making it difficult to achieve high integration density.
Innovation Solution
A method involving the formation of an array of pillars with a block co-polymer (BCP) layer that is phase-separated into domains, creating separation walls and filling gaps between pillars to form fine patterns, allowing for the fabrication of semiconductor devices with nano-scaled features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography process is used to form fine patterns, then manufacturing process is well-established, but image resolution limits prevent formation of nano-scaled patterns
Solution Approach 1:
The patent divides the pattern formation process into multiple stages: first forming pillars at a relaxed pitch, then using self-assembled block copolymer domains to create secondary patterns at nano-scale. This segmentation allows each stage to operate at optimal resolution levels, overcoming the single-step photolithography resolution limit.
Solution Approach 2:
The patent introduces block copolymer layers as intermediary structures that mediate between the photolithography-formed pillars and the final fine patterns. The BCP self-assembles into domains that act as templates for the ultimate pattern, translating larger-scale photolithography features into nano-scale structures.
2Manufacturing precision
If self-assembly technique is used to form fine patterns, then photolithography resolution limits are overcome, but the technique is still under development and difficult to implement for highly integrated devices
Solution Approach 1:
The patent performs preliminary actions by first forming the pillar array using conventional photolithography before introducing the block copolymer self-assembly process. This preliminary structuring provides a template that guides the subsequent self-assembly, making the overall process more controllable and manufacturable.
Solution Approach 2:
The patent implements a nested structure where block copolymer domains are formed within and around the photolithography-defined pillars. The BCP domains are nested within the gaps between pillars and on top of pillars, creating hierarchical patterns that combine both fabrication approaches.
3Quantity of substance
If integration density is increased by forming more patterns in limited area, then device functionality is improved, but photolithography image resolution limits are exceeded
Solution Approach 1:
The patent transitions from two-dimensional photolithography patterning to three-dimensional pattern formation by utilizing vertical self-assembly of block copolymers. The BCP domains form in the vertical dimension above and between pillars, effectively adding a new dimension to pattern formation and achieving higher density without requiring smaller lateral features.
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 fine patterns with sizes similar to a single molecular layer, overcoming photolithography resolution limits and achieving uniform, regularly arrayed contact holes in memory devices and logic devices.
Implementation Method 1
phase-separating the BCP layer into first domains including second separation walls on the first separation walls and second domains separated from the pillars by the first domains
Data Source
AI summary
The method includes forming an array of first separation walls on an underlying layer. A block co-polymer (BCP) layer is formed to fill inside regions of the first separation walls and gaps between the first separation walls. The BCP layer is phase-separated to include first domains that provide second separation walls covering inner sidewalls and outer sidewalls of the first separation walls and second domains that are separated from each other by the first domains.