Crossed Line-and-Space Patterning for High-Density IC Fabrication
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Solution Overview
Problem
Current integrated circuit fabrication methods struggle to achieve high packing density in forming repeating patterns, limiting the level of integration in components like DRAM and processors.
Innovation Solution
A method involving first and second line-and-space patterns is used to create high-density repeating patterns in a masking material, where openings are formed at intersections of both lines and spaces, allowing for the transfer of these patterns into a target material to fabricate highly-integrated components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional single pattern formation method is used, then manufacturing process is simple, but packing density is limited
Solution Approach 1:
The pattern formation process is segmented into multiple sequential steps: forming first lines, forming first spacers, forming second lines, and forming second spacers. Each step creates a portion of the final pattern, allowing complex high-density patterns to be built incrementally rather than attempting to create the entire pattern in a single step.
Solution Approach 2:
The invention transitions from planar 2D patterning to 3D vertical patterning by forming spacer structures that extend vertically from the substrate. This adds a vertical dimension to the pattern formation process, enabling higher packing density by utilizing the third dimension for component placement and spacing.
2Manufacturing precision
If pattern density is increased, then integration level improves, but manufacturing precision requirements increase
Solution Approach 1:
The spacer structures are formed through self-aligned processes where the spacer material automatically positions itself relative to the line structures. This self-alignment mechanism inherently ensures precise spacing and positioning without requiring additional alignment steps or external positioning mechanisms, thereby achieving high manufacturing precision.
Solution Approach 2:
The line structures are formed first as templates before the spacer structures are created. This preliminary action establishes the precise positions and dimensions of the final pattern elements before the actual spacing and positioning operations occur, ensuring that high precision requirements are met through pre-planned structural arrangements.
Data Source
AI summary
Some embodiments include a method of patterning a target material. An assembly is provided which has a masking material over the target material. First lines are formed over the assembly. The first lines extend along a first direction and are laterally spaced from one another by first spaces. Second lines are formed over the first lines. The second lines extend along a second direction which crosses the first direction, and are laterally spaced from one another by second spaces. The second lines cross the first lines at first crossing regions. The second spaces cross the first spaces at second crossing regions. A pattern includes the first and second crossing regions. The pattern is transferred into the masking material to form holes in the masking material in locations directly under the first and second crossing regions. The holes are extended into the target material.