Brush Layer Mask Uniformity in IC Fabrication
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Solution Overview
Problem
Integrated circuit fabrication faces challenges in creating uniform, dense patterns of features within masks, which affects the density and efficiency of integrated circuitry.
Innovation Solution
The use of a brush layer formed by covalent bonding of polymeric organic materials, such as siloxane or other organic polymers, to surfaces to improve uniformity across patterned features, where the brush layer narrows and smooths differences between feature shapes, optimizing surface tension and minimizing free energy to achieve a higher level of uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mask formation methods are used, then manufacturing process is simple, but manufacturing precision of patterned features deteriorates
Solution Approach 1:
A brush layer is formed on the mask surface before pattern transfer to pre-condition the surface and improve feature uniformity. This preliminary action modifies the mask surface properties to achieve better manufacturing precision without adding complex subsequent processing steps.
Solution Approach 2:
The brush layer acts as an intermediary between the mask and the pattern transfer process. It mediates the interaction by providing a controlled surface that improves the uniformity of patterned features while maintaining compatibility with existing mask formation methods.
2Productivity
If feature density in masks is increased, then productivity of integrated circuit fabrication is improved, but manufacturing precision of uniform patterns deteriorates
Solution Approach 1:
The brush layer is formed in advance on high-density mask patterns to pre-establish uniform surface conditions. This allows high feature density to be achieved while maintaining uniformity through the preparatory surface modification that the brush layer provides.
Solution Approach 2:
The brush layer changes the surface parameters of the mask, such as surface energy and wetting properties, which enables high-density patterns to be formed with improved uniformity. The parameter changes in the mask surface properties facilitate better pattern transfer at high densities.
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 brush layer enhances the uniformity of patterned features, leading to improved pattern transfer and increased density of integrated circuitry, addressing the limitations of existing methods in achieving uniform and dense patterns.
Implementation Method 1
optimizing surface tension and minimizing free energy to achieve a higher level of uniformity
Implementation Method 2
optimizing surface tension and minimizing free energy to achieve a higher level of uniformity
Data Source
AI summary
Some embodiments include methods of forming patterns. A first mask is formed over a material. The first mask has features extending therein and defines a first pattern. The first pattern has a first level of uniformity across a distribution of the features. A brush layer is formed across the first mask and within the features to narrow the features and create a second mask from the first mask. The second mask has a second level of uniformity across the narrowed features which is greater than the first level of uniformity. A pattern is transferred from the second mask into the material.