Block Copolymer Self-Assembly for Semiconductor Patterning
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for increasing integrated circuit density, such as photolithography, face limitations in achieving smaller feature sizes, and while block copolymers show promise, they require new methods to form high-density patterns suitable for semiconductor fabrication.
Innovation Solution
A process involving a substrate with a material patterned into a first masking pattern, followed by treatment to form repeating segments and selective removal to create a second masking pattern, utilizing block copolymers that self-assemble to achieve features with pitches smaller than those achievable by photolithography alone, enhancing circuit density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolithography is utilized to pattern integrated circuit components, then manufacturing process is well-established and reliable, but minimum feature size cannot be reduced beyond a threshold dictated by the wavelength utilized during photolithography
Solution Approach 1:
The patent segments the patterning process into two distinct stages: first, photolithography creates a master pattern with larger features; second, block copolymer self-assembly creates a refined high-density pattern within those features. This segmentation allows each process to operate at its optimal scale, with photolithography handling the initial structure definition and block copolymers providing the final high-precision patterning.
Solution Approach 2:
The patent implements a nested patterning approach where block copolymer patterns are formed within the confines of photolithographically-defined features. The block copolymer structures nest inside the larger photolithography patterns, creating a hierarchical structure that combines the advantages of both patterning methods to achieve densities beyond what either method could achieve alone.
2Manufacturing precision
If block copolymers are utilized to form high-density patterns, then integrated circuit density can be increased beyond photolithography limits, but new methods must be developed and technical obstacles must be overcome
Solution Approach 1:
The patent leverages the self-assembling properties of block copolymers, which automatically organize into ordered patterns when subjected to appropriate stimuli such as temperature changes or solvent exposure. This self-service mechanism eliminates the need for complex external patterning equipment and processes, allowing the material itself to generate the high-density patterns required for increased circuit density.
Solution Approach 2:
The patent utilizes changes in physical parameters such as temperature, solvent concentration, and annealing conditions to control the self-assembly behavior of block copolymers. By adjusting these parameters, the process optimizes pattern formation and can be adapted to different desired pattern geometries and densities, making the manufacturing process more controllable and easier to implement.
3Manufacturing precision
If the material is treated to form repeating segments and selectively removed, then a second masking pattern superimposed within the first masking pattern is formed, but additional process steps are required
Solution Approach 1:
The patent performs preliminary photolithographic patterning to create the first masking pattern that defines the overall feature locations and dimensions. This preliminary action establishes the framework within which the block copolymer will subsequently self-assemble, ensuring that the final high-density pattern is correctly positioned and scaled relative to the device architecture.
Solution Approach 2:
The block copolymer treatment process utilizes periodic action through controlled annealing cycles and solvent exposure sequences. These periodic treatments allow the block copolymer chains to repeatedly fold, assemble, and reorganize into the desired repeating segment patterns, ensuring high precision in the final masking pattern while maintaining reasonable process throughput through optimized cycle times.
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 allows for the formation of high-density patterns within semiconductor structures, overcoming limitations of photolithography and enabling increased integrated circuit density through the use of block copolymers in semiconductor device fabrication.
Implementation Method 1
utilizing block copolymers that self-assemble to achieve features with pitches smaller than those achievable by photolithography alone
Implementation Method 2
the material is treated to form repeating segments within the material, and then one or more of the segments is selectively removed to form a second masking pattern
Data Source
AI summary
Some embodiments include methods of forming patterns in which a block copolymer-containing composition is formed over a substrate, and is then patterned to form a first mask. The block copolymer of the composition is subsequently induced into forming a repeating pattern within the first mask. Portions of the repeating pattern are then removed to form a second mask from the first mask. The patterning of the block copolymer-containing composition may utilize photolithography. Alternatively, the substrate may have regions which wet differently relative to one another with respect to the block copolymer-containing composition, and the patterning of the first mask may utilize such differences in wetting in forming the first mask.