What is directed self-assembly?
What is directed self-assembly?
Directed self-assembly (DSA) is a type of directed assembly which utilizes block co-polymer morphology to create lines, space and hole patterns, facilitating for a more accurate control of the feature shapes. Directed self-assembly is mostly used in the semiconductor and hard drive industries.
What is DSA in semiconductor?
Description. DSA is a complementary lithography technology. When used in conjunction with a pre-pattern that automatically directs the orientation of block copolymers, DSA can reduce the pitch of the final printed structure. Using 193nm lithography, DSA has demonstrated the ability to pattern structures down to 12.5nm.
What is directed assembly?
Directed Assembly is an EPSRC-funded Grand Challenge network aiming to gain unprecedented control of the assembly of molecules that are the building blocks of many functional materials, consumer and industrial products.
How does self-assembly work?
Self-assembly is a process in which a disordered system of pre-existing components forms an organized structure or pattern as a consequence of specific, local interactions among the components themselves, without external direction.
What is self-assembly in nanotechnology?
Definition. Self-assembly of nanostructures is a process where atoms, molecules or nanoscale building blocks spontaneously organize into ordered structures or patterns with nanometer features without any human intervention. It is the most promising practical low-cost and high-throughput approach for nanofabrication.
What are some examples of self-assembly?
A few examples of static self-assembly phenomenon tailored by nature are lipid molecules forming oil droplets in water, four hemoglobin polypeptides forming a functional hemoglobin protein, and the combination of RNA and ribosomal proteins to form a functional ribosome.
What is supramolecular self-assembly?
Molecular self-assembly is a process in which molecules (or parts of molecules) spontaneously form ordered aggregates and involves no human intervention; the interactions involved usually are noncovalent. In molecular self-assembly, the molecular structure determines the structure of the assembly (1).
Is self-assembly reversible?
For higher surface concentrations, self-assembly is irreversible, and the NPs organize into permanently cross-linked structures including robust supracrystals and plastic spherical aggregates.
What are the two types of self-assembly?
There are two types of self-assembly, intramolecular self-assembly and intermolecular self-assembly. Most often the term molecular self-assembly refers to intermolecular self-assembly, while the intramolecular analog is more commonly called folding.
Is MOFs supramolecular?
Metal-organic frameworks (MOFs) are periodic porous architectures that are made by linking inorganic and organic units with strong bonds1,2,3,4,5,6,7,8. With this strategy, crystalline supramolecular and hydrogen-bonded organic frameworks have been constructed as porous materials for gas adsorption38,39.
What is the difference between zeolite and metal-organic framework?
Zeolites are natural or synthetic materials with porous chemical structures that are valuable due to their absorptive and catalytic qualities. Metal-Organic Frameworks (MOFs) are manmade organometallic polymers with similar porous structures.
Are MOFs better than zeolites?
MOFs offer higher surface areas than zeolites. Actually, to this date, metal-organic frameworks are the most porous materials known to have specific surface areas as high as 7,140 m2/g (structural changes of the same material predict a higher value of 10,000 m2/g).
How is directed self assembly used in lithography?
Directed self-assembly (DSA) emerges as one of the most promising new patterning techniques for single digit miniaturization and next generation lithography. DSA achieves high-resolution patterning by molecular assembly that circumvents the diffraction limit of conventional photolithography.
What’s the difference between DSA and traditional lithography?
DSA isn’t like a traditional lithography technology, though. It’s a complementary patterning approach that enables fine pitches using block copolymers. In DSA, a lithography system forms a pre-defined pattern on a structure. The structure is coated with block copolymers, which then self-assemble in tiny patterns,…
Why is directed self assembly ( DSA ) getting a serious look?
Why this technology is getting a serious look at 5/3nm and beyond, and who’s driving it. Directed self-assembly (DSA) is moving back onto the patterning radar screen amid ongoing challenges in lithography.
How is DSA re-enters the litho picture?
At the same time, the industry put more resources behind extreme ultraviolet ( EUV) lithography. Today, though, DSA is making noticeable progress with some intriguing possibilities entering the picture. In just one example, Leti, along with Arkema and Brewer Science, are jointly developing next-generation DSA materials.