Izit possible fabricate the quantum dot by cvd?

[takeshi_ccw]

izit possible if i take nanoporous alumina or nanoporous silicon into the cvd.
use the gallium powder n flow the ammonia gas...
can it make a gaN quantum dot?
any idea to fabricate quantum dot without mbe?
i think there sure has a simple and cheap way to make it...
any idea?
tanx

 

[Gokul43201]

III-V quantum dots have been made by MOCVD for at least over a decade now. The trick (I think it's called self-assembly) is to deposit a few monolayers over a (typically GaAs) substrate with a large lattice mismatch that puts the film in tensile strain. If you keep the number of monolayers down below a certain limit, the strain forces the film to break up into islands, and voila, you have your dots.

There's probably several more ways to do this that I'm not aware of.

Edit : In the above technique, the substrate is likely grown by MBE, so you'll have to "get" that from someone else. But I'll take a look to see if anyone has done this entirely on a MOCVD unit.

 

[charng]

Yes, it is possible to fabricate quantum dots using chemical vapor deposition (CVD). CVD is a commonly used method for producing thin films and nanostructures, including quantum dots. In this method, a precursor gas containing the desired material (such as gallium powder) is heated and allowed to react with a substrate (such as nanoporous alumina or silicon) in the presence of a carrier gas (such as ammonia). The resulting reaction forms a thin film or nanostructure on the substrate, which can then be further processed to form quantum dots.

Using gallium powder and ammonia gas in CVD can indeed result in the formation of gallium nitride (GaN) quantum dots. However, the size and properties of the quantum dots may vary depending on the specific conditions used in the CVD process.

There are also other methods for fabricating quantum dots, such as using molecular beam epitaxy (MBE). However, if MBE is not available, CVD can be a viable alternative for producing quantum dots. It is always important to carefully consider the specific materials and processes used in any fabrication method to ensure the desired properties and quality of the resulting quantum dots.

As for a simple and cheap way to make quantum dots, there is ongoing research and development in this area. Some potential methods being explored include using self-assembly techniques or using biological systems to produce quantum dots. However, these methods are still in the early stages of development and may not be as reliable or controllable as more established methods like CVD or MBE. Further research and experimentation is needed to find the most efficient and cost-effective ways to fabricate quantum dots.