Quantum Dot

solidex06.in : Quantum Dot

Requires: Victory Mesh
Minimum Versions: Victory Mesh 1.4.7.R
Quantum dots are of interest in recent LED technology. The formation of a quantum dot within traditional etch/deposit engines is not practical. However, solid modeling techniques can be used to greatly simplify their creation.
This example will illustrate how to generate a quantum dot using a number of Victory Mesh solid modeling commands.
The example begins with a cuboid of oxide. The cuboid is a volumetric mesh of tetrahedra. Extracting the surface mesh of the cuboid, needed for later stages, can be done with the skeleton command.
The sphere of Cds is generated with the sphere command. The surface of the sphere is extracted with the skeleton command. The splice command is then used to splice this sphere into the oxide to prepare the interface mesh for subsequent insertion into the cuboid using the combine command.
This process is repeated for the core (CdSe) of the quantum dot structure.
To contact the quantum dot electrically, electrode regions are defined above and under the quantum dot. This is done using the slice command. This will split the device into five layers (with the various regions inside each layer).
The tag and material commands can then be used to change the material of the anode/cathode regions. It is now a viable device for a remesh. The example illustrates the Delaunay remesh and some interface refinement around the sphere interfaces.
The anode/cathode contacts are then attached using the tag and electrode commands. Note that the electrode command will form volume electrodes (other electrode types are available).
In this example the clip command is also used to show the internal quality of the refined Delaunay mesh. The clip command does not change the mesh, it simply sets the simplices outside of the clip region to gas allowing visual inspection of the internal mesh.