Superlattice Band Gap Tool
Application ID: 45281
The Superlattice Band Gap Tool helps the design of periodic structures made of two alternating semiconductor materials (superlattices). The tool uses the effective mass Schrödinger equation to estimate the electron and hole ground state energy levels in a given superlattice structure. Device engineers can use the tool to quickly compute the effective band gap for a given periodic structure and iterate the design parameters until they reach a desired band gap value.
To use the app, enter the desired superlattice parameters, including the widths of the well and the barrier layer, the effective masses for electrons and holes in those layers, the band gaps in those layers, and the conduction band offset. The valence band offset is updated automatically and should be checked for positivity by the app user. The user can also control the maximum mesh element size used for the studies. Click the Compute button to compute the shift in the conduction and valance band edge and the effective band gap. The electron and hole wave functions are plotted in the Graphics window.
You can find out more about the demo app in this blog post: "Computing the Band Gap in Superlattices with the Schrödinger Equation"
This application example illustrates applications of this type that would nominally be built using the following products:
however, additional products may be required to completely define and model it. Furthermore, this example may also be defined and modeled using components from the following product combinations:
The combination of COMSOL® products required to model your application depends on several factors and may include boundary conditions, material properties, physics interfaces, and part libraries. Particular functionality may be common to several products. To determine the right combination of products for your modeling needs, review the Specification Chart and make use of a free evaluation license. The COMSOL Sales and Support teams are available for answering any questions you may have regarding this.