Modeling Energy Bands in Type II Superlattices

Zoubir Becer, Abdeldjalil Bennecer, Nouredine Sengouga

Research output: Contribution to JournalArticle

Abstract

We present a rigorous model for the overall band structure calculation using the
perturbative k.p approach for arbitrary layered cubic zincblende semiconductor nanostructures. This approach, first pioneered by Kohn and Luttinger, is faster than atomistic ab initio approaches and provides sufficiently accurate information for optoelectronic processes near high symmetry points in semiconductor crystals. k.p Hamiltonians are discretized and diagonalized using a finite element
method (FEM) with smoothed mesh near interface edges and different high order Lagrange/Hermite basis functions, hence enabling accurate determination of bound states and related quantities with a small number of elements. Such properties make the model more efficient than other numerical models that are usually used. Moreover, an energy-dependent effective mass non-parabolic model
suitable for large gap materials is also included, which offers fast and reasonably accurate results without the need to solve the full multi-band Hamiltonian. Finally, the tools are validated on three semiconductor nanostructures: (1) the bound energies of a finite quantum well using the energy-dependent effective mass non-parabolic model; (2) the InAs bulk band structure; and (3) the electronic band structure for the absorber region of photodetectors based on a type-II InAs/GaSb
superlattice at room temperature. The tools are shown to work on simple and sophisticated designs and the results show very good agreement with recently published experimental works.
Original languageEnglish
Article number629
Pages (from-to)1-22
Number of pages22
JournalCrystals
Volume9
Issue number12
DOIs
Publication statusPublished - 28 Nov 2019

Keywords

  • Bir
  • FEM
  • Multi-band k
  • P
  • Pikus Hamiltonian
  • Type-II InAs/GaSb superlattices

Fingerprint Dive into the research topics of 'Modeling Energy Bands in Type II Superlattices'. Together they form a unique fingerprint.

  • Cite this