Valence-band offsets at the AlxGa0.5−xIn0.5P-ZnSe(001) lattice-matched interface

F. Benardini, R.M. Nieminen

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The difficulty in making good Ohmic contact at the interfaces with p-doped ZnSe is an important problem hindering the realization of blue-light-emitting diode lasers based on the II-VI semiconductor technology. So far no metal or semiconductor material has been found to have a low enough barrier at the (001) interface with ZnSe. A possible solution to this problem is the insertion of a so-called barrier-reduction layer at the interface with ZnSe. We have investigated the interface formation energies and valence-band offsets at the (001) interface between AlxGa0.5−xIn0.5P and ZnSe. The results of our calculations show the existence of a strong interdependence between the valence-band offset and the interface geometric structure. The interface is found to have structural and electronic similarities to the GaAs-ZnSe(001) system. The very low values obtained for the valence-band offset confirm the possibility of using this material as a major constituent of the barrier-reduction layer.
Original languageEnglish
Pages (from-to)1718-1723
JournalPhysical Review B
Issue number3
Publication statusPublished - 1997
MoE publication typeA1 Journal article-refereed


  • semiconductor interface
  • valence-band offsets


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