Four-component superlattice empirical pseudopotential method for InAs/GaSb superlattices

作者：Masur J M^*; Rehm R; Schmitz J; Kirste L; Walther M

来源：Infrared Physics & Technology, 2013, 61: 129-133.

DOI：10.1016/j.infrared.2013.07.014

• InAs/GaSb
• Superlattice
• Empirical pseudopotential method
• LWIR

For the design of InAs/GaSb superlattice (SL) heterojunction infrared photodetectors with very low dark current we have extended the standard two-component superlattice empirical pseudopotential method (SEPM) and implemented a four-component model including interface layers. For both models, the calculated bandgap values for a set of SL samples are compared to bandgaps determined by photoluminescence measurements. While the bandgap resulting from the two-component model agrees well with experimental data for SL structures with individual layer thicknesses of 7 monolayers and more, we show that for SLs with thinner GaSb layers the four-component SEPM model is accurate, when the As-content in the interface and barrier layers is included in the model.

• 出版日期2013-11