Study of the Sb incorporation in InAs/InAsSb type-II superlattices and its influence on the band-edge profile

2025/04/22 by Matthias Tornay, Konstantinos Pantzas, G. Patriarche +5 · 1 voice · 2 citations
Engineering · Physics and Astronomy · #Advanced Semiconductor Detectors and Materials #Integrated Circuits and Semiconductor Failure Analysis #Semiconductor Quantum Structures and Devices

paper · doi:10.1063/5.0248470

openalex publication_date 2025/04/22 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

In this paper, we study the antimony distribution along the period of three InAs/InAsSb superlattices with different periods and Sb targets through multiple scanning transmission electron microscopy characterizations. The extracted Sb profiles appear to differ significantly from the targeted ones. We show that x-ray simulations are limited to determine accurately its distribution and we use the experimental profiles as inputs of a quantum structure simulation software to assess their influence on the determination of band offsets, bowing parameters, band alignments, and miniband widths. With this approach, the HH1 miniband width is broadened by a factor 2 at Γ point and the coupling with light-holes is enhanced in mid-wave short-period structures. This suggests that Sb inter-diffusion may play a less detrimental role than expected in the transport of the InAs/InAsSb material system for infrared photodetectors.

Citations

• Surface intermixing by atomic scale roughening in Sb-terminated InAs
• The atomistic mechanism for Sb segregation and As displacement of Sb in InSb(001) surfaces

Cited by

• Accurate prediction of optical transitions in epitaxial InGaAs/InAlAs asymmetric coupled quantum well structures
• Quantum Mechanical Approach for Modeling of Ternary Based Strained-Layer Superlattice

Discussions

• Interesting study of how to accurately determine the Sb content and intermixing in InAs/InAsSb superlattices to accurately determine the band structure needed to design better infrared detectors doi.o [bsky, 4 points, 0 comments]

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