Study of the Sb incorporation in InAs/InAsSb type-II superlattices and its influence on the band-edge profile
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.
Article Details
Journal Info
Journal of Applied Physics
American Institute of Physics
Authors (8)
M. Tornay
IES, Université de Montpellier, CNRS 1 , 34000 Montpellier,
K. Pantzas
Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies—C2N 3 , Palaiseau 91120,
G. Patriarche
Université Paris-Saclay, CNRS, Centre de Nanosciences et de Nanotechnologies—C2N 3 , Palaiseau 91120,
J.-P. Perez
IES, Université de Montpellier, CNRS 1 , 34000 Montpellier,
L. Rousseaux
ENS—Laboratoire de Physique de l’Ecole normale supérieure, Université PSL, CNRS, Sorbonne Université 4 , Paris,
Y. Guldner
ENS—Laboratoire de Physique de l’Ecole normale supérieure, Université PSL, CNRS, Sorbonne Université 4 , Paris,
N. Péré-Laperne
LYNRED, Actipole—CS 10021 2 , 364 route de Valence, 38113 Veurey-Voroize,
P. Christol
IES, Université de Montpellier, CNRS 1 , 34000 Montpellier,