InAs/InAsSb strain balanced superlattices for optical detectors: material properties and energy band simulations

Par Conseil national de recherches du Canada

DOI	Trouver le DOI : https://doi.org/10.1063/1.3681328
Auteur	Rechercher : Lackner, D.; Rechercher : Steger, M.; Rechercher : Thewalt, M. L. W.; Rechercher : Pitts, O. J.; Rechercher : Cherng, Y. T.; Rechercher : Watkins, S. P.; Rechercher : Plis, E.; Rechercher : Krishna, S.
Format	Texte, Article
Résumé	InAsSb/InAs type II strain balanced superlattices lattice matched to GaSb have recently been proposed as an alternative to InAs/(In)GaSb short period superlattices for mid- to long infrared photodetectors. Photoluminescence data at 4 K of OMVPE grown InAsSb (multi-) quantum wells in an InAs matrix on InAs and GaSb substrates is presented for Sb compositions between 4% and 27%. The measured transition energies are simulated with a self-consistent Poisson and Schroedinger equation solver that includes strain and band-offsets. The fitted parameters are then used to predict the type II transition energies of InAsSb/InAs strain balanced superlattice absorber stacks at 77 K for different compositions and periods. The optical matrix element was calculated and compared with InAs/(In)GaSb superlattices. The InAsSb/InAs structures can be designed with higher or equal matrix elements for longer periods. Finally, the initial optical response data of an unoptimized strain balanced InAs0.79Sb0.21/InAs detector with a 40 nm period are shown. Its cutoff wavelength is 0.15 eV (8.5 μm), in good agreement with the predicted type II transition energy of 0.17 eV.
Date de publication	2012-02-10
Dans	Journal of Applied Physics 111, nº 034507 (10 février 2012).
Langue	anglais
Publications évaluées par des pairs	Oui
Publication du CNRC	Cette publication n’est pas du CNRC Ce sont des publications qui ont été rédigées par un auteur du CNRC, mais avant que celui-ci soit employé du CNRC.
Numéro NPARC	21269027
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Identificateur de l’enregistrement	52d99548-8bb4-4ef5-9746-951963418ff7
Enregistrement créé	2013-12-02
Enregistrement modifié	2020-04-21

Date de modification :: 2024-04-18