Sb-induced strain fluctuations in a strained layer superlattice of InAs/InAsSb

Kim, Honggyu; Meng, Yifei; Klem, John F.; Hawkins, Samuel D.; Kim, Jin K.; Zuo, Jian-Min

doi:10.1063/1.4993673

Title: Sb-induced strain fluctuations in a strained layer superlattice of InAs/InAsSb

Journal Article · 28 April 2018 · Journal of Applied Physics

DOI: https://doi.org/10.1063/1.4993673 · OSTI ID:1411606

Kim, Honggyu ^[1];

^[1]; Klem, John F. ^[2]; Hawkins, Samuel D. ^[2]; Kim, Jin K. ^[2]; Zuo, Jian-Min ^[1]

Univ. of Illinois, Urbana, IL (United States). Dept. of Materials Science and Engineering, Frederick Seitz Materials Research Lab.
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

Here, we show that Sb substitution for As in a MBE grown InAs/InAsSb strained layer superlattice (SLS) is accompanied by significant strain fluctuations. The SLS was observed using scanning transmission electron microscopy along the [100] zone axis where the cation and anion atomic columns are separately resolved. Strain analysis based on atomic column positions reveals asymmetrical transitions in the strain profile across the SLS interfaces. The averaged strain profile is quantitatively fitted to the segregation model, which yields a distribution of Sb in agreement with our scanning tunneling microscopy result. The subtraction of the calculated strain reveals an increase in strain fluctuations with the Sb concentration, as well as isolated regions with large strain deviations extending spatially over ~1 nm, which suggest the presence of point defects.

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Research Organization:: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Laboratories (SNL-CA), Livermore, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC04-94AL85000; NA0003525; W911NF-10-1-0524

OSTI ID:: 1411606

Report Number(s):: SAND2017-6813J; 654869; TRN: US1800245

Journal Information:: Journal of Applied Physics, Vol. 123, Issue 16; ISSN 0021-8979

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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