Strain evolution and confinement effect in InAs/AlAs short-period superlattices studied by Raman spectroscopy.

Journal Article (Journal Article)

Raman spectra of two series of InAs/AlAs short-period superlattices were measured at room temperature to investigate the impact of strain on the phonon modes taking into consideration the confinement effect and interface mode. The evolution of strain in the InAs layer and the AlAs layer was studied in (InAs)2 /(AlAs)2 superlattices grown at various temperatures (400-550 °C). While the strain existed in the AlAs layer remained almost constant, the strain in the InAs layer varied significantly as the growth temperature increased from 500 to 550 °C. The confinement effect on the optical phonons was analyzed based on results from (InAs)n /(AlAs)n grown at 450 °C (n = 2, 3, 4, and 5). Additionally, the confinement effect was found to be stronger in shorter periods with higher interface quality. The interface phonon modes were resolved between the longitudinal optical and transverse optical phonon modes, which assist in the rough estimation of the thickness of the layers. The disorder-activated acoustic phonon modes at the low-frequency side were also addressed.

Full Text

Duke Authors

Cited Authors

  • Zhao, Y; Lu, K; Yao, J; Ning, J; Chen, B; Lu, H; Zheng, C

Published Date

  • January 2023

Published In

Volume / Issue

  • 13 / 1

Start / End Page

  • 123 -

PubMed ID

  • 36599857

Pubmed Central ID

  • PMC9812983

Electronic International Standard Serial Number (EISSN)

  • 2045-2322

International Standard Serial Number (ISSN)

  • 2045-2322

Digital Object Identifier (DOI)

  • 10.1038/s41598-022-26368-8


  • eng