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Highly tensile-strained Ge/InAlAs nanocomposites

Daehwan Jung, Joseph Faucher, Samik Mukherjee, Austin Akey, Daniel J. Ironside, Matthew Cabral, Xiahan Sang, James Lebeau, Seth R. Bank, Tonio Buonassisi, Oussama Moutanabbir and Minjoo Larry Lee

Article (2017)

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Abstract

Self-assembled nanocomposites have been extensively investigated due to the novel properties that can emerge when multiple material phases are combined. Growth of epitaxial nanocomposites using lattice-mismatched constituents also enables strain-engineering, which can be used to further enhance material properties. Here, we report self-assembled growth of highly tensile-strained Ge/In0.52Al0.48As (InAlAs) nanocomposites by using spontaneous phase separation. Transmission electron microscopy shows a high density of single-crystalline germanium nanostructures coherently embedded in InAlAs without extended defects, and Raman spectroscopy reveals a 3.8% biaxial tensile strain in the germanium nanostructures. We also show that the strain in the germanium nanostructures can be tuned to 5.3% by altering the lattice constant of the matrix material, illustrating the versatility of epitaxial nanocomposites for strain engineering. Photoluminescence and electroluminescence results are then discussed to illustrate the potential for realizing devices based on this nanocomposite material.

Department: Department of Engineering Physics
Funders: National Science Foundation, Division of Materials Reserch, Dubinsky New Research Initiative, NSERC/CRSNG, Canada Research Chairs / Chaires de recherche du Canada, Canada Foundation for Innovation / Fondation canadienne pour l'innovation (CFI), Bay Area Photovoltaic Consortium, Air Force Office of Scientific Research
Grant number: NSF DMR 1506371, AFOSR MURI Award No. FA9550-12-1-0488), NSF DMR 1508603
PolyPublie URL: https://publications.polymtl.ca/4959/
Journal Title: Nature Communications (vol. 8, no. 1)
Publisher: Nature Research
DOI: 10.1038/ncomms14204
Official URL: https://doi.org/10.1038/ncomms14204
Date Deposited: 17 Dec 2021 10:45
Last Modified: 10 Apr 2024 17:28
Cite in APA 7: Jung, D., Faucher, J., Mukherjee, S., Akey, A., Ironside, D. J., Cabral, M., Sang, X., Lebeau, J., Bank, S. R., Buonassisi, T., Moutanabbir, O., & Lee, M. L. (2017). Highly tensile-strained Ge/InAlAs nanocomposites. Nature Communications, 8(1), 14204 (7 pages). https://doi.org/10.1038/ncomms14204

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