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Highly tensile-strained Ge/InAlAs nanocomposites

Author

Listed:
  • Daehwan Jung

    (Yale University)

  • Joseph Faucher

    (Yale University)

  • Samik Mukherjee

    (École Polytechnique de Montreal, Montreal)

  • Austin Akey

    (Massachusetts Institute of Technology)

  • Daniel J. Ironside

    (University of Texas at Austin)

  • Matthew Cabral

    (North Carolina State University)

  • Xiahan Sang

    (North Carolina State University)

  • James Lebeau

    (North Carolina State University)

  • Seth R. Bank

    (University of Texas at Austin)

  • Tonio Buonassisi

    (Massachusetts Institute of Technology)

  • Oussama Moutanabbir

    (École Polytechnique de Montreal, Montreal)

  • Minjoo Larry Lee

    (Yale University
    University of Illinois at Urbana-Champaign)

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.

Suggested Citation

  • Daehwan Jung & Joseph Faucher & Samik Mukherjee & Austin Akey & Daniel J. Ironside & Matthew Cabral & Xiahan Sang & James Lebeau & Seth R. Bank & Tonio Buonassisi & Oussama Moutanabbir & Minjoo Larry , 2017. "Highly tensile-strained Ge/InAlAs nanocomposites," Nature Communications, Nature, vol. 8(1), pages 1-7, April.
    • Handle: RePEc:nat:natcom:v:8:y:2017:i:1:d:10.1038_ncomms14204
    DOI: 10.1038/ncomms14204
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