Highly tensile-strained Ge/InAlAs nanocomposites

Title
Highly tensile-strained Ge/InAlAs nanocomposites
Authors
정대환Joseph FaucherSamik MukherjeeAustin AkeyDaniel J. IronsideMatthew CabralXiahan SangJames LebeauSeth R. BankTonio BuonassisiOussama MoutanabbirMinjoo Larry Lee
Issue Date
2017-01
Publisher
Nature Communications
Citation
VOL 8, 14204
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.
URI
http://pubs.kist.re.kr/handle/201004/72278
ISSN
2041-1723
Appears in Collections:
KIST Publication > Article
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