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Epitaxial Ge0.81Sn0.19 Nanowires for Nanoscale Mid-Infrared Emitters

Cite this: ACS Nano 2019, 13, 7, 8047–8054
Publication Date (Web):July 8, 2019
Copyright © 2019 American Chemical Society

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    Abstract Image

    Highly oriented Ge0.81Sn0.19 nanowires have been synthesized by a low-temperature chemical vapor deposition growth technique. The nanostructures form by a self-seeded vapor–liquid–solid mechanism. In this process, liquid metallic Sn seeds enable the anisotropic crystal growth and act as a sole source of Sn for the formation of the metastable Ge1–xSnx semiconductor material. The strain relaxation for a lattice mismatch of ε = 2.94% between the Ge (111) substrate and the constant Ge0.81Sn0.19 composition of nanowires is confined to a transition zone of <100 nm. In contrast, Ge1–xSnx structures with diameters in the micrometer range show a 5-fold longer compositional gradient very similar to epitaxial thin-film growth. Effects of the Sn growth promoters’ dimensions on the morphological and compositional evolution of Ge1–xSnx are described. The temperature- and laser power-dependent photoluminescence analyses verify the formation of a direct band gap material with emission in the mid-infrared region and values expected for unstrained Ge0.81Sn0.19 (e.g., band gap of 0.3 eV at room temperature). These materials  hold promise in applications such as thermal imaging and photodetection as well as building blocks for group IV-based mid- to near-IR photonics.

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    The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acsnano.9b02843.

    • Statistics on size of oriented NWs, additional STEM-EDX maps, SEM images, and PL data as well as examples for fitting operations (PDF)

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