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Diamond cubic Sn-rich nanocrystals: synthesis, microstructure and optical properties

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Abstract

Diamond cubic Sn-rich nanocrystals were fabricated with radii less than 20 nm by post-growth annealing at T=750 °C of SnxGe1-x alloys grown on Ge(001) by molecular beam epitaxy. The crystal phase of the Sn-rich nanocrystals was determined to be diamond cubic from Fourier transform analysis of high-resolution transmission electron microscopy images. Optical transmittance of these SnxGe1-x/Ge (001) films demonstrated changes in optical absorption that can be attributed to absorption from the nanocrystals. The energy bandgap was measured to be 0.45 eV for nanocrystals arrays in Ge with a mean diameter of 32 nm.

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Authors and Affiliations

  1. Thomas J. Watson Laboratory of Applied Physics, California Institute of Technology, Mail Stop 128-95, Pasadena, CA, 91125, USA

    R. Ragan & H.A. Atwater

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  1. R. Ragan
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  2. H.A. Atwater
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Correspondence to R. Ragan.

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PACS

68.37.Lp; 78.67.Hc; 81.07.Ta; 81.16.Dn; 68.65.Hb

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Ragan, R., Atwater, H. Diamond cubic Sn-rich nanocrystals: synthesis, microstructure and optical properties. Appl. Phys. A 80, 1335–1338 (2005). https://doi.org/10.1007/s00339-004-3163-3

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  • DOI: https://doi.org/10.1007/s00339-004-3163-3

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