Inelasticity and precipitation of germanium from a solid solution in Al-Ge binary alloys

Core-Shell Germanium/Germanium–Tin Nanowires Exhibiting Room-Temperature Direct- and Indirect-Gap Photoluminescence

“…Under all Sn precursor partial pressure flows, small Sn-rich precipitates and Sn-rich planar coherent defects are seen in the Ge 1– x Sn x shell region (Figures and ). Similar coherent Sn defects have previously been reported in both Si and Ge crystals. − The small precipitates can be distinguished by the Moiré fringes in the TEM image, and EDS shows Sn compositions greater than 50 at. % in the precipitates (Figure a, b).…”

“…The Sn-rich coherent defects are not observed in XRD. Consistent with the TEM analysis showing a coherent interface with the surrounding Ge 1– x Sn x , this suggests that these defects have the same crystallographic registry − as the surrounding material; the defects occupy too small a volume fraction compared to the rest of the epitaxial Ge/Ge 1– x Sn x core-shell nanowires to be detected using lab-source XRD. Sn-rich precipitates observed on the surface of the nanowires in TEM also are not detected in XRD.…”