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. 2012 Jan 19;109(5):1407-1412. doi: 10.1073/pnas.1120415109

Fig. 1.

Fig. 1.

Design, synthesis, and characterization of polymorphic core/multishell NWs. (A) Three dimensional schematic of a typical core/shell NW and cross-sectional schematics of four core/shell diode geometries investigated as standalone single-NW solar cells. (B) SEM image of an as-grown, core/shell p/in Si NW; scale bar, 100 nm. (C) Left: bright-field TEM image of a NW cross-section showing a core surrounded by crystalline shell; scale bar, 50 nm. Right: electron diffraction pattern for the cross-section on left showing it is oriented along the [112] zone axis. (D) High-resolution bright-field, aberration-corrected TEM image at the {011}, {113} vertex of a NW cross-section revealing clear lattice fringes; scale bar, 5 nm. (E) Phosphorous (red) and oxygen (green) line profiles across a NW cross-section acquired from EDS elemental mapping on an aberration-corrected STEM. Inset: cs-STEM image of NW cross-section from which data was taken; scale bar, 100 nm.