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Schematic diagrams of the whole processes which involve (a) the formation of Ga droplets on Si substrates, (b) the growth of GaInP/GaP DH core-shell NWs, (c) PDMS application and curing processes, (d) peeling-off process, and (e) turnover for structural analyses and optical characterization. (f) Schematic and digital camera images of the fabricated NWs embedded in PDMS membranes.
(a) Top-view and (b) bird-eye-view SEM images of GaInP/GaP DH core-shell NWs on Si (111) substrates. (c) Cross-sectional side-view TEM image of the NWs. (d) Bird-eye-view SEM images of the NWs embedded in PDMS membranes. An inset is the SEM image of the PDMS membranes without NWs.
PL spectra at 77 K of GaInP/GaP DH core-shell NWs on Si substrates with different incident pump power densities ranging from to 6 mW.
(a) Digital camera images of the NWs in PDMS membranes measured at 77 K with an excitation by a 6 mW blue 403 nm semiconductor lasers through a high-pass filter which cuts the signal below 420 nm. An inset is the image without the high-pass filter. (b) PL spectra at 77 K of GaInP/GaP DH core-shell NWs on Si substrates, the NWs in PDMS membranes, and PDMS membranes without NWs.
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