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(a) A FESEM micrograph of the core-shell NWs studied. (b) A TEM micrograph of a GaAs NW core without AlGaAs shell layer. This shows the minimal tapering and straight sidewalls of the GaAs cores. (c) A magnified TEM micrograph of the same GaAs NW which shows the absence of twin defects.
cw PL spectra as a function of power from single NW (wire 2). .
Low-power time decays accumulated at the peak emission energy from three single core-shell NWs grown using the two-temperature technique.
Time-resolved spectra from a NW (wire 4) which exhibits a recombination lifetime of . (a) An emission energy vs time 2D map. Lighter colors represent higher intensities than darker colors. (b) Spectra extracted from the time-resolved spectrum at 50, 300, 600, and after the laser pulse and plotted on an enlarged energy scale. Arrows (blue) show the calculated band gap renormalization and the sum of the electron and hole Fermi energies for an electron-hole pair density of at zero temperature.
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