Exploring the Internal Radiative Efficiency of Selective Area Nanowires

Figure 2

Effect of the growth temperature and V/III ratio on PL intensity. (a) Series of spectra of the absolute PL intensity versus energy, measured for samples grown at different temperatures between 690°C and 770°C, with a V/III ratio of 114. The intensity increases when the temperature is raised up to 730°C, but decreases strongly at higher temperatures. Two vertical lines, at 1.42 eV and 1.45 eV, indicate the position of the and transitions. (b) Peak integrated PL intensity, as a function of growth temperature, measured at a laser power equivalent to 10 suns, showing the same trend as in panel (a). (c) Series of spectra normalized to the maximum of each one, measured on samples grown at different temperatures. (d) Series of spectra of the absolute PL intensity versus energy, measured for samples grown at different V/III ratios, between 41 and 164, at a growth temperature of 730°C. The intensity increases when V/III is raised up to 114, but decreases strongly at a higher ratio. Two vertical lines, at 1.42 eV and 1.45 eV, indicate the position of the and transitions. (e) Peak integrated PL intensity, as a function of V/III ratio, measured at a laser power equivalent to 10 suns, showing the same trend as in panel (d). (f) Normalized spectra calculated from the absolute spectra of panel (d), highlighting the negligible difference between the spectra.

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