Temperature-dependent photoluminescence imaging of GaAs/AlGaAs heterostructure quantum well tubes

ORAL

Abstract

Two sets of GaAs/AlGaAs core-multi shell nanowire quantum well tubes (QWTs) grown by MOCVD, with QW widths of 2nm and 6nm are dispersed onto a 4mm diameter hemispherical solid immersion lens. We obtain high spatial resolution photoluminescence (PL) images of single nanowires (NWs) from 10 K up to 120 K. High spectral resolution PL spectra reveal several narrow emission lines on high energy side of the 2nm QWT at low temperatures. In the 6nm QW, such narrow emission lines are not observed. Spatially-resolved PL images show that these localized states are randomly distributed along the NW long axis. Temperature-dependent PL imaging indicates that the quantum dot emissions disappear at temperatures above 50K. The recombination lifetime for electrons and holes in the QWT for the 2nm and 6nm QWTs are 500ps and 800 ps, respectively. We observe the recombination lifetime increases slightly with increasing temperature.

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Authors

  • Teng Shi

    University of Cincinnati, Department of Physics, University of Cincinnati, Ohio 45221-0011, USA

  • Howard Jackson

    University of Cincinnati

  • Leigh Smith

    University of Cincinnati, Department of Physics, University of Cincinnati, Ohio 45221-0011, USA

  • Jan Yarrison-Rice

    Miami University

  • Nian Jiang

    Australian National University

  • H. Hoe Tan

    Australian National University, Department of Electronic and Materials Engineering, Australian National University, Canberra, ACT, 0200, Australia

  • Qiang Gao

    Australian National University, Canberra, Australia, Department of Electronic Materials Engineering, Australian National University, Canberra, Australia, Australian National University, Department of Electronic and Materials Engineering, Australian National University, Canberra, ACT, 0200, Australia

  • Chennupati Jagadish

    Australian National University, Department of Electronic and Materials Engineering, Australian National University, Canberra, ACT, 0200, Australia