We describe the properties and carrier dynamics of surface InP quantum dots (QDs) on In0.48Ga0.52P, lattice-matched to GaAs (100). The structures were grown using gas-source molecular beam epitaxy. The average height and lateral size of the dots are in the range of 2–6 and 30–50 nm, respectively. The photoluminescence of the surface dots peaks between 750 and 830 nm, depending on the growth conditions, and is red-shifted compared to the emission of the capped QDs grown under similar conditions. The integrated photoluminescence intensity is comparable to that of the capped QDs. The decay time of both surface and capped QDs is around 1 ns at 15 K. The strong luminescence of surface QDs is explained by the effect of acting vacuum/air as an effective barrier and saturated surface states. Enhancement of the QDs luminescence is observed for the samples coated with a fluorescent dye.
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28 October 2013
Research Article|
October 25 2013
Surface InP/In0.48Ga0.52P quantum dots: Carrier recombination dynamics and their interaction with fluorescent dyes
Karine Hestroffer;
Karine Hestroffer
1
Institute of Physics, Humboldt–University Berlin
, 12489 Berlin, Germany
2
Max Born Institute for Nonlinear Optics and Ultrafast Spectroscopy
, 2A Max–Born–Str., 12489 Berlin, Germany
3
CEA–CNRS group “Nanophysique et Semiconducteurs,” Institut Néel/CNRS–Univ. J. Fourier and CEA Grenoble, INAC, SP2M
, 17 rue des Martyrs, 38 054 Grenoble, France
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Robert Braun;
Robert Braun
1
Institute of Physics, Humboldt–University Berlin
, 12489 Berlin, Germany
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Asli Ugur;
Asli Ugur
1
Institute of Physics, Humboldt–University Berlin
, 12489 Berlin, Germany
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Jens W. Tomm;
Jens W. Tomm
2
Max Born Institute for Nonlinear Optics and Ultrafast Spectroscopy
, 2A Max–Born–Str., 12489 Berlin, Germany
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Steffen Hackbarth;
Steffen Hackbarth
1
Institute of Physics, Humboldt–University Berlin
, 12489 Berlin, Germany
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Beate Röder;
Beate Röder
1
Institute of Physics, Humboldt–University Berlin
, 12489 Berlin, Germany
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Fariba Hatami
Fariba Hatami
1
Institute of Physics, Humboldt–University Berlin
, 12489 Berlin, Germany
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J. Appl. Phys. 114, 163510 (2013)
Article history
Received:
September 25 2013
Accepted:
October 10 2013
Citation
Karine Hestroffer, Robert Braun, Asli Ugur, Jens W. Tomm, Steffen Hackbarth, Beate Röder, Fariba Hatami; Surface InP/In0.48Ga0.52P quantum dots: Carrier recombination dynamics and their interaction with fluorescent dyes. J. Appl. Phys. 28 October 2013; 114 (16): 163510. https://doi.org/10.1063/1.4827188
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