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The effect of high-In content capping layers on low-density bimodal-sized InAs quantum dots
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10.1063/1.4805351
/content/aip/journal/jap/113/19/10.1063/1.4805351
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/19/10.1063/1.4805351

Figures

Image of FIG. 1.
FIG. 1.

(a) 2 m × 2 m topographical AFM image, (b) 2 m × 2 m angle-mapped AFM image, in which the gray scale is related to the local surface slope, and (c) histogram of the QD height distribution of uncapped InAs/GaAs QDs.

Image of FIG. 2.
FIG. 2.

Experimental LAADF image of InAs QDs capped with InGaAs UCL.

Image of FIG. 3.
FIG. 3.

Normalized PL spectra of QD structures acquired at 13 K under low excitation power density (black dots) and high excitation power density (purple line); the nominal In content in the UCL is: (a) x = 0, (b) x = 0.10, (c) x = 0.20, (d) x = 0.30. PL spectra at low excitation power density are fitted with a double-gaussian profile; single gaussian curves labeled as QD1 and QD2 associated to two different QD families are also shown (red continuous lines and blue dashed lines, respectively). The arrows indicate the WL (or WL-QW) emission.

Image of FIG. 4.
FIG. 4.

Peak energies (full symbols) and FWHM (open symbols) of the QD1 and QD2 PL gaussian components as a function of temperature in InAs QDs capped with InGaAs UCL. The Varshni shift of the InAs energy gap (dashed lines) is included for comparison.

Image of FIG. 5.
FIG. 5.

Ensemble and μPL characterization of samples with x = 0.3 and x = 0.1. Red and blue arrows indicate QD1 and QD2 peak energies, respectively.

Image of FIG. 6.
FIG. 6.

PL decay curves (dot symbols) at 13 K for QD1 and QD2 families in the x = 0.30 sample. The red straight line corresponds to a monoexponential fit by taking into account the temporal response of the system, as obtained by measuring the laser pulses through the experimental setup (grey-shaded transients).

Image of FIG. 7.
FIG. 7.

Arrhenius plots of the integrated PL (a) and the recombination time (b) of the fundamental state QD1 in the four samples. Symbols correspond to the experimental data and straight lines to the simulation.

Image of FIG. 8.
FIG. 8.

Arrhenius plots of the integrated PL (a) and the recombination time (b) of the fundamental state QD2 in the four samples. Symbols correspond to the experimental data and straight lines to the simulation.

Image of FIG. 9.
FIG. 9.

State diagram proposed to interpret the observed exciton recombination dynamics. Different processes involving the capture, excitation and recombination of carriers in the WL, DS, and GS of QD are indicated by red arrows.

Tables

Generic image for table
Table I.

QD1 fitting parameters.

Generic image for table
Table II.

QD2 fitting parameters.

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/content/aip/journal/jap/113/19/10.1063/1.4805351
2013-05-16
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The effect of high-In content capping layers on low-density bimodal-sized InAs quantum dots
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/19/10.1063/1.4805351
10.1063/1.4805351
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