We report the effects of variations in growth flux on the evolution of molecular beam epitaxy grown InAs quantum dots (QDs) and their structures and optical properties. For InAs QDs grown under As-stable conditions, evaluated through photoluminescence and atomic force microscopy (AFM) measurements, it is evident that QD size increases with pressure along with improvement in size uniformity. Furthermore, transmission electron microscopy measurements for InAs layers of critical thicknesses ( ML) showed decreasing QD density with increasing pressure accompanied by a strong reduction in photoluminescence (PL) integral intensity. These show that high fluxes suppress InAs QD formation while the decreasing PL intensity seems to indicate cluster formation that features nonradiative recombination. AFM measurements show larger and denser QDs for samples grown at higher pressures. These are explained on the basis of adatom condensation during surface cooling and the influence of pressure on indium incorporation.
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1 October 2007
Research Article|
October 11 2007
Influence of flux on the growth kinetics, structure, and optical properties of quantum dots Available to Purchase
A. Garcia;
A. Garcia
a)
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
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C. M. Mateo;
C. M. Mateo
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
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M. Defensor;
M. Defensor
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
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A. Salvador;
A. Salvador
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
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H. K. Hui;
H. K. Hui
Institute of Materials Research and Engineering
, 3 Research Link, Singapore
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C. B. Boothroyd;
C. B. Boothroyd
Institute of Materials Research and Engineering
, 3 Research Link, Singapore
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E. Philpott
E. Philpott
Institute of Materials Research and Engineering
, 3 Research Link, Singapore
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A. Garcia
a)
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
C. M. Mateo
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
M. Defensor
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
A. Salvador
Condensed Matter Physics Laboratory, National Institute of Physics,
University of the Philippines
, Diliman, 1101 Quezon City, Philippines
H. K. Hui
Institute of Materials Research and Engineering
, 3 Research Link, Singapore
C. B. Boothroyd
Institute of Materials Research and Engineering
, 3 Research Link, Singapore
E. Philpott
Institute of Materials Research and Engineering
, 3 Research Link, Singaporea)
Electronic mail: [email protected]
J. Appl. Phys. 102, 073526 (2007)
Article history
Received:
April 30 2007
Accepted:
August 06 2007
Citation
A. Garcia, C. M. Mateo, M. Defensor, A. Salvador, H. K. Hui, C. B. Boothroyd, E. Philpott; Influence of flux on the growth kinetics, structure, and optical properties of quantum dots. J. Appl. Phys. 1 October 2007; 102 (7): 073526. https://doi.org/10.1063/1.2785969
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