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Proceedings Paper

InSb quantum dots and quantum rings in a narrow-gap InAsSbP matrix
Author(s): K. D. Moiseev; M. P. Mikhailova; Ya. A. Parkhomenko; E. V. Gushchina; S. S. Kizhaev; E. V. Ivanov; N. A. Bert; Yu. P. Yakovlev
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Paper Abstract

We report a study of InSb quantum dots and quantum rings grown on InAs(100) substrate by LPE-MOVPE combine method. Characterization of InSb/InAs(Sb,P) quantum dots was performed using atomic force microscopy and transmission electron microscopy. The bimodal growth of uncapped InSb quantum dots was observed in the temperature range T=420-450 °C. The low-density (5×108 cm-2) large quantum dots with dimensions of 12-14 nm in height and 45-50 nm in diameter are appeared at 445 °C, whereas high-density (1×1010 cm-2) dislocation-free small quantum dots with dimensions of 3-5 nm in height and 11-13 nm in diameter were obtained at 430 °C. Capping of the InSb quantum dots by binary InAs or InAsSbP epilayers lattice-matched with InAs substrate was performed using MOVPE method. Tunnel-related behavior in a forward curve of I-V characteristics was observed in heterostructures with buried InSb quantum dots inserted in InAs p-n junction. Evolution of electroluminescence spectra on driving current at negative bias and suppression of negative luminescence from buried InSb/InAs quantum dots were found out in the spectral range 3-4 μm at 300 K. Deposition from the InSb melt over the InAsSb0.05P0.10 capping layer resulted in the formation of InSb quantum rings with outer and inner diameters about 20-30 nm and 15-18 nm respectively. Surface density of the quantum rings of 2.6×1010 cm-2 was reached at 430 °C.

Paper Details

Date Published: 14 February 2009
PDF: 9 pages
Proc. SPIE 7224, Quantum Dots, Particles, and Nanoclusters VI, 72240B (14 February 2009); doi: 10.1117/12.809312
Show Author Affiliations
K. D. Moiseev, A.F. Ioffe Physico-Technical Institute (Russian Federation)
M. P. Mikhailova, A.F. Ioffe Physico-Technical Institute (Russian Federation)
Ya. A. Parkhomenko, A.F. Ioffe Physico-Technical Institute (Russian Federation)
E. V. Gushchina, A.F. Ioffe Physico-Technical Institute (Russian Federation)
S. S. Kizhaev, A.F. Ioffe Physico-Technical Institute (Russian Federation)
E. V. Ivanov, A.F. Ioffe Physico-Technical Institute (Russian Federation)
N. A. Bert, A.F. Ioffe Physico-Technical Institute (Russian Federation)
Yu. P. Yakovlev, A.F. Ioffe Physico-Technical Institute (Russian Federation)


Published in SPIE Proceedings Vol. 7224:
Quantum Dots, Particles, and Nanoclusters VI
Kurt G. Eyink; Frank Szmulowicz; Diana L. Huffaker, Editor(s)

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