Semiconductors

, Volume 42, Issue 3, pp 291–297

The role of transport processes of nonequilibrium charge carriers in radiative properties of arrays of InAs/GaAs quantum dots

  • A. S. Shkolnik
  • A. V. Savelyev
  • L. Ya. Karachinsky
  • N. Yu. Gordeev
  • R. P. Seisyan
  • G. G. Zegrya
  • S. Pellegrini
  • G. S. Buller
  • V. P. Evtikhiev
Low-Dimensional Systems

DOI: 10.1134/S1063782608030093

Cite this article as:
Shkolnik, A.S., Savelyev, A.V., Karachinsky, L.Y. et al. Semiconductors (2008) 42: 291. doi:10.1134/S1063782608030093

Abstract

The results of time-resolved photoluminescence studies of heterostructures containing monolayer arrays of InAs/GaAs quantum dots are presented. A two-component time dependence of intensity of photoluminescence from the ground state of quantum dots, with characteristic times of the slow component up to hundreds of nanoseconds and those of rapid one several nanoseconds, is studied. It is shown that the slow component is determined by the transport of nonequilibrium charge carriers between the quantum dots. At low temperatures, the time of the slow component is determined by tunneling, and at high temperatures by thermal escape of nonequilibrium charge carriers. The ratio of the contributions of tunneling and thermal escape is determined by the degree of isolation of quantum dots. A theoretical model is constructed that describes the effect of the dynamics of carrier transport on the emergence and decay of the slow component of photoluminescence.

PACS numbers

73.21.La73.63.-b

Copyright information

© Pleiades Publishing, Ltd. 2008

Authors and Affiliations

  • A. S. Shkolnik
    • 1
  • A. V. Savelyev
    • 2
  • L. Ya. Karachinsky
    • 1
  • N. Yu. Gordeev
    • 1
  • R. P. Seisyan
    • 1
  • G. G. Zegrya
    • 1
  • S. Pellegrini
    • 3
  • G. S. Buller
    • 3
  • V. P. Evtikhiev
    • 1
  1. 1.Ioffe Physicotechnical InstituteRussian Academy of SciencesSt. PetersburgRussia
  2. 2.St. Petersburg State Polytechnical UniversitySt. PetersburgRussia
  3. 3.School of Engineering and Physical ScienceHeriot-Watt UniversityRiccarton, EdinburghUK