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Charge confinement and uniformity of stacked InP quantum dots studied by magneto-optical spectroscopy

Research output: Contribution to journalJournal article

Published

  • Jochen Maes
  • M Hayne
  • Yvonne M Manz
  • Oliver G Schmidt
  • Karl Eberl
  • Victor V Moshchalkov
Journal publication date03/2002
JournalPhysica E: Low-dimensional Systems and Nanostructures
Journal number2-4
Volume13
Number of pages5
Pages203-207
Original languageEnglish

Abstract

We have studied the magneto-photo luminescence (PL) of triply stacked layers of self-assembled InP quantum dots, For a small separation of the uppermost dot in (he triple stack from the other two closely stacked layers, only one PL peak is observed, whereas for a large separation two PL peaks are present: a broad low-energy and a narrow high-energy peak. We propose a model in which the low-energy peak is associated with the uppermost dot where alignment faults result in enhanced size fluctuations, broadening the line, The narrow high-energy peak originates from charges located in the double stack. In the large separation regime, an increased broadening of the PL line-width indicates that the size fluctuations are augmented as the layer separation is increased from 15 to 30 nm. (C) 2002 Elsevier Science B.V. All rights reserved.