Self-assembled lateral Bi-quantum-dot molecule formation by gas-source molecular beam epitaxy

Self-assembled InAs bi-quantum-dot molecules (BQDMs) on GaAs (0 0 1) have been achieved using gas-source molecular beam epitaxy (GSMBE) and characterized by atomic force microscopy (AFM) and photoluminescence (PL) measurements. After the initial InAs quantum dots are partially capped with GaAs and f...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Journal of crystal growth 2007-04, Vol.301, p.735-739
Hauptverfasser: Suraprapapich, S., Shen, Y.M., Odnoblyudov, V.A., Fainman, Y., Panyakeow, S., Tu, C.W.
Format: Artikel
Sprache:eng
Schlagworte:
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Self-assembled InAs bi-quantum-dot molecules (BQDMs) on GaAs (0 0 1) have been achieved using gas-source molecular beam epitaxy (GSMBE) and characterized by atomic force microscopy (AFM) and photoluminescence (PL) measurements. After the initial InAs quantum dots are partially capped with GaAs and followed by deposition of InAs, BQDMs are formed. Photoluminescence spectra of BQDMs can be described by two Gaussian-fitted curves at low temperature due to two different dot sizes. This is consistent with dot height histograms obtained from AFM images of BQDMs. For PL intensity, thermal quenching is observed at temperatures above 100 K. The activation energy of BQDM PL corresponds to nonradiative recombination due to defected-related states and potential fluctuation.
ISSN:0022-0248
1873-5002
DOI:10.1016/j.jcrysgro.2006.11.120