Abstract
The self-assembled InAsN quantum dots (QDs) were grown on the GaAs (001) substrates by MOVPE using 1,1-dimethlhydrazine (DMHy) and tertiarybutylarsine (TBAs) as the N and As precursors, respectively. The size distribution of the InAs(N) QDs grown at 450 °C and 420 °C is found bimodal. The InAsN QDs are typically 4-11 nm in height and 30-41 nm in width. The N incorporation into InAs induces the decrease of the QDs size, due to the increase of the wetting layer thickness. The density of the InAsN QDs with a nominal source supply of 2.6-3.0 ML, increases from 1.1-1.3×1010 cm–2 for the 450 °C growth to 2.1-2.3×1010 cm–2 for the 420 °C growth. The photoluminescence peaks (at 300 K) of the InAs(N) QDs grown at both temperatures clearly show a red-shift to 1200 nm by N incorporation. This red-shift is in contrast with the blue-shift expected from the decrease in the dot sizes (quantum size effect), indicating the huge bandgap bowing induced by N incorporation is dominant over the quantum size effect. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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