Evolution of the energy levels in quantum dot ensembles with different densities

被引：37

作者：

Fafard, S ^{[1
]}

Wasilewski, ZR ^{[1
]}

Spanner, M ^{[1
]}

机构：

[1] Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada

来源：

APPLIED PHYSICS LETTERS | 1999年 / 75卷 / 13期

关键词：

D O I：

10.1063/1.124854

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Ensembles of self-assembled InAs/GaAs quantum dots (QDs) have been obtained with different densities by molecular beam epitaxy. The evolution of the structural and optical properties with coverage shows that lateral interactions are present for QD spacings of hundreds of nanometers (coverage > similar to 10(9) QDs/cm(2)). Clear evidence for transfer of InAs from the wetting layer to the QDs is observed at the onset of the Stranski-Krastanow's island formation for 1.83 monolayers (MLs). QDs with sharp electronic shell structures are observed by state-filling spectroscopy for the low density ensembles (1.83-1.91 ML). A decrease in the photoluminescence intensity is observed for more than 1.96 ML and is associated with the coalescence of the islands. (C) 1999 American Institute of Physics. [S0003-6951(99)03139-3].

引用

页码：1866 / 1868

页数：3

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