Structural investigation of hierarchically self‐assembled GaAs/AlGaAs quantum dots
Structural investigation of hierarchically self‐assembled GaAs/AlGaAs quantum dots
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分级自组装GaAs/AlGaAs量子点的结构研究
DOI:
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发表时间:
2006
期刊:
影响因子:
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通讯作者:
M. Dähne
中科院分区:
文献类型:
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作者:
A. Lenz;R. Timm;H. Eisele;L. Ivanova;Dominik Martin;V. Voßebürger;A. Rastelli;O. Schmidt;M. Dähne
Recent investigations of self‐organized unstrained inverted GaAs/AlGaAs quantum dots, prepared by a combination of Stranski–Krastanov growth mode and an in situ etching technique, show GaAs quantum dots with large confinement energy and high size homogeneity. Here we present first cross‐sectional scanning tunneling microscopy data of these quantum dots, characterized by a lateral extension of about 35 nm, heights of about 5–6 nm, and a reversed truncated pyramidal shape. We further observe a decomposition of the AlGaAs host layers and a roughening of the AlGaAs/GaAs interfaces. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)