Self-limiting growth of quantum dot heterostructures on nonplanar{111}Bsubstrates
作者:
A. Hartmann,
L. Loubies,
F. Reinhardt,
E. Kapon,
期刊:
Applied Physics Letters
(AIP Available online 1997)
卷期:
Volume 71,
issue 10
页码: 1314-1316
ISSN:0003-6951
年代: 1997
DOI:10.1063/1.119882
出版商: AIP
数据来源: AIP
摘要:
We study the evolution of AlGaAs/GaAs growth during organometallic chemical vapor deposition on pyramidal recess patterns etched into GaAs{111}Bsubstrates. Cross-sectional atomic force microscopy clearly demonstrates the self-organized growth behavior in the inverted pyramid structures. During AlGaAs deposition, the side corners and the tip of the pyramid sharpen up to a self-limited radius of curvature of less than 10 nm. In addition, vertical Ga-rich AlGaAs quantum wells are formed at these corners. Subsequent GaAs growth results in the formation of GaAs quantum wires along the corners of the pyramid. These wires meet at the tip of the pyramid, forming a quantum dot structure at this point. ©1997 American Institute of Physics.
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