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2-D Precursors and Interdiffusion in CdSe/ZnSe Self-Assembled Quantum Dots

Published online by Cambridge University Press:  10 February 2011

M. Dobrowolska
M. Dobrowolska*
Affiliation:
Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, [email protected]
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Abstract

This paper discusses structural and optical data taken on a series of MBE grown samples where n monolayers of CdSe (0.5< n < 2.6) was deposited on (and subsequently capped by) ZnSe. The cross-sectional scanning transmission electron microscopy (STEM) images observed on samples with lowest CdSe coverages reveal the co-existence of 2D ZnCdSe platelets and 3D islands, showing clearly that the platelets act as precursors for the formation of the 3D islands. The STEM data also present direct graphic evidence that interdiffusion plays an important role in the dynamics of CdSe quantum dot formation. The macro- and micro-photoluminescence results fully confirm the STEM data. For coverages below 1.5 monolayers, photoluminescence data show only the emission characteristic of 2D platelets, while for coverages between 1.5 and 1.9 monolayers simultaneous emissions from 2D and 3D islands are observed. The sample obtained by depositing the highest (2.6 monolayer) CdSe coverage shows only the emission characteristic of 3D islands.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 618: Symposium K – Morphological & Compositional Evolution of Heteroepitaxial… , 2000 , 91
Copyright
Copyright © Materials Research Society 2000

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