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Atomic Ordering in Self-assembled Epitaxial II-VI and IV-VI Compound Semiconductor Quantum Dot Systems

Published online by Cambridge University Press:  11 February 2011

Peter Möck,
Klaus Pierz,
Teya Topuria,
Nigel D. Browning,
Huizhen Wu and
Patrick J. McCann
Peter Möck
Affiliation:
Portland State University, Department of Physics, P.O.Box 751, Portland, OR 97207–0751, pmoeck@pdx.edu
Klaus Pierz
Affiliation:
Physikalisch-Technische Bundesanstalt Braunschweig, Bundesallee 100, 38116 Braunschweig, Federal, Republic of Germany
Teya Topuria
Affiliation:
University of Illinois at Chicago, Department of Physics, 845 W.Taylor Street, Chicago, Illinois 60607–7059
Nigel D. Browning
Affiliation:
University of Illinois at Chicago, Department of Physics, 845 W.Taylor Street, Chicago, Illinois 60607–7059
Huizhen Wu
Affiliation:
University of Oklahoma, School of Electrical and Computer Engineering, Norman, OK 73019
Patrick J. McCann
Affiliation:
University of Oklahoma, School of Electrical and Computer Engineering, Norman, OK 73019
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Abstract

Transmission electron microcopy (TEM) in both the parallel illumination and scanning probe mode revealed atomically ordered entities within a 5 to 250 nm range in a IV-VI and a II-VI compound semiconductor quantum dot (QD) system. While the II-VI system was a nominal [001] CdSe/(Mn0.1Zn0.9)Se multilayer structure with the QDs embedded, the IV-VI system nominally consisted of [111] PbSe islands. The comparison of photoluminescence (PL) spectra from the CdSe/(Mn0.1Zn0.9)Se structure with those of a reference structure, that was grown to the same nominal specification under otherwise identical conditions except that no Mn was incorporated into the cladding layers, revealed for the former sample two peaks at approximately 2 and 2.1 eV. We tentatively attribute these two PL peaks to two groups of atomically ordered entities.

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References

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