Optical properties of Stranski-Krastanov grown three-dimensional Si/Si 1-xGex nanostructures

Document Type

Conference Proceeding

Publication Date

2-1-2005

Abstract

Detailed Raman and photoluminescence (PL) measurements are reported for Si/Si1-xGex nanostructures grown by molecular beam epitaxy under near Stranski-Krastanov (S-K) growth mode conditions. In samples with x ranging from 0.096 to 0.53, we observe that an increase in the Raman signal related to Ge-Ge vibrations correlates with (i) a red shift in the PL peak position, (ii) an increase in the activation energy of PL thermal quenching, and (iii) an increase in the PL quantum efficiency. The results indicate that for x>0.5 Ge atoms form nanometer size clusters with a nearly pure Ge core surrounded by a SiGe shell. Time-resolved PL measurements reveal a stretched-exponential long-lived PL component that is associated with compositional and dimensional fluctuations in the SiGe dots. © 2004 Elsevier B.V. All rights reserved.

Identifier

13544263324 (Scopus)

Publication Title

Physica E Low Dimensional Systems and Nanostructures

External Full Text Location

https://doi.org/10.1016/j.physe.2004.08.047

ISSN

13869477

First Page

174

Last Page

179

Issue

1-4

Volume

26

Fund Ref

National Science Foundation

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