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Open Access Nano Express

The curious case of exploding quantum dots: anomalous migration and growth behaviors of Ge under Si oxidation

Ching-Chi Wang12, Po-Hsiang Liao12, Ming-Hao Kuo12, Tom George3 and Pei-Wen Li12*

Author affiliations

1 Department of Electrical Engineering, National Central University, Chung-Li 320, Taiwan

2 Center for Nano Science and Technology, National Central University, Chung-Li 320, Taiwan

3 Zyomed Corporation, Altadena, California 91001, USA

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Citation and License

Nanoscale Research Letters 2013, 8:192  doi:10.1186/1556-276X-8-192

Published: 25 April 2013

Abstract

We have previously demonstrated the unique migration behavior of Ge quantum dots (QDs) through Si3N4 layers during high-temperature oxidation. Penetration of these QDs into the underlying Si substrate however, leads to a completely different behavior: the Ge QDs ‘explode,’ regressing back almost to their origins as individual Ge nuclei as formed during the oxidation of the original nanopatterned SiGe structures used for their generation. A kinetics-based model is proposed to explain the anomalous migration behavior and morphology changes of the Ge QDs based on the Si flux generated during the oxidation of Si-containing layers.

Keywords:
Germanium quantum-dot; Migration; Oxidation