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Published March 2005 | public
Journal Article

Diamond cubic Sn-rich nanocrystals: synthesis, microstructure and optical properties


Diamond cubic Sn-rich nanocrystals were fabricated with radii less than 20 nm by post-growth annealing at T=750 °C of Sn_xGe_(1-x) alloys grown on Ge(001) by molecular beam epitaxy. The crystal phase of the Sn-rich nanocrystals was determined to be diamond cubic from Fourier transform analysis of high-resolution transmission electron microscopy images. Optical transmittance of these Sn_xGe_(1-x)/Ge (001) films demonstrated changes in optical absorption that can be attributed to absorption from the nanocrystals. The energy bandgap was measured to be 0.45 eV for nanocrystals arrays in Ge with a mean diameter of 32 nm.

Additional Information

© Springer-Verlag 2005. Received: 15 September 2004 / Accepted: 23 November 2004/ Published online: 11 March 2005. This work was supported by the National Science Foundation. One of us (RR) acknowledges support in the form of an Intel fellowship. C.C. Ahn is gratefully acknowledged for illuminating scientific discussions of electron microscopy.

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