Matrix role in Ge nanoclusters embedded in Si

S. Mirabella, S. Cosentino, A. Gentile, G. Nicotra, N. Piluso, L.V. Mercaldo, F. Simone, C. Spinella, A. Terrasi

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Abstract

Ge nanoclusters (NCs), synthesized by ion implantation and annealing up to 900 °C, result small (∼2 nm) and amorphous in Si3N4, crystalline and much larger in SiO2. The NCs ripening and crystallization kinetics in Si3N4is retarded by larger interfacial energy and lower diffusivity of Ge in comparison to SiO2. Ge NCs absorb light more efficiently when embedded in Si3N4than in SiO2. A significant effect of the barrier height on absorption was evidenced, in agreement with effective mass theory predictions. The smaller bandgap of Ge NCs embedded in Si3N4and their closeness is promising features for light harvesting applications. © 2012 American Institute of Physics.
Original languageEnglish
Article number011911
Pages (from-to)-
JournalApplied Physics Letters
Volume101
Issue number1
DOIs
Publication statusPublished - 2 Jul 2012

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Cite this

Mirabella, S., Cosentino, S., Gentile, A., Nicotra, G., Piluso, N., Mercaldo, L. V., Simone, F., Spinella, C., & Terrasi, A. (2012). Matrix role in Ge nanoclusters embedded in Si. Applied Physics Letters, 101(1), -. [011911]. https://doi.org/10.1063/1.4734395