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Quantum confinement effects in Ge nanocrystals

Quantum confinement effects in Ge nanocrystals

The exciton Bohr radius of bulk Ge is larger than that of Si, hence resulting more prominent quantum size effects. In this work, the electron structure of Ge nanocrystals is studied by means a sp³s* tight binding approximation. Comparing the theoretical calculations with experimental data, we conclu...

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Bibliographic Details
Main Authors: Miranda, A., Ramos, A.E., Nino de Rivera, L., Cruz-Irisson, M.
Format: Article
Language:English
Published: НТК «Інститут монокристалів» НАН України 2005
Series:Functional Materials
Online Access:http://dspace.nbuv.gov.ua/handle/123456789/138881
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Summary:The exciton Bohr radius of bulk Ge is larger than that of Si, hence resulting more prominent quantum size effects. In this work, the electron structure of Ge nanocrystals is studied by means a sp³s* tight binding approximation. Comparing the theoretical calculations with experimental data, we conclude that, similar to the case of silicon, the blue-green photoluminescence of Ge nanocrystals probably comes from surface and the size dependent photoluminescence in the near infrared probably involves a deep trap in the gap of the nanocrystals.

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