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Visible cathodoluminescence from mechanically milled germanium

TitoloVisible cathodoluminescence from mechanically milled germanium
Tipo di pubblicazioneArticolo su Rivista peer-reviewed
Anno di Pubblicazione2002
AutoriNogales, E., Montone Amelia, Cardellini F., Méndez B., and Piqueras J.
RivistaSemiconductor Science and Technology
Volume17
Paginazione1267-1271
ISSN02681242
Parole chiaveBall milling, Band structure, Cathodoluminescence, Crystallites, Nanostructured materials, Oxides, Particles (particulate matter), Powders, Scanning electron microscopy, Semiconducting germanium, Single crystals, Transmission electron microscopy, X ray diffraction
Abstract

There has been interest in the past years in the visible luminescence properties of germanium nanocrystals. Most of the previous works refer to Ge nanocrystals embedded in an oxide matrix. In this work nanocrystalline germanium has been prepared by high-energy ball milling of Ge single crystals and Ge powder. The structure of the milled samples has been assessed by x-ray diffraction (XRD) and transmission electron microscopy (TEM) while the luminescence has been investigated by cathodoluminescence (CL) in the scanning electron microscope (SEM). The samples consist of a powder of particles with sizes of hundreds of nanometres, normally aggregated to form larger panicles. TEM reveals that the particles consist of nanocrystals with a wide range of sizes including crystallites of some nanometres. Milled Ge shows two CL bands at about 2.4-2.5 eV and 3.1 eV, respectively. Both emissions appear to be related to the presence of Ge nanocrystals. The CL of untreated and milled GeO2 powder has been also investigated for comparison.

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URLhttps://www.scopus.com/inward/record.uri?eid=2-s2.0-0036905645&doi=10.1088%2f0268-1242%2f17%2f12%2f310&partnerID=40&md5=5cb0332be71d83bef19067415956710e
DOI10.1088/0268-1242/17/12/310
Citation KeyNogales20021267