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Cathodoluminescence from nanocrystals in mechanically milled silicon



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Díaz-Guerra Viejo, Carlos y Montone, A. y Piqueras de Noriega, Javier y Cardellini, F. (2000) Cathodoluminescence from nanocrystals in mechanically milled silicon. Beam Injection Assessment of Microestructures in Semiconductors, 20, 78-79 . pp. 103-109. ISSN 1012-0394

URL Oficial: http://dx.doi.org/10.4028/www.scientific.net/SSP.78-79.103

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Mechanical milling is a technique extensively used to prepare nanocrystalline metallic materials but it has been less frequently applied to semiconductors. The preparation of nanocrystalline silicon by different methods is a subject of increasing interest due to the luminescent properties of this material and its possible application in optoelectronic devices. In this work high-energy ball milling has been used to prepare nanocrystals from single crystalline silicon wafers. The structure of the milled samples has been assessed by X-ray diffraction, transmission electron microscopy (TEM) and Raman spectroscopy, while their 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 nanometers aggregated to form bigger particles of several microns. TEM reveals that the particles consist of nanocrystals with a wide range of sizes including crystallites with dimension of few nanometers. CL spectra of the milled samples show a band at 1.61 eV, attributed to the presence of nanocrystals through a quantum confinement effect. It is suggested that a milling induced infrared emission is related to a high density of extended defects present in the milled samples.

Tipo de documento:Artículo
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© scientific.net.
International Workshop on Bean Injection Assessment of Microstructures in Semiconductors (6. 2000. Fukuoka, Japón).

Palabras clave:Oxidized Porous Silicon, Visible Photoluminescence, Luminescence Properties, Optical-Properties, Si, Films, States
Materias:Ciencias > Física > Física de materiales
Código ID:26363
Depositado:25 Jul 2014 12:11
Última Modificación:25 Jul 2014 12:11

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