Cathodoluminescence from nanocrystals in mechanically milled silicon



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Díaz-Guerra Viejo, Carlos and Montone, A. and Piqueras de Noriega, Javier and 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

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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.

Item Type:Article
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International Workshop on Bean Injection Assessment of Microstructures in Semiconductors (6. 2000. Fukuoka, Japón).

Uncontrolled Keywords:Oxidized Porous Silicon, Visible Photoluminescence, Luminescence Properties, Optical-Properties, Si, Films, States
Subjects:Sciences > Physics > Materials
ID Code:26363
Deposited On:25 Jul 2014 12:11
Last Modified:25 Jul 2014 12:11

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