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Structural and optical properties of germanium nanostructures on Si(100) and embedded in high-k oxides

Ray, Samit K and Das, Samaresh and Singha, Raj K and Manna, Santanu and Dhar, Achintya (2011) Structural and optical properties of germanium nanostructures on Si(100) and embedded in high-k oxides. Nanoscale Research Letters, 6 (1). pp. 1-10.

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Official URL: http://www.nanoscalereslett.com/content/6/1/224

Abstract

The structural and optical properties of Ge quantum dots (QDs) grown on Si(001) for mid-infrared photodetector and Ge nanocrystals embedded in oxide matrices for floating gate memory devices are presented. The infrared photoluminescence (PL) signal from Ge islands has been studied at a low temperature. The temperature- and bias-dependent photocurrent spectra of a capped Si/SiGe/Si(001) QDs infrared photodetector device are presented. The properties of Ge nanocrystals of different size and density embedded in high-k matrices grown using radio frequency magnetron sputtering have been studied. Transmission electron micrographs have revealed the formation of isolated spherical Ge nanocrystals in high-k oxide matrix of sizes ranging from 4 to 18 nm. Embedded nanocrystals in high band gap oxides have been found to act as discrete trapping sites for exchanging charge carriers with the conduction channel by direct tunneling that is desired for applications in floating gate memory devices.

Item Type:Article
Subjects:Physical Science > Nanophysics
Physical Science > Nano objects
Material Science > Nanochemistry
Material Science > Nanostructured materials
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:10952
Deposited By:JNCASR
Deposited On:18 Jul 2011 08:52
Last Modified:18 Jul 2011 08:52

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