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Influence of annealing on structural and optical properties of Germanium quantum dots

Samavati, Alireza and Ghoshal, Sib Krishna and Othaman, Zulkafli (2012) Influence of annealing on structural and optical properties of Germanium quantum dots. Journal of Ovonic Research, 8 (2). pp. 21-27. ISSN 1842-2403

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Official URL: http://www.chalcogen.ro/21_Samavati.pdf


Ge nanodots are grown on a Si(100) substrate by radio frequency magnetron sputtering deposition technique. The role of anneali ng temperature on structural and optical properties is studied. The formation of nanodots is confirmed by X-ray diffraction pattern and the particle size is estimated to be ~ 6.5 to 8.5 nm. The structure and optical characterizations are made using, Energy dispersive X-ray diffraction, field emission scanning electron microscopy, atomic force microscopy, photoluminescence and Raman spectroscopy. The interface intermixing and the size of the nanodots are determined from Raman spectra and field emission scanning electron micrograph. Root mean square roughness and number density are found to be strongly influenced by annealing temperature. Photoluminescence spectra show s the strong emission peak at 3.21 eV accompanied by two weaker peaks at around 2.85 and 4.13 eV in the visible region. The red shift of the strong peak ~ 0.05 eV is attributed to the effect of quantum confinement.

Item Type:Article
Uncontrolled Keywords:Quantum dot, Photoluminescence, Raman spectroscopy, Semiconductor
Subjects:Q Science > QC Physics
ID Code:32830
Deposited By: Fazli Masari
Deposited On:15 Jul 2013 08:30
Last Modified:29 Jan 2019 06:01

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