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Silicon self-assembled growth of quantum dots grown on corning glass (7059) substrate

Sakrani, Samsudi and Lim, Qiao Jie and Sumpono, Imam (2007) Silicon self-assembled growth of quantum dots grown on corning glass (7059) substrate. Journal of Fundamental Sciences, 3 (1). pp. 158-165. ISSN 1823-626X

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Abstract

Silicon quantum dots have been grown on corning glass(7059) substrate using a self-assembly method of physical vapour deposition. The samples were fabricated at sufficiently low sputtering rate and varying experimental conditions. Apparently, the onset of nucleation took place during the first 5 minutes of deposition, followed by a further growth of stable islands known as quantum dots, with the measured radii comparable to the predicted values. Other measurement results confirmed the existence of these dots, including the bandgap energy ∼ 1.80 eV from PL and a 2% at. silicon from EDX and possible amorphous from XRD. The nucleation parameters were predicted as follows: Free energy change per unit volume ∆Gv = 2.64x104 Jmol-1; Surface energies per unit area, γLN = 1.48 Jm-2, γNS = 20.0 - 90.0 Jm-2 and γLS = 0.42 x 10-2 Jm-2; Critical energies ∆G* = 7.53x10-17 - 8.31x10-14 J; Critical radii r* = 9.0- 97.0 nm. This experimental evidence strongly support the early stage growth model of silicon quantum dot deposited on corning glass substrate

Item Type:Article
Uncontrolled Keywords:corning glass, sputtering rate, bandgap energy, silicon quantum
Subjects:Q Science > Q Science (General)
Divisions:Science
ID Code:8164
Deposited By: Norshiela Buyamin
Deposited On:02 Apr 2009 07:04
Last Modified:15 Jan 2014 08:02

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