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TitleShadowed off-axis production of Ge nanoparticles in Ar gas atmosphere by pulsed laser deposition : morphological, structural and charge trapping properties
Author(s)Martín-Sánchez, J.
Capan, I.
Chahboun, A.
Pinto, S. R. C.
Vieira, E. M. F.
Rolo, Anabela G.
Gomes, M. J. M.
Pulsed laser deposition
Charge trapping
Issue date18-May-2013
JournalApplied Surface Science
CitationApplied Surface Science 280 (2013) 632– 640
Abstract(s)In this work, a novel customized shadowed off-axis deposition set-up is used to perform an original study of Ge nanoparticles (NPs) formation in an inert Ar gas atmosphere by pulsed laser deposition at room temperature varying systematically the background Ar gas pressure (Pbase(Ar)), target–substrate distance (d) and laser repetition rate (f). The influence of these parameters on the final NPs size distributions is investigated and a fairly uniform droplets-free and non-agglomerated NPs distribution with average height〈h〉= 2.8 ± 0.6 nm is obtained for optimized experimental conditions (Pbase(Ar) = 1 mbar; d = 3 cm; f = 10 Hz) with a fine control in the NPs density (from 3.2 × 10^9 cm^−2 to 1.1 × 10^11 cm^−2). The crystalline quality of as-deposited NPs investigations demonstrate a strong dependence with the Ar gas pressure and a crystalline to amorphous phase volume fraction χc > 50% is found for Pbase(Ar) = 2 mbar. The NPs functionality for charge trapping applications has been successfully demonstrated by capacitance–voltage (C–V) electrical measurements.
DescriptionThe authors would like to thank A. Tarazaga for scientific discussion and José António Santos for technical support.
Publisher version
AccessRestricted access (UMinho)
Appears in Collections:CDF - CEP - Artigos/Papers (with refereeing)

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