CUED Publications database

Shape-selective synthesis of II-VI semiconductor nanowires

Fasoli, A and Colli, A and Hofmann, S and Ducati, C and Robertson, J and Ferrari, AC (2006) Shape-selective synthesis of II-VI semiconductor nanowires. Physica Status Solidi B-Basic Solid State Physics, 243. pp. 3301-3305. ISSN 0370-1972

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Polar II-VI semiconductors can nucleate in complex shapes ranging from nanowires to nanoribbons, nanosaws and multipods. Here we demonstrate the deterministic and fully reproducible shape-selective growth of several morphologies of CdSe and ZnTe nanocrystals by a steady-state vapour transport process. A simple pressure-based precursor-flow shutter excludes any effects of temperature ramping, ensuring reproducible shape selectivity for each set of deposition parameters. Once thermal gradients are eliminated, we show that the transition from one nanocrystal shape to another is controlled just by the interplay of precursor impinging on the substrate (ruled by the powder temperature T-P) and sample surface kinetics (ruled by the sample temperature T-S). Furthermore, a regime is found where seeded, epitaxial growth of CdSe nanorods becomes dominant over the conventional catalyst-assisted nucleation. This allows the fabrication of vertical nanorod arrays free of any metal contamination. Seeded growth of branched and tetrapod-like nanocrystals is also possible by further optimisation of the growth parameters. (c) 2006 WILEYNCH Verlag GmbH & Co. KGaA, Weinheim.

Item Type: Article
Uncontrolled Keywords: nanosaws
Divisions: Div B > Solid State Electronics and Nanoscale Science
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:33
Last Modified: 23 Nov 2017 04:20