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Au-catalyzed synthesis and characterisation of phase change Ge-doped Sb-Te nanowires by MOCVD (Articolo in rivista)

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Au-catalyzed synthesis and characterisation of phase change Ge-doped Sb-Te nanowires by MOCVD (Articolo in rivista) (literal)

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Longo M. 1, Stoycheva T. 1, Fallica R. 1, Wiemer C. 1, Lazzarini L. 2, Rotunno E. 2 (2013)
Au-catalyzed synthesis and characterisation of phase change Ge-doped Sb-Te nanowires by MOCVD
in Journal of crystal growth; ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS, AMSTERDAM (Paesi Bassi)
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Longo M. 1, Stoycheva T. 1, Fallica R. 1, Wiemer C. 1, Lazzarini L. 2, Rotunno E. 2 (literal)

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1 CNR, IMM, Unita Agrate Brianza, Lab MDM, I-20864 Agrate Brianza, MB, Italy; 2 CNR, IMEM, I-43124 Parma, Italy (literal)

Titolo

Au-catalyzed synthesis and characterisation of phase change Ge-doped Sb-Te nanowires by MOCVD (literal)

Abstract

The interest in the Ge doped Sb-Te chalcogenide alloy is mainly related to phase change memory applications. In view of phase change device scaling and reduction of programming energy, Sb-Te nanowires (NWs) become an attractive option. In this work, in order to investigate their potential transferability to industrial implementation, the self-assembly of Sb2Te3 NWs and Ge-Sb-Te NWs with Ge content in the range of 1-13% (Ge doping) was studied by coupling the advantages of MOCVD and the Vapour-Liquid-Solid (VLS) mechanism. The results show the structural and compositional gradual changes occurring from pure Sb2Te3 NWs to the previously reported, stoichiometric Ge1Sb2Te4 NWs [[12] M. Longo et al., Nano Lett., 12 (2012) 1509]. The typical diameter of the obtained NWs resulted to be 50 nm, with lengths up to 3 mu m. The typology of Au catalyst nanoislands influenced both the NW morphology and the Ge incorporation during the VLS self-assembly; the Ge metalorganic precursor partial pressure affected the NW morphology and their structure. Finally, TEM observations revealed that defect-free, monocrystalline Sb2Te3 and Ge-doped Sb-Te phase change NWs could be obtained. (literal)

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