Catalytic growth of ZnTe nanowires by molecular beam epitaxy: structural studies

Abstract

ZnTe nanowires were grown by molecular beam epitaxy on GaAs substrates of three different orientations: (100), (110), and (111)B. The catalyst droplets were produced through in situ annealing of a previously deposited Au layer and by forming the eutectic alloy with Ga from the substrate. The influence of substrate orientation and growth parameters on the properties of nanowires was investigated using scanning and transmission electron microscopy, energy dispersive x-ray spectroscopy, and x-ray diffraction. The growth process was based on the vapour–liquid–solid mechanism and the contribution of the diffusion-induced effect in this mechanism was confirmed by correlating the length and the diameter of the produced nanowires. The nanowires had diameters ranging from 30 to 70 nm and lengths between 1 and 2 µm. The growth axis of the nanowires was and the nanowires grew along directions of the substrate, independent of the substrate orientation used. The nanowires had stacking faults at the bottom and those grown at optimal conditions possessed perfect cubic structure near the top.

Polytypism in ZnS, ZnSe, and ZnTe: First-principles study

“…Colloidal synthesis of polytypic II-VI nanocrystals with ZB cores and epitaxially grown WZ, such as CdSe [4] and CdTe [5] nanocrystals, are the only few examples of controlled polytype engineering in II-VI systems. Moreover, recent experiments show strong evidence of WZ-ZB polytypism in ZnX (X = S, Se, and Te) materials [6][7][8][9][10][11]. The twinned ZnX NWs with the mixed ZB/WZ structures are commonly observed along the [111]/[0001] direction.…”

Structural characterization of the epitaxially grown core–shell ZnTe/ZnMgTe nanowires

“…The results of present measurements confirmed earlier results concerning the ZnTe NWs, namely, that the growth axis of the NWs is of <111> type. The NWs grew along <111> direction of the GaAs substrate, independently on the given substrate orientation (Janik et al, 2007). If the NWs are grown on (111) oriented substrate (our case) they are either perpendicular to the (111) The X-ray diffraction patterns shown in Fig.…”

Magnetic and Structural Study of (ZnTe)/Co Core-Shell Nanowires Grown by Molecular Beam Epitaxy

“…Growth process of long and straight ZnTe NWs was described in detail in Ref. [7]. The deposition of cobalt onto the side walls of NWs was performed in molecular beam epitaxy (MBE) system.…”