Crystal Research and Technology
Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor: Wolfgang Neumann (Editor-in-Chief), Klaus-W. Benz (Consulting Editor)
Online ISSN: 1521-4079
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Recently Published Articles
- Selective growth of InAs quantum dots on GaAs driven by as kinetics
R. Magri, E. Placidi, F. Arciprete and F. Patella
Article first published online: 22 JUL 2014 | DOI: 10.1002/crat.201300426
In ACS Nano 7, 3868 (2013) we showed a selective growth of InAs Quantum Dots entirely due to the As component, usually believed having a minor role in the dot growth. In this paper we examine how the As flux direction and intensity influences the selective growth of InAs quantum dots and, through experiment and rate equations, find that the effect originates only from the small As flux gradient between the mound slopes and is not influenced substantially by the flux intensity.
- Properties of ZnO nanorods grown by hydrothermal synthesis on conductive layers
L.V. Podrezova, V. Cauda, S. Stassi, G. Cicero, Kh. A. Abdullin and B. E. Alpysbaeva
Article first published online: 9 JUL 2014 | DOI: 10.1002/crat.201300372
Zinc oxide nanorods were hydrothermally grown from water solution on different conductive substrates. In particular, several metal layers, such as Cu, Ni, Pt, Ag, Au, deposited on silicon substrates, and F-doped SnO2 coated-glass wafers were investigated as bottom electrodes and their influence on the properties of the synthesized nanorods were studied. The samples were characterized by scanning electron microscopy, X-ray diffraction, atomic force microscopy, current - voltage and photoluminescence measurements.
- Controllable vapor phase growth of vertically aligned ZnO nanorods on TCO/Glass substrates
Sathish Chander Dhanabalan, John Paul Garcia, Davide Calestani, Francesco Pattini, F. Bissoli, Marco Villani, Stefano Rampino and Andrea Zappettini
Article first published online: 3 JUL 2014 | DOI: 10.1002/crat.201300422
Solution-free and catalyst-free vertically aligned ZnO nanorods have been synthesized by thermal CVD reactor at relatively low temperature (< 500°C) to produce high-surface 3D photoanode on glass substrate. The study revealed that size and orientation of ZnO nanorods are mainly related to TCO's grain morphology and crystallinity, while their length can be controlled by varying Zn evaporation parameters.
- Scanning transmission electron microscopy measurement of bismuth segregation in thin Ga(As,Bi) layers grown by molecular beam epitaxy
Thomas Walther, Robert D. Richards and Faebian Bastiman
Article first published online: 3 JUL 2014 | DOI: 10.1002/crat.201400157
Annular dark-field imaging in a scanning transmission electron microscope has been used to measure concentration profiles across thin Ga(As,Bi) layers, from which the segregation lengths for bismuth surface segregation have been calculated. Performing this for layers grown at two different temperatures, the activation energies for bismuth surface segregation have been determined for both interfaces. The upper (GaAs-on-GaAsBi) interface is wider but exhibits slightly higher activation energy for surface segregation.
- Centrifugal separation of primary silicon crystal in solvent refining of silicon using Al-30% Si alloy
Ki Young Kim, Je Beom Jeon and Jong Sik Shin
Article first published online: 2 JUL 2014 | DOI: 10.1002/crat.201400074
This study describes the formation of primary silicon network during centrifugal separation of an Al – 30% Si melt and the process conditions to make bigger pure primary silicon crystals for solar use. This centrifugal method does not use the density difference between two phases, as in conventional methods, but instead uses the order of solidification in Al-Si alloys. The size of primary silicon is important in this centrifugal separation method.