title: Bi-modal nanoheteroepitaxy of GaAs on Si by metal organic vapor phase epitaxy.
abstract: Nano-heteroepitaxial growth of GaAs on Si(001) by metal organic vapor phase epitaxy was investigated to study emerging materials phenomena on the nano-scale of III-V/Si interaction. Arrays of Si nano-tips (NTs) embedded in a SiO2matrix were used as substrates. The NTs had top Si openings of 50-90 nm serving as seeds for the selective growth of GaAs nano-crystals (NCs). The structural and morphological properties were investigated by high resolution scanning electron microscopy, atomic force microscopy, electron backscatter diffraction, x-ray diffraction, and high resolution scanning transmission electron microscopy. The GaAs growth led to epitaxial NCs featuring a bi-modal distribution of size and morphology. NCs of small size exhibited high structural quality and well-defined {111}-{100} faceting. Larger clusters had less regular shapes and contained twins. The present work shows that the growth of high quality GaAs NCs on Si NTs is feasible and can provide an alternate way to the integration of compound semiconductors with Si micro- and opto-electronics technology.
authors.affiliation: Laboratory for Solid State Physics, ETH-Zürich, Otto-Stern-Weg 1, CH-8093 Zürich, Switzerland. Electron Microscopy Center, Empa-Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
authors.forename: Ivan
authors.initials: I
authors.lastname: Prieto
authors.forename: Roksolana
authors.initials: R
authors.lastname: Kozak
authors.forename: Oliver
authors.initials: O
authors.lastname: Skibitzki
authors.forename: Marta D
authors.initials: MD
authors.lastname: Rossell
authors.forename: Peter
authors.initials: P
authors.lastname: Zaumseil
authors.forename: Giovanni
authors.initials: G
authors.lastname: Capellini
authors.forename: Emilio
authors.initials: E
authors.lastname: Gini
authors.forename: Karsten
authors.initials: K
authors.lastname: Kunze
authors.forename: Yadira Arroyo
authors.initials: YA
authors.lastname: Rojas Dasilva
authors.forename: Rolf
authors.initials: R
authors.lastname: Erni
authors.forename: Thomas
authors.initials: T
authors.lastname: Schroeder
authors.forename: Hans von
authors.initials: HV
authors.lastname: Känel