title: Coaxial multishell (In,Ga)As/GaAs nanowires for near-infrared emission on Si substrates.
abstract: Efficient infrared light emitters integrated on the mature Si technology platform could lead to on-chip optical interconnects as deemed necessary for future generations of ultrafast processors as well as to nanoanalytical functionality. Toward this goal, we demonstrate the use of GaAs-based nanowires as building blocks for the emission of light with micrometer wavelength that are monolithically integrated on Si substrates. Free-standing (In,Ga)As/GaAs coaxial multishell nanowires were grown catalyst-free on Si(111) by molecular beam epitaxy. The emission properties of single radial quantum wells were studied by cathodoluminescence spectroscopy and correlated with the growth kinetics. Controlling the surface diffusivity of In adatoms along the NW side-walls, we improved the spatial homogeneity of the chemical composition along the nanowire axis and thus obtained a narrow emission spectrum. Finally, we fabricated a light-emitting diode consisting of approximately 10(5) nanowires contacted in parallel through the Si substrate. Room-temperature electroluminescence at 985 nm was demonstrated, proving the great potential of this technology.
authors.affiliation: Paul-Drude-Institut für Festkörperelektronik , Hausvogteiplatz 5-7, 10117 Berlin, Germany.
authors.forename: Emmanouil
authors.initials: E
authors.lastname: Dimakis
authors.forename: Uwe
authors.initials: U
authors.lastname: Jahn
authors.forename: Manfred
authors.initials: M
authors.lastname: Ramsteiner
authors.forename: Abbes
authors.initials: A
authors.lastname: Tahraoui
authors.forename: Javier
authors.initials: J
authors.lastname: Grandal
authors.forename: Xiang
authors.initials: X
authors.lastname: Kong
authors.forename: Oliver
authors.initials: O
authors.lastname: Marquardt
authors.forename: Achim
authors.initials: A
authors.lastname: Trampert
authors.forename: Henning
authors.initials: H
authors.lastname: Riechert
authors.forename: Lutz
authors.initials: L
authors.lastname: Geelhaar