131 citations · 1.9k across the 71 of their papers we have counts for
74 papers
Two-step growth of (In,Ga)N pseudo-substrates on GaN templates by plasma-assisted molecular beam epitaxy
Huaide Zhang, Jingxuan Kang, Aidan F. Campbell +3
(In,Ga)N layers are grown by plasma-assisted molecular beam epitaxy on GaN templates. We introduce a two-step protocol that involves switching the growth conditions from initially…
Simultaneously monitoring Ga adsorption and desorption kinetics on GaN(0001) using four in situ techniques
Huaide Zhang, Philipp John, Jingxuan Kang +3
We present a systematic investigation of Ga adsorption and desorption kinetics on the wurtzite GaN(0001) surface using four in situ techniques operated simultaneously: reflection h…
Molecular Beam Epitaxy of AlScN Nanowires: Towards Group-III Nitride Piezoelectric Nanogenerators with Enhanced Response
Adriano Notarangelo, Rudeesun Songmuang, Mostafa Saleh +10
We study the molecular beam epitaxy of self-assembled AlScN nanowires on conductive TiN layers and demonstrate their application in piezoelectric na…
Fabrication of (In,Ga)N pseudo-substrates by a three-step growth protocol without ex-situ processing
Huaide Zhang, Aidan F. Campbell, Jingxuan Kang +3
We fabricate (In,Ga)N pseudo-substrates with a total thickness of ~1 um grown on GaN templates using plasma-assisted molecular beam epitaxy. In a three-step process, we change grow…
Combining metal dewetting and lateral etching for the scalable top-down fabrication of GaN nanowire arrays with independently tunable diameter and spacing
Jingxuan Kang, Rose-Mary Jose, Oliver Brandt +1
The top-down fabrication of nanowires based on patterning via metal dewetting is a cost-effective and scalable approach that is particularly suited for applications requiring large…
Diameter dependence of light absorption in GaAs nanowires evidenced by photoluminescence spectroscopy
Francisca Marín, Ijaas Mohamed, Oliver Brandt +1
Semiconductor nanowires are attractive for photovoltaic applications because light absorption can be enhanced compared to planar layers due to the more complex coupling of light wi…
Growth of compositionally uniform layers with low relaxation degree on GaN by molecular beam epitaxy
Jingxuan Kang, Mikel Gómez Ruiz, Duc Van Dinh +7
500-nm-thick layers with 0.05-0.14 are grown using plasma-assisted molecular beam epitaxy, and their properties are assessed by a…
Uniform large-area surface patterning achieved by metal dewetting for the top-down fabrication of GaN nanowire ensembles
Jingxuan Kang, Rose-Mary Jose, Miriam Oliva +6
The dewetting of thin Pt films on different surfaces is investigated as a means to provide the patterning for the top-down fabrication of GaN nanowire ensembles. The transformation…
ScN/GaN(): a new platform for the epitaxy of twin-free metal-semiconductor heterostructures
Philipp John, Achim Trampert, Duc Van Dinh +6
We study the molecular beam epitaxy of rock-salt ScN on the wurtzite GaN() surface. To this end, ScN is grown on free-standing GaN() substrates and self-ass…
Monitoring the formation of nanowires by line-of-sight quadrupole mass spectrometry: a comprehensive description of the temporal evolution of GaN nanowire ensembles
Sergio Fernández-Garrido, Johannes K. Zettler, Lutz Geelhaar +1
We use line-of-sight quadrupole mass spectrometry to monitor the spontaneous formation of GaN nanowires on Si during molecular beam epitaxy. We find that the temporal evolution of…
Self-regulated radius of spontaneously formed GaN nanowires in molecular beam epitaxy
Sergio Fernández-Garrido, Vladimir M. Kaganer, Karl K. Sabelfeld +5
We investigate the axial and radial growth of GaN nanowires upon a variation of the Ga flux during molecular beam epitaxial growth. An increase in the Ga flux promotes radial growt…
Spontaneous nucleation and growth of GaN nanowires: Fundamental role of crystal polarity
Sergio Fernández-Garrido, Xiang Kong, Tobias Gotschke +4
We experimentally investigate whether crystal polarity affects the growth of GaN nanowires in plasma-assisted molecular beam epitaxy and whether their formation has to be induced b…
High-temperature growth of GaN nanowires by molecular beam epitaxy: toward the materials quality of bulk GaN
J. K. Zettler, C. Hauswald, P. Corfdir +5
In molecular beam epitaxy, the spontaneous formation of GaN nanowires on Si(111) substrates at elevated temperatures is limited by the long incubation time that precedes nanowire n…
Molecular Beam Epitaxy of GaN Nanowires on Epitaxial Graphene
Sergio Fernández-Garrido, Manfred Ramsteiner, Guanhui Gao +10
We demonstrate an all-epitaxial and scalable growth approach to fabricate single-crystalline GaN nanowires on graphene by plasma-assisted molecular beam epitaxy. As substrate, we e…
Observation of dielectrically confined excitons in ultrathin GaN nanowires up to room temperature
Johannes K. Zettler, Pierre Corfdir, Christian Hauswald +10
The realization of semiconductor structures with stable excitons at room temperature is crucial for the development of excitonics and polaritonics. Quantum confinement has commonly…
Polarity-induced selective area epitaxy of GaN nanowires
Ziani de Souza Schiaber, Gabriele Calabrese, Xiang Kong +6
We present a conceptually novel approach to achieve selective area epitaxy of GaN nanowires. The approach is based on the fact that these nanostructures do not form in plasma-assis…
Composition and optical properties of (In,Ga)As nanowires grown by group-III-assisted molecular beam epitaxy
M Gómez Ruiz, Aron Castro, Jesús Herranz +5
(In,Ga) alloy droplets are used to catalyse the growth of (In,Ga)As nanowires by molecular beam epitaxy on Si(111) substrates. The composition, morphology and optical properties of…
Sequential directional deposition of one-sided (In,Ga)N shells on GaN nanowires by molecular beam epitaxy
David van Treeck, Jonas Lähnemann, Guanhui Gao +3
Capitalizing on the directed nature of the atomic fluxes in molecular beam epitaxy, we propose and demonstrate the sequential directional deposition of lateral (In,Ga)N shells on G…
Growth mechanisms in molecular beam epitaxy for GaN-(In,Ga)N core-shell nanowires emitting in the green spectral range
David van Treeck, Jonas Lähnemann, Oliver Brandt +1
Using molecular beam epitaxy, we demonstrate the growth of (In,Ga)N shells emitting in the green spectral range around very thin (35 nm diameter) GaN core nanowires. These GaN nano…
Growth kinetics and substrate stability during high-temperature molecular beam epitaxy of AlN nanowires
Philipp John, Mikel Gómez Ruiz, Len van Deurzen +5
We study the molecular beam epitaxy of AlN nanowires between 950 and 1215 °C, well above the usual growth temperatures, to identify optimal growth conditions. The nanowires are gro…
Bismuth surfactant-enhanced III-As epitaxy on GaAs(111)A
Ahmed M. Hassanen, Jesus Herranz, Lutz Geelhaar +1
Quantum dot (QD) growth on high () symmetry GaAs{111} surfaces holds promise for efficient entangled photon sources. Unfortunately, homoepitaxy on GaAs{111} surfaces suffer…
Carrier Recombination in Highly Uniform and Phase-Pure GaAs/(Al,Ga)As Core/Shell Nanowire Arrays on Si(111): Mott Transition and Internal Quantum Efficiency
Miriam Oliva, Timur Flissikowski, Michał Góra +7
GaAs-based nanowires are among the most promising candidates for realizing a monolithical integration of III-V optoelectronics on the Si platform. To realize their full potential f…
A route for the top-down fabrication of ordered ultrathin GaN nanowires
Miriam Oliva, Vladimir Kaganer, Maximilian Pudelski +5
Ultrathin GaN nanowires (NWs) are attractive to maximize surface effects and as building block in high-frequency transistors. Here, we introduce a facile route for the top-down fab…
Lattice parameters of ScAlN layers grown on GaN(0001) by plasma-assisted molecular beam epitaxy
Duc V. Dinh, Jonas Lähnemann, Lutz Geelhaar +1
An accurate knowledge of the lattice parameters of the new nitride ScAlN is essential for understanding the elastic and piezoelectric properties of this…