Results 251 to 260 of about 7,150 (272)

Functionalization of Droplet Etching for Quantum Rings

2018
We give an overview on various types of strain-free semiconductor quantum ring (QR) structures created in a self-assembled fashion with the local droplet etching (LDE) method. LDE is fully compatible with conventional molecular beam epitaxy (MBE) and utilizes liquid Ga or Al droplets which drill nanoholes into semiconductor surfaces.
Christian Heyn, Michael Zocher, Wolfgang Hansen   +2 more
openaire   +1 more source

Sizing Nanoparticle-Covered Droplets by Extrusion through Track-Etch Membranes

Langmuir, 2007
Interfacial segregation of nanoparticles on droplets, such as water droplets in oil, is achieved by mixing or shaking organic solutions of the nanoparticles with water. This typically results in the formation of droplets with a large distribution of sizes, ranging from 10 microm to greater than 200 microm in diameter.
Tangirala, R, Revanur, R, Russell, TP, Emrick, T   +3 more
openaire   +2 more sources

Nanohole formation on AlGaAs surfaces by local droplet etching with gallium

Journal of Crystal Growth, 2009
; A1. Atomic force microscopy ; A1. Diffusion ; A1. Low-dimensional structures ; A3. Molecular beam epitaxy ; B2. Semiconducting III-V materials We demonstrate the self-assembled generation of nanoholes on AlGaAs surfaces by local droplet etching (LDE).
Ch. Heyn, A. Stemmann, W. Hansen
openaire   +1 more source

XPS depth profiling of polystyrene etched by electrospray droplet impact

Surface and Interface Analysis, 2010
Abstract The molecular‐level depth profiling of polystyrene (PS) has been performed by using a newly designed electrospray droplet impact (EDI) gun. The multiple charged water droplets with kinetic energy of ∼10 6 eV were irradiated to a bulk and a spin‐coated PS.
Yuji Sakai, Yoshitoki Iijima, Daiki Asakawa, Kenzo Hiraoka   +3 more
openaire   +1 more source

Local etching of nanoholes and quantum rings with InxGa1−x droplets

Journal of Applied Physics, 2009
We study the formation of nanoholes and quantum rings in GaAs and AlGaAs surfaces by local droplet etching with InxGa1−x. The rings are crystallized from droplet material and surround the nanohole openings. In particular, the influence of the In content x on density, diameter, and depth of the nanoholes is investigated.
A. Stemmann, T. Köppen, M. Grave, S. Wildfang, S. Mendach, W. Hansen, Ch. Heyn   +6 more
openaire   +1 more source

GaAs quantum dot molecules filled into droplet etched nanoholes

Journal of Crystal Growth, 2017
Abstract We fabricate self-aligned vertically stacked GaAs quantum dot molecules (QDMs) by filling of self-assembled nanoholes in AlGaAs. The tunable nanoholes are created using local droplet etching (LDE) combining conventional molecular beam epitaxy with self-assembled, lithography-free patterning. The optical emission from single, strain-free QDMs
Ch. Heyn, A. Küster, A. Gräfenstein, A. Ungeheuer, A. Graf, W. Hansen   +5 more
openaire   +1 more source

Direct Etch Method for Microfluidic Channel and Nano-Height Post Fabrication by Picoliter Droplets

19th IEEE International Conference on Micro Electro Mechanical Systems, 2006
Photolithography is an expensive and significant step in microfabrication. Approaches that could change lithography would create an impact on semiconductor industry and microelectromechanical systems technologies. We demonstrate a direct etching method by ejecting etchant droplets at desired locations by using microdroplet ejector arrays.
Utkan Demirci, Mehmet Toner
openaire   +1 more source

Density limits of high temperature and multiple local droplet etching on AlAs

Journal of Crystal Growth, 2014
Abstract The density of nanoholes created by self-assembled Al droplet etching of AlAs surfaces during molecular beam epitaxy is studied. We find a clear decrease of the hole density with increasing etching temperature T up to a threshold temperature T = 620 ° C . At T > 620 ° C , the hole density saturates at a minimum of 2 ×
J. Kerbst, Ch. Heyn, T. Slobodskyy, W. Hansen   +3 more
openaire   +1 more source

InAs/InP Quantum Dots in etched pits by droplet epitaxy in MOVPE

2020
Preprint of InAs/InP Quantum Dots in etched pits by droplet epitaxy in ...
Sala, Elisa Maddalena, Na, Young In, Godsland, Max, Trapalis, Aristotelis, Heffernan, Jon   +4 more
openaire   +1 more source

Droplet etching during semiconductor epitaxy for single and coupled quantum structures

Quantum Dots and Nanostructures: Growth, Characterization, and Modeling XV, 2018
We give an overview on the present status of self-assembled quantum structure fabrication by using the local droplet etching (LDE) technique during semiconductor molecular-beam epitaxy (MBE). LDE functionalizes nanodroplets to drill spatially well separated nanoholes into semiconductor surfaces.
Wolfgang Hansen, Achim Küster, Michael Zocher, Christian Heyn   +3 more
openaire   +1 more source