Results 251 to 260 of about 23,382 (292)

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

Alloying during local droplet etching of AlGaAs surfaces with aluminium

Journal of Applied Physics, 2019
Local droplet etching (LDE) drills self-assembled nanoholes into AlGaAs surfaces and represents a powerful technique for the fabrication of versatile quantum structures like quantum dots, rings, and molecules. Usually, LDE is performed at temperatures T=600−680°C if Al is used as the etching material.
M. Zocher, Ch. Heyn, W. Hansen
openaire   +1 more source

Self-Assembly of Semiconductor Quantum Rings by Local Droplet Etching

Journal of Nanoelectronics and Optoelectronics, 2011
We give an overview on the self-assembly and optical properties of strain-free semiconductor quantum rings (QRs) generated by the novel technique local droplet etching (LDE). LDE is fully compatible with conventional molecular beam epitaxy equipment and utilizes liquid metallic droplets which perform a spatially limited drilling and form nanovolcanoes ...
Ch. Heyn, A. Stemmann, Ch. Strelow, T. Köppen, D. Sonnenberg, A. Graf, S. Mendach, W. Hansen   +7 more
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 droplet etching – Nanoholes, quantum dots, and air-gap heterostructures

AIP Conference Proceedings, 2014
Local droplet etching (LDE) allows the self-organized generation of nanoholes in semiconductor surfaces and is fully compatible with molecular beam epitaxy (MBE). The influence of the process parameters as well as of droplet and substrate materials on the LDE nanohole morphology is discussed.
Ch. Heyn, D. Sonnenberg, A. Graf, J. Kerbst, A. Stemmann, W. Hansen   +5 more
openaire   +1 more source

Morphological engineering of aluminum droplet etched nanoholes for symmetric GaAs quantum dot epitaxy

Nanotechnology, 2020
Symmetric droplet-etched quantum dots (QDs) are the leading candidate for generating high-performance polarization-entangled photon pairs. One of the challenges is how to precisely engineer the properties of QDs by controlling the morphology of etched nanoholes.
Xiaoying Huang, Hancheng Zhong, Jiawei Yang, Lin Liu, Jin Liu, Ying Yu, Siyuan Yu   +6 more
openaire   +2 more sources

Fabrication of superhydrophobic aluminum surface by droplet etching and chemical modification

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2019
Abstract The development of techniques to fabricate superhydrophobic aluminum surfaces is rapidly maturing, yet the problems of high loss of material and complex preparation still persist. To address this, a simple method that combines droplet etching and chemical modification was used to fabricate a superhydrophobic aluminum surface, with a contact ...
Xin Zhang, Jing Zhao, Jiliang Mo, Ruoyu Sun, Zhen Li, Zhiguang Guo   +5 more
openaire   +1 more source

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

Dry etching of diamond nanowires using self-organized metal droplet masks

Diamond and Related Materials, 2011
Abstract In a top–down approach diamond nanowires (DNW) were fabricated by anisotropic oxygen plasma etching of undoped or boron doped polycrystalline diamond layers. Dewetting an evaporated metal film, resulting in randomly distributed metal droplets of 5–50 nm in diameter, created the etching mask.
Janssen, Wiebke, Gheeraert, Etienne
openaire   +2 more sources

Droplet etched GaAs quantum dots close to surfaces and metallic interfaces

Journal of Applied Physics, 2017
GaAs quantum dots (QDs) with a thin cap layer are studied as building blocks for self-aligned hybrids with a metallic nanostructure (MN). Both constituents are filled into a nanohole template that is drilled into an AlGaAs surface by self-assembled local droplet etching during molecular beam epitaxy.
Ch. Heyn, M. Zocher, L. Pudewill, H. Runge, A. Küster, W. Hansen   +5 more
openaire   +1 more source