Self-assembled nanowires connected to micropads using the nanostencil method

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Gold nanoparticles with a diameter comprised between 4 and 6 nm are stabilized in nanosized pits of well defined depth in highly oriented pyrolytic graphite (HOPG). These pits are produced by creation of artificial defects, followed by etching under a controlled oxygen atmosphere. At low Au coverage, clusters are found on the edges of the hexagonal pits maximizing the contact to dangling bonds on graphite multisteps. Larger coverage results in Au beads of surprisingly well defined shape and with a constant

Different methods to adjust the wetting behavior of surfaces of the UV-curable adhesive NOA81 were investigated and quantitatively characterized by dynamic contact angle measurements with an optical goniometer. A new method to make NOA81 surfaces hydrophobic by mixing an additive in the uncured polymer was presented. The effect was confirmed by surface roughness studies using atomic force microscopy and X-ray photoelectron spectroscopy measurements. The chemical resistance of NOA81 microfluidic channels was

High reflectivity is essential when a metal is used as back contact and reflector in thin-film silicon solar cells. We show that thermal annealing at 150 °C improves the reflectivity of silver films deposited by sputtering at room temperature on nanotextured substrates. The annealing provokes two interlinked effects: rearrangement of the silver layer with a modification of its morphology and an increase of up to 42% in the grain size of the polycrystalline film for the preferential orientation as measured b

Single-layer MoS2 is a newly emerging two-dimensional semiconductor with a potentially wide range of applications in the fields of nanoelectronics and energy harvesting. The fact that it can be exfoliated down to single-layer thickness, makes MoS2 interesting both for practical applications and for fundamental research, where the structure and crystalline order of ultrathin MoS2 will have a strong influence on electronic, mechanical and other properties. Here, we report on the transmission electron microsco

The performances of thin film silicon solar cells are reported for the use of increasingly rough zinc-oxide (ZnO) front electrodes. Experimental results show that textured substrates favor increased light trapping but also the local creation of undesired current drains, degrading the electrical performance of the cells. While an appropriate plasma treatment of the ZnO surface and a high silicon material quality are required to decrease the density of such current drains, doped nano-crystalline silicon oxide

The development of a particular etching recipe involving two sequences of a Deep Reactive Ion Etching followed by an isotropic etching step for the realization of 3D stacked arrays of fins and nanowires on bulk silicon is reported. Such a recipe can be used among the new processes and designs developed to control the shape and formation of such 3D structures. Applications in microelectronics (stacked field effect transistors) and microsystems (arrays of MEMS resonators and photonic structures) are foreseen.

The present review on light emission stimulated by electrons tunneling inelastically through a junction formed by a sample and a tip of a scanning tunneling microscope (STM) focusses on the most relevant results obtained for a variety of systems, including metal surfaces, single molecules on ultrathin dielectric films, and molecules assembled in thin films or in nanostructures on metal surfaces or on dielectric films. The decisive role of the localized surface plasmon for the enhanced luminescence from supp

In this paper we report the first experimental demonstration of Micro-Electro-Mechanical resonator based on a Carbon Nanotube-Array-Suspended-Gate-Field-Effect-Transistor (CNT-SGFET). A dense array of single-walled CNT aligned by ac-dielectrophoresis technique forms the suspended gate electrode of a conventional silicon based FET. Resonance frequency of 120 MHz is reported. An equivalent electrical model has been developed for the resonator.

This paper reports on the memory and memristive effects of Schottky barrier field effect transistors (SBFET) with gate-all-around (GAA) configuration and Si nanowire (SiNW) channel. Similar behavior has also been investigated for SBFETs with poly-Si nanowire (poly-SiNW) channel in back-gate configuration. The memristive devices presented here have the potential of a very high integration density, and they are suitable for hybrid CMOS co-fabrication with a CMOS-compatible process. We show that 2 different re

Flash memories based on nanoparticles (NPs) offer an attractive alternative for performance enhancement and size downscaling of non-volatile memory cells. In these devices, Coulomb blockade and quantized charging effects can be exploited at room temperature for a limited number of addressed NPs [1]. A successful exploitation of these nanoscale effects requires not only knowledge of the NPs properties (size, nature, structure and location) but also a sound understanding of the charge trapping phenomena that

The chapter “Magnetism of low-dimensional metallic structures” reviews experiments on the magnetism of surface-supported low-dimensional structures of 3d metals. Controlling the static and dynamic magnetic behavior of both individual impurities and supported nanostructures on nonmagnetic surfaces represents a fundamental challenge as well as a prerequisite to design magnetic storage and logic devices of novel conception. We describe the governing principles of self-organized growth of metallic nanostructure

Properties of thin films such as the crystallinity of silicon deposited from SiH4 - H-2 discharges are governed by the plasma composition. Therefore, it is crucial to measure the plasma composition in order to understand and optimize the deposition rate, deposition efficiency and material quality of thin film deposition, such as for microcrystalline silicon, which is a key material for silicon thin film photovoltaic solar cells. This task can be performed by using Fourier transform infrared absorption spect

Self-assembled nanowires connected to micropads using the nanostencil method

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Morphology and stability of Au nanoclusters in HOPG nanopits of well-defined depth

Norland optical adhesive (NOA81) microchannels with adjustable wetting behavior and high chemical resistance against a range of mid-infrared-transparent organic solvents

Highly reflective nanotextured sputtered silver back reflector for flexible high-efficiency n–i–p thin-film silicon solar cells

Ripples and Layers in Ultrathin MoS2 Membranes

Low-conductivity doped layers for improved performance of thin film silicon solar cells on highly textured substrate

3D stacked arrays of fins and nanowires on bulk silicon

Luminescence experiments on supported molecules with the scanning tunneling microscope

Tunable Electromechanical Resonator Based On Carbon Nanotube Array Suspended Gate Field Effect Transistor (Cnt-Sgfet)

Memristive Devices Fabricated with Silicon Nanowire Schottky Barrier Transistors

Charging dynamics of localized 2D layers of Si nanocrystals embedded into SiO2 by stencil masked ultra low energy ion implantation process

Magnetism of Low-dimensional Metallic Structures

Plasma diagnostics as a tool for process optimization: the case of microcrystalline silicon deposition