Concept

Germanium

Publications associées (85)

Stability of valence alternation pairs across the substoichiometric region at Ge/GeO2 interfaces

Alfredo Pasquarello, Peter Broqvist, Jan Felix Binder

Through hybrid density functional calculations, we compare the Ge-Ge bond energy with the formation energy of a valence alternation pair as the O concentration varies across the Ge/GeO2 interface. First, hole trapping energies are calculated for three atom ...

2012

Advantages of highly ionized pulse plasma magnetron sputtering (HIPIMS) of silver for improved E-coli inactivation

César Pulgarin, Juan Kiwi, Rosendo Sanjines, Oualid Baghriche

This study addresses the DC-magnetron sputtering (DCMS) of Ag-films on polyester and compares the results found for the E. coli inactivation with the inactivation obtained when applying highly ionized pulse plasma power magnetron sputtering (HIPIMS). The a ...

Elsevier2012

Solid solubility of germanium in silver

Ludger Weber, Hamed Kazemi

The solid solubility of germanium in silver has been measured in the temperature range of 520 K to 913 K via measurements of density and of electrical conductivity of two near-eutectic Ag-Ge alloys. The atomic fraction of germanium in solid solution varied ...

Elsevier2012

Microstructure and thermoelectric properties of bulk and porous n-type silicon-germanium alloy prepared by HUP

Cyril Cayron

The optimization of powders preparation and consolidation process leads to the achievement of a high thermoelectric figure of merit (ZT=1.25 at 800°C) in an n-type silicon-germanium (SiGe) alloy hot pressed at low heating rate. It has been experimentally o ...

2012

Curvature effects on valley splitting and degeneracy lifting: Case of Si/Ge rolled-up nanotubes

Giovanni Pizzi

We numerically investigate electronic states, degeneracy lifting, and valley splitting in the conduction band of rolled-up Si/Ge nanotubes. Results are derived from a tight-binding model where the input equilibrium positions of the atoms are obtained by me ...

2012

Zinc Oxide Nanowires Deposited on Polymeric Hotplates for Low-power Gas Sensors

Nico de Rooij, Danick Briand, Jérôme Courbat

Zinc oxides (ZnO) nanowires were successfully deposited on plastic low-power micro-hotplates using the thermal oxidation technique. Metallic zinc layer was deposited on the sensing transducer by RF magnetron sputtering and then oxidized in a controlled atm ...

2012

A Ge-on-Si single-photon avalanche diode operating in Geiger mode at infrared wavelengths

Edoardo Charbon, Mahdi Aminian, Lin Qi

The Ge APD detectors are fabricated on Si by using a selective chemical-vapor deposition (CVD) epitaxial growth technique. A novel processing procedure was developed for the p+ Ge surface doping by a sequence of pure-Ga and pure-B depositions (PureGaB). Th ...

Spie-Int Soc Optical Engineering, Po Box 10, Bellingham, Wa 98227-0010 Usa2012

Electronic structure of Zn, Cu and Ni impurities in germanium

Alexandra Sarabando de Carvalho

We present a density functional modelling study of Zn, Cu and Ni impurities in hydrogen-terminated germanium clusters. Their electronic structure is investigated in detail, especially their Jahn-Teller instabilities and electrical levels. Interstitial and ...

2011

Role of Disorder and Anharmonicity in the Thermal Conductivity of Silicon-Germanium Alloys: A First-Principles Study

Nicola Marzari, Boris Kozinsky

The thermal conductivity of disordered silicon-germanium alloys is computed from density-functional perturbation theory and with relaxation times that include both harmonic and anharmonic scattering terms. We show that this approach yields an excellent agr ...

2011

High Thermal Conductivity in Short-Period Superlattices

Nicola Marzari

The thermal conductivity of ideal short-period superlattices is computed using harmonic and anharmonic force constants derived from density-functional perturbation theory and by solving the Boltzmann transport equation in the single-mode relaxation time ap ...

2011

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