GaSbBi alloys and heterostructures: fabrication and properties

International audienceDilute bismuth (Bi) III-V alloys have recently attracted great attention, due to their properties of band-gap reduction and spin-orbit splitting. The incorporation of Bi into antimonide based III-V semiconductors is very attractive for the development of new optoelectronic devices working in the mid-infrared range (2-5 µm). However, due to its large size, Bi does not readily incorporate into III-V alloys and the epitaxy of III-V dilute bismides is thus very challenging. This book chapter presents the most recent developments in the epitaxy and characterization of GaSbBi alloys and heterostructures

ANNEALING OF HIGH DOSE IMPLANTED GaAs WITH HALOGEN LAMPS

Le recuit de GaAs implanté par un système de deux lampes à halogene est présenté. Le confinement de l'échantillon monté entre une plaque de silicium et une plaque de quartz permet d'obtenir une protection par contact. Cette configuration a permis l'étude par diffusion Raman de la reconstruction du réseau cristallin après irradiation ainsi que la limite de dégradation en surface du substrat par perte d'arsenic.The use of radiation from two halogene lamps to anneal implanted GaAs has been studied. Contact protection of the substrate is obtained by mounting it in a sandwich configuration between a silicon and a quartz plate. This configuration allows to measure by Raman scattering lattice recovery after irradiation and substrate surface degradation due to arsenic loss

SOFT PHONON VALLEY NEAR THE TRANSITION TO AN INCOMMENSURATE PHASE IN BARIUM SODIUM NIOBATE

The dynamic characteristics of the tetragonal to incommensurate transition in Barium Sodium Niobate has been investigated. The precursor effects consist, in the tetragonal phase, of a soft phonon and a central peak

RAMAN VIBRATIONAL STUDIES OF TRANSIENT ANNEALING OF GaAs AMORPHOUS THIN FILMS

Des couches endommagées par implantation ionique, à forte dose, dans GaAs ont été reconstruites à l'aide d'un laser Ruby pulsé (nsec), d'un laser Nd-YAG pulsé (psec) ou d'un système de lampes à halogène. La reconstruction du réseau cristallin par ces différentes techniques de recuit rapide est étudiée par diffusion Raman des phonons.A nanosecond pulsed ruby laser, a picosecond pulsed Nd-YAG laser and a set of halogen lamps are used to induce the reconstruction of the damage layer obtained by high dose ion implantation in single crystal GaAs. The lattice reconstruction by these different rapid irradiation sources has been examined by Raman scattering from the phonons

The Contribution of the Solcon Instrument to the Long Term Total Solar Irradiance Observation

On century time scales, the variation in the total solar irradiance received by the earth is believed to be a major climate change driver. Therefore accurate and time stable measurements of the total solar irradiance are necessary. We present the latest contribution of the SOLar CONstant (SOLCON) instrument to these measurements, namely its measurements during the International Extreme Ultraviolet Hitchhiker (IEH) 3 space shuttle flight, and its results: the verification of the ageing of the Earth Radiation Budget Satellite (ERBS), and the measurement of the Space Absolute Radiometric Reference (SARR) adjustment coefficients for the Variability of solar IRradiance and Gravity Oscillations (VIRGO) radiometers

The Geostationary Earth Radiation Budget Project

This paper reports on a new satellite sensor, the Geostationary Earth Radiation Budget (GERB) experiment. GERB is designed to make the first measurements of the Earth's radiation budget from geostationary orbit. Measurements at high absolute accuracy of the reflected sunlight from the Earth, and the thermal radiation emitted by the Earth are made every 15 min, with a spatial resolution at the subsatellite point of 44.6 km (north–south) by 39.3 km (east–west). With knowledge of the incoming solar constant, this gives the primary forcing and response components of the top-of-atmosphere radiation. The first GERB instrument is an instrument of opportunity on Meteosat-8, a new spin-stabilized spacecraft platform also carrying the Spinning Enhanced Visible and Infrared (SEVIRI) sensor, which is currently positioned over the equator at 3.5°W. This overview of the project includes a description of the instrument design and its preflight and in-flight calibration. An evaluation of the instrument performance after its first year in orbit, including comparisons with data from the Clouds and the Earth's Radiant Energy System (CERES) satellite sensors and with output from numerical models, are also presented. After a brief summary of the data processing system and data products, some of the scientific studies that are being undertaken using these early data are described. This marks the beginning of a decade or more of observations from GERB, as subsequent models will fly on each of the four Meteosat Second Generation satellites