Photocathode

Définitions de « photocathode »

Photocathode - Nom commun

• (Physique) Matériau émettant des électrons lorsqu'il est exposé à un rayonnement.

  La photocathode, ce matériau qui, sous l'effet de rayonnement, libère des électrons, est la pierre angulaire de nombreux dispositifs optoélectroniques.

Étymologie de « photocathode »

Évolution historique de l’usage du mot « photocathode » depuis 1800

Citations contenant le mot « photocathode »

• La production directe d’hydrogène stockable via panneaux solaire et photocathode monolithique immergée en milieu aqueux : à la lumière solaire l’hydrogène se forme sur la face avant et de l’oxygène sur la face arrière et ce avec un rendement actuel autour de 23%

• Le générateur de gaz utilisé par l’équipe de chercheurs est un dispositif PEC tandem de type pérovskite –BiVO4 autonome constitué d’une photoanode composée de Co WOC et BiVO4 et d’une photocathode en pérovskite chargée de réduire le CO2 en CO. La structure interne, quant à elle, est une succession de matériaux dont la liste complète est disponible à la figure 1 de la publication originale.

• The team made their photocathode from an ultrathin film of the alkali antimonide Cs3Sb. Alkali antimonide materials have been used for decades in technologies including streak cameras and linear colliders. Researchers have also created photocathodes using alkali antimonides. But they found that surface disorder in films of the material can weaken the brightness of the resulting electron beam. The Cornell team shows that it can fix that performance problem by controlling the orientation of Cs3Sb’s atoms.

• Crespo-Quesada, M. et al. Metal-encapsulated organolead halide perovskite photocathode for solar-driven hydrogen evolution in water. Nat. Commun. 7, 6–12 (2016).

• Researchers at the Newman Lab are currently experimenting on different photocathode materials and their degradation to improve their durability in harsh environments. In doing so, they will better understand phenomena, such as ion back bombardments, that only run at high currents.

• Photo electron Soul Inc. PeS is a startup from the Nagoya University based on technology developed over more than 30 years and the world’s only company that owns the “semiconductor photocathode technology” to generate e-beams. PeS will drive great innovation in a wide range of industries covering electronic devices, manufacturing processes, and life sciences, by creating products and services combining a variety of technologies with the e-beam technology developed in academia over many years at its core. https://photoelectronsoul.com/en/  

• The basic concept for laser-illuminated viewing and ranging (LIVAR) has been around since the development of the laser. But a recent range-gated, laser-illuminated, two-dimensional imaging system developed at Intevac operates at novel "eye-safe" wavelengths. The system is based on a transferred electron (TE) photocathode that allows operation in the 1500- to 1600-nm band where the eye's tolerance to high intensity illumination is substantially greater than at shorter wavelengths where traditional photocathodes have sensitivity.

Traductions du mot « photocathode »

Sources et ressources complémentaires

• Définitions du Wiktionnaire
• Définitions du TLFi