Related Experiment Video
Updated: Jan 22, 2026
14:05
Retrograde Labeling of Retinal Ganglion Cells by Application of Fluoro-Gold on the Surface of Superior Colliculus
Published on: June 17, 2008
15.9K
Superior Photo-thermionic electron Emission from Illuminated Phosphorene Surface
S Madas1, S K Mishra1,2, S Kahaly3
1ELI-ALPS, ELI-HU Non-Profit Ltd., Dugonics ter 13, Szeged, 6720, Hungary.
Scientific Reports
|July 18, 2019
Summary
Black phosphorene shows potential as an efficient photo-thermionic emitter. Photon irradiation significantly enhances emission flux, with structural anisotropy playing a key role in boosting performance for energy converters.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Quantum Mechanics
Background:
- Black phosphorene, a 2D allotrope of phosphorus, is explored for novel electronic properties.
- Thermionic and photo-thermionic emission are crucial processes in energy conversion technologies.
Purpose of the Study:
- To investigate the potential of black phosphorene as an efficient photo-thermionic emitter.
- To develop a theoretical framework for understanding and enhancing electron emission from phosphorene.
Main Methods:
- Utilizing ab initio quantum simulations (density functional theory) to study phosphorene's band structure.
- Employing semiclassical descriptions for modeling the thermionic and photo-thermionic emission processes.
- Estimating material-specific parameters like Fermi level and work function.
Main Results:
- Established a formalism for calculating thermionic electron emission current from phosphorene.
- Demonstrated substantial enhancement of emission current under photon irradiation.
- Observed photoemission flux dominating thermionic emission, with phosphorene's anisotropy significantly boosting flux.
Conclusions:
- Black phosphorene is a promising material for efficient photo-thermionic emission.
- Photon irradiation and structural anisotropy are key factors for enhancing emission.
- Results suggest potential applications in phosphorene-based thermionic and photo-thermionic energy converters.
Related Concept Videos
02:39Emission Spectra
75.9K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
75.9K
01:24Electron Carriers
91.5K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
91.5K
03:07Electron Affinity
43.1K
The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
43.1K
01:29Positron Emission Tomography
7.0K
Positron emission tomography (PET) is a medical imaging technique involving radiopharmaceuticals — substances that emit short-lived radiation. Although the first PET scanner was introduced in 1961, it took 15 more years before radiopharmaceuticals were combined with the technique and revolutionized its potential.
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
One of the main requirements of a PET scan is a positron-emitting radioisotope, which is produced in a cyclotron and then attached to a substance used by the part of the body...
7.0K
00:54Electron Behavior
107.5K
Overview
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
Electrons Orbit the Nucleus
Electrons are found in specific locations outside of the nucleus. The shell in which an electron resides indicates the general energy level of the electron: those closer to the...
107.5K
01:14Cranial Bones: Superior and Posterior View
5.0K
The superior view of the cranium shows the frontal and paired parietal bones.
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
The frontal bone is the single bone that forms the forehead. At its anterior midline, between the eyebrows, there is a slight depression called the glabella. The frontal bone also forms the supraorbital margin of the orbit. Near the middle of this margin is the supraorbital foramen, the opening that provides passage for a sensory nerve to the forehead. The frontal bone is thickened just above each supraorbital margin,...
5.0K