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Latest Carrier generation and recombination Stories

2014-07-09 11:45:12

University of California - Riverside UC Riverside chemists' work on 'singlet fission' can increase solar cell efficiency by as much as 30 percent A perspective article published last month by University of California, Riverside chemists in the Journal of Physical Chemistry Letters was selected as an Editors Choice—an honor only a handful of research papers receive. The perspective reviews the chemists' work on "singlet fission," a process in which a single photon generates a pair of...

Building A High Power LED That Remains Efficient: Study
2014-04-04 15:51:32

Brett Smith for redOrbit.com - Your Universe Online At low power, commonly used LEDs are very efficient. However, when these same LEDs receive enough power to light a room, they lose a significant amount of efficiency, a term referred to as the “green gap” because the efficiency loss is most pronounced with green LEDs. According to a new online report published in Nano Letters, two engineers from the University of Michigan have modeled nanostructures with less width than a DNA...

Physicists Discover 'Quantum Droplet' In Semiconductor
2014-02-27 14:31:14

National Institute of Standards and Technology (NIST) JILA physicists used an ultrafast laser and help from German theorists to discover a new semiconductor quasiparticle—a handful of smaller particles that briefly condense into a liquid-like droplet. Quasiparticles are composites of smaller particles that can be created inside solid materials and act together in a predictable way. A simple example is the exciton, a pairing, due to electrostatic forces, of an electron and a so-called...

2013-07-31 10:42:29

Rensselaer Polytechnic Institute researchers have identified the mechanism behind a plague of LED light bulbs: a flaw called “efficiency droop” that causes LEDs to lose up to 20 percent of their efficiency as they are subjected to greater electrical currents. Efficiency droop, first reported in 1999, has been a key obstacle in the development of LED lighting for situations, like household lighting, that call for economical sources of versatile and bright...

LED Droop Mystery Solved
2013-04-23 15:06:26

Lee Rannals for redOrbit.com - Your Universe Online Researchers have identified what causes light emitting diodes (LEDs) to be less efficient at high drive currents, opening up the door for the energy efficient lighting alternative to be better implemented. Previously, scientists had only theorized about the cause behind LED "droop," which refers to a mysterious drop in the amount of light produced when a higher current is applied to the lights. This phenomenon has helped hold LED...

Multi-Junction Solar Cell To Break Efficiency Barrier Designed By NRL
2013-01-14 11:50:25

U.S. Naval Research Laboratory U.S. Naval Research Laboratory scientists in the Electronics Technology and Science Division, in collaboration with the Imperial College London and MicroLink Devices, Inc., Niles, Ill., have proposed a novel triple-junction solar cell with the potential to break the 50 percent conversion efficiency barrier, which is the current goal in multi-junction photovoltaic development. "This research has produced a novel, realistically achievable, lattice-matched,...

2012-10-31 11:18:16

Hydrogen production by solar water splitting in photoelectrochemical cells (PEC) has long been considered the holy grail of sustainable energy research. Iron oxide is a promising electrode material. An international team of researchers led by Empa, the Swiss Federal Laboratories for Materials Science and Technology, have now gained in-depth insights into the electronic structure of an iron oxide electrode — while it was in operation. This opens up new possibilities for an affordable...

Avoiding Traps In Plastic Electronics
2012-07-30 09:01:59

Plastic electronics hold the promise of cheap, mass-produced devices. But plastic semiconductors have an important flaw: the electronic current is influenced by "charge traps" in the material. These traps, which have a negative impact on plastic light-emitting diodes and solar cells, are poorly understood. However, a new study by a team of researchers from the University of Groningen and the Georgia Institute of Technology reveals a common mechanism underlying these traps and provides a...

2011-04-19 23:02:37

Researchers at the University of California, Santa Barbara, say they've figured out the cause of a problem that's made light-emitting diodes (LEDs) impractical for general lighting purposes. Their work will help engineers develop a new generation of high-performance, energy-efficient lighting that could replace incandescent and fluorescent bulbs. "Identifying the root cause of the problem is an indispensable first step toward devising solutions," says Chris Van de Walle, a professor in the...

2011-04-08 09:00:00

MEDFORD and SOMERVILLE, Mass., April 8, 2011 /PRNewswire-USNewswire/ -- Assistant Professor of Electrical and Computer Engineering Tom Vandervelde has been awarded an early-career award from the National Science Foundation for promising research on the conversion of heat to electricity. Vandervelde, the John A. and Dorothy Adams Faculty Development Professor, will use the $400,000, five year award to continue his studies in thermophotovoltaics (TPVs) -- cells that convert thermal energy,...


Word of the Day
humgruffin
  • A terrible or repulsive person.
Regarding the etymology of 'humgruffin,' the OED says (rather unhelpfully) that it's a 'made-up word.' We might guess that 'hum' comes from 'humbug' or possibly 'hum' meaning 'a disagreeable smell,' while 'gruffin' could be a combination of 'gruff' and 'griffin.'