Latest Exciton 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...

Laser-like Beams That Use 250x Less Power
2014-06-06 03:56:27

By Nicole Casal Moore, University of Michigan With precarious particles called polaritons that straddle the worlds of light and matter, University of Michigan researchers have demonstrated a new, practical and potentially more efficient way to make a coherent laser-like beam. They have made what's believed to be the first polariton laser that is fueled by electrical current as opposed to light, and also works at room temperature, rather than way below zero. Those attributes make the...

2014-04-17 05:41:28

redOrbit Staff & Wire Reports - Your Universe Online While excitons have been understood in theory for decades, the authors of a new Nature Communications study have directly observed these quasiparticles responsible for energy transfer in solar cells, LEDs and semiconductor circuits for the first time. According to the MIT and City University of New York (CUNY) scientists behind the research, being able to image the motions of the excitons directly could result in significant...

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...

Study Could Lead To Paradigm Shift In Organic Solar Cell Research
2013-11-20 09:56:25

Stanford University Organic solar cells have long been touted as lightweight, low-cost alternatives to rigid solar panels made of silicon. Dramatic improvements in the efficiency of organic photovoltaics have been made in recent years, yet the fundamental question of how these devices convert sunlight into electricity is still hotly debated. Now a Stanford University research team is weighing in on the controversy. Their findings, published in the Nov. 17 issue of the journal Nature...

Harnessing Power By Funneling Solar Energy
2012-11-26 12:53:51

Michael Harper for redOrbit.com — Your Universe Online The concept is a simple one, borrowing from some very elementary principles. For instance, everyone knows the best way to capture and contain the most of an element or substance is with a funnel. These cones make it easier to put oil in our cars or fill small glass shakers from a larger bag of sugar. Now, some MIT engineers have worked out a computational model which shows how solar energy can be more or less funneled...

Organic Solar Cells One Step Closer To Success
2012-06-15 13:24:53

Brett Smith for redOrbit.com Organic solar cells have long been a promising alternative to conventional solar cells, but their low efficiency, low stability, and low strength have kept them from widespread commercial use. Senior chemist Lin Chen of the U.S. Department of Energy´s (DOE) Argonne National Laboratory hopes to change that by focusing on a key component of the cells, the exciton. According to Chen, excitons are considered a sort of “quasiparticle,” because...

2012-05-24 21:01:08

Excitons form Bose-Einstein condensate Physicists have trapped and cooled exotic particles called excitons so effectively that they condensed and cohered to form a giant matter wave. This feat will allow scientists to better study the physical properties of excitons, which exist only fleetingly yet offer promising applications as diverse as efficient harvesting of solar energy and ultrafast computing. "The realization of the exciton condensate in a trap opens the opportunity to study...

Single Nanomaterial Yields Many Laser Colors
2012-04-30 07:46:35

Engineers at Brown University and QD Vision Inc. have created nanoscale single crystals that can produce the red, green, or blue laser light needed in digital displays. The size determines color, but all the pyramid-shaped quantum dots are made the same way of the same elements. In experiments, light amplification required much less power than previous attempts at the technology. The team´s prototypes are the first lasers of their kind. Red, green, and blue lasers have become small...

2012-03-30 07:50:23

Physicists at the University of California, San Diego have discovered patterns which underlie the properties of a new state of matter. In a paper published in the March 29 issue of the journal Nature, the scientists describe the emergence of “spontaneous coherence,” “spin textures” and “phase singularities” when excitons–the bound pairs of electrons and holes that determine the optical properties of semiconductors and enable them to function as...

Word of the Day
  • A stinking tobacco.
  • Offal; waste animal product; organic matter unfit for consumption.
This word comes from the Spanish 'mondongo,' tripe, entrails.