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Last updated on April 24, 2014 at 17:35 EDT

Latest Exciton Stories

2009-06-18 15:19:38

New research by a team of University of Toronto scientists could lead to substantial advancements in the performance of a variety of electronic devices including digital cameras. Researchers created a light sensor "“ like a pixel in a digital camera "“ that benefits from a phenomenon known as multi-exciton generation (MEG). Until now, no group had collected an electrical current from a device that takes advantage of MEG. "Digital cameras are now universal, but they suffer from a...

2009-05-06 08:52:35

 Researchers at the Harvard School of Engineering and Applied Sciences (SEAS), in collaboration with researchers from Worcester Polytechnic Institute (WPI), have demonstrated, for the first time, that the activation energy of impurities in semiconductor nanowires is affected by the surrounding dielectric and can be modified by the choice of the nanowire embedding medium.The finding, published in the April 6 issue of Applied Physics Letters, helps to confirm the "dielectric confinement...

2009-03-09 11:25:00

Research led by the University of Warwick has found a way to use doughnut shaped by-products of quantum dots to slow and even freeze light, opening up a wide range of possibilities from reliable and effective light based computing to the possibility of "slow glass". The key to this new research is the "exciton". This describes the pairing of an electron that has been kicked into a higher energy state by a photon, with a hole or gap it (or another electron) leaves within the shell or orbit...

2008-10-07 03:00:19

By Xu, Zhihua Zang, Huidong; Hu, Bin Organic semiconducting materials have demonstrated attractive light-absorption and photocurrent-generation functions due to their delocalized pi electrons as well as intra-molecular and inter- molecular charge separation processes. On the other hand, organic semiconducting materials have easy property tuning, are mechanically flexible, and have large-area thin film formation properties. As a result, organic materials have become potential candidates in...

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2008-04-28 09:15:00

Imagine a technology that would not only provide a green and renewable source of electrical energy, but could also help scrub the atmosphere of excessive carbon dioxide resulting from the burning of fossil fuels. That's the promise of artificial versions of photosynthesis, the process by which green plants have been converting solar energy into electrochemical energy for millions of years. To get there, however, scientists need a far better understanding of how nature does it, starting with...

2005-06-21 18:30:00

PITTSBURGH - When light hits a semiconductor material and is absorbed, its photons can become "excitons," sometimes referred to as "heavy photons" because they carry energy, like photons, but have mass, like electrons. Excitons typically exist for only a short time--trillionths of a second--and travel only a few microns before turning back into photons, which are then emitted from the material. In the June 10 issue of the journal Physical Review Letters, scientists from the University of...