Tag: electron
Scientists create first solar cell with over 100 percent quantum efficiency
by admin on Dec.19, 2011, under High End Tech
Researchers over at the National Renewable Energy Lab have reportedly made the first solar cell with an external quantum efficiency over 100 percent. Quantum efficiency relates to the number of electrons-per-second flowing in a solar cell circuit, divided by the number of photons from the energy entering. The NREL team recorded an efficiency topping out at 114 percent, by creating the first working multiple exciton generation (MEG) cell. Using MEG, a single high energy photon can produce more than one electron-hole pair per absorbed photon. The extra efficiency comes from quantum dots ‘harvesting’ energy that would otherwise be lost as heat. The cell itself uses anti-reflection coating on a transparent conductor, layered with zinc oxide, lead selenide, and gold. NREL scientist Arthur J. Nozik predicted as far back as 2001 that MEG would do the job, but it’s taken until now for the concept to leap over from theory. The hope is, of course, that this will lead to more competitively priced solar power, fueling the transport of the future.So in the future who owns the most desert wins the power race.. oh wait. isn’t that the middle easterners again. ;D
By Engadget
Intel Milestone Confirms Light Beams Can Replace Electronic Signals for Future Computers
by admin on Jul.28, 2010, under High End Tech
Intel Creates World’s First End-to-End Silicon Photonics Connection with Integrated Lasers; Could Revolutionize Computer Design, Dramatically Increase Performance, Save Energy
SANTA CLARA, Calif., July 27, 2010 – Intel Corporation today announced an important advance in the quest to use light beams to replace the use of electrons to carry data in and around computers. The company has developed a research prototype representing the world’s first silicon-based optical data connection with integrated lasers. The link can move data over longer distances and many times faster than today’s copper technology; up to 50 gigabits of data per second. This is the equivalent of an entire HD movie being transmitted each second.
Today computer components are connected to each other using copper cables or traces on circuit boards. Due to the signal degradation that comes with using metals such as copper to transmit data, these cables have a limited maximum length. This limits the design of computers, forcing processors, memory and other components to be placed just inches from each other. Today’s research achievement is another step toward replacing these connections with extremely thin and light optical fibers that can transfer much more data over far longer distances, radically changing the way computers of the future are designed and altering the way the datacenter of tomorrow is architected.
