Scientists report first solar cell producing more electrons in photocurrent than solar photons entering cell
The external quantum efficiency for photocurrent, usually expressed as a percentage, is the number of electrons flowing per second in the external circuit of a solar cell divided by the number of photons per second of a specific energy (or wavelength) that enter the solar cell. None of the solar cells to date exhibit external photocurrent quantum efficiencies above 100 percent at any wavelength in the solar spectrum. The external quantum efficiency reached a peak value of 114 percent. The newly reported work marks a promising step toward developing Next Generation Solar Cells for both solar electricity and solar fuels that will be competitive with, or perhaps less costly than, energy from fossil or nuclear fuels. A paper on the breakthrough appears in the Dec. 16 issue of Science Magazine. Titled "Peak External Photocurrent Quantum Efficiency Exceeding 100 percent via MEG in a Quantum Dot Solar Cell," it is co-authored by NREL scientists Octavi E. Semonin, Joseph M. Luther, Sukgeun Choi, Hsiang-Yu Chen, Jianbo Gao, Arthur J. Nozikand Matthew C. Beard. The research was supported by the Center for Advanced Solar Photophysics, an Energy Frontier Research Center funded by the DOE Office of Science, Office of Basic Energy Sciences. Semonin and Nozik are also affiliated with the University of Colorado at Boulder.
On behalf of the State Ministry of the Environment of Hesse, TÜV SÜD developed a wind map for the German federal state of Hesse. The wind map offers a high level of accuracy which makes it an important tool for identifying wind priority areas.
We believe that system owners and installers should take an active role in understanding how their system is performing and that basic web based monitoring should be free and flexible. Adhering to this philosophy, we have designed the ZigBee based monitoring solution for the PV Powered HE string inverter to make string inverter performance monitoring fast, easy, simple, reliable and flexible.
Eastern Shore Energy, LLC (ESE) announced today they have reached a preliminary financing agreement with Benjamin Travis, COO of World Equity Alliance, Inc (WEA). Based upon this agreement, the WEA Energy Private Equity Fund, LP intends to invest, as a joint venture partner in the development for the ESE projects.
Statement by Alliance to Save Energy President Kateri Callahan
Soitec purchases manufacturing facility in San Diego to locally produce CPV modules for the U.S. renewable energy market
• Acquisition part of an Investment by Soitec of more than $150-Million • 200 MW per year Manufacturing Capacity with Room for Future Expansion • Creation of 450 on-site Jobs and More Than 1,000 Indirect Jobs at Full Capacity
Geothermal Energy Association commends Senate Energy Committee on passage of new geothermal legislation
"These two measures will support exploration drilling, expand geothermal research into heating uses, and expedite leasing and development," remarked GEA Executive Director Karl Gawell.
Terry Anderson, President of TRA-MAGE in American Fork Utah, receives his second patent for a new roof product - The Ridge Riser®.Ridge Riser®
4 kWp solar, 16 kWh storage project and collaboration with Everest Ingeniería SRL for water pumping
Warren Buffett's MidAmerican Energy Holdings made its second foray into solar energy in as many weeks, saying on Friday it will buy a 49 percent stake in an Arizona power plant from NRG Energy Inc (NRG.N). MidAmerican, the utility affiliate of Buffett's holding company Berkshire Hathaway Inc (BRKa.N), said it will take a stake in the 290-megawatt Agua Caliente project in Yuma County, Arizona. The plant is being built by solar power company First Solar Inc (FSLR.O) and is supported by a $967 million loan guarantee from the U.S. Department of Energy. The announcement comes a little over a week after MidAmerican said it would buy First Solar's 550 MW Topaz Solar Farm power plant in California.
Biomass experts outline future economic growth of industry in the final WERC webinar.
Tough times for the Chinese wind turbines manufacturers: safety, quality, reliability and after-sale service may well tilt the scales in favour of Western companies
SolarWind USA™ Helps Stevenson High School Earn LEED Gold Certificate, Becoming the First Public High School to Receive Environmental Honor
Helped Deploy Hybrid Solar Thermal/Solar Photovoltaic Power Generating System
More than twenty UK wind farm sites adopt Natural Power's ForeSite™ wind forecasting service for energy trading and grid notification purposes
Strategic stake in US-based GreenVolts strengthens ABB's focus on renewables
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