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Solar Energy Harvesting Breakthrough
MERCED, Calif. — A team of researchers at the University of California, Merced, have redesigned luminescent solar concentrators to be more efficient at sending sunlight to solar cells.
The advancement could be an important breakthrough for solar energy harvesting, said UC Merced physics Professor Sayantani Ghosh, who led the project.
“We tweaked the traditional flat design for luminescent solar concentrators and made them into cylinders,” Ghosh said. “The results of this architectural redesign surprised us, as it significantly improves their efficiency.”
The main problem preventing luminescent concentrators from being used commercially is that they have high rates of self-absorption, Ghosh said, meaning they absorb a significant amount of the light they produce instead of transporting it to the solar cells.
The research team showed the problem can be addressed by changing the shape of the concentrator. They discovered a hollow cylindrical solar concentrator is a better design compared with a flat concentrator or a solid cylinder concentrator. The hollow cylinders absorb more sunlight while having lower self-absorption losses.
Luminiscent solar concentrators are designed to absorb solar radiation over a broad range of colors and re-emit it over a narrower range (for example, only red), a process known as down-converting. This light is transported to solar cells for photocurrent generation. The quantum dots embedded in the concentrator are the materials that carry out this color conversion.
The biggest advantage they offer over traditional solar cells is that they can work even in diffuse sunlight, like on cloudy days. And because of this, they do not need to directly face the sun at all times, eliminating the need for tracking mechanisms.
Ghosh said the discovery could make commercially viable luminescent solar concentrators a reality, especially because the design enhances performance while using the same number of quantum dots, therefore without being more costly.
This saves on infrastructure costs and also opens up the possibility that the collectors can be integrated onto vertical surfaces like walls and windows. The next step is to develop a large array of hollow cylindrical luminescent solar concentrators and track the efficiency of the panel.
Richard Inman, Georgiy Shcherbatyuk, Dmitri Medvedko and Ajay Gopinathan are the other members of the team that conducted this research.
Inman served as the lead researcher while he was an undergraduate at UC Merced, an example of the hands-on learning opportunities available to students. He’s now a graduate student at UC San Diego. Medvedko is an undergraduate student, and Shcherbatyuk is a graduate student. Gopinathan is a physics professor.
The team published a paper on the work, “Cylindrical luminescent solar concentrators with near-infrared quantum dots,” in the journal Optics Express last fall.
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Information provided by UC Merced
Energy Bills Increase in 2012
(bw) CALIFORNIA.— While the value of the dollar has decreased over the last several years and U.S. consumer prices increased to 3.4 percent over 2011 the cost of living continues to raise for Northern and Central California residents.
The 2011 Top 10 Stories Most Read
As we begin 2012, Bilingual Weekly’s newsroom extracted the top 10 most read stories during the last 352 days. Please note that the top 10 stories were not selected by the Bilingual Weekly’s staff, our team ran the www.bilingualweekly.com English website’s analytics’ report which evaluates the hits received daily and it ranked each story from the highest number of hits to the lowest ranking in local news coverage. The following stories are briefs of the top 10 stories you, our readers clicked on.
UC DAVIS HEALTH SYSTEM SIGNS AGREEMENT, PARTNERS TO ADVANCE HEALTH IN SINALOA, MEXICO
SACRAMENTO, CA —UC Davis Health System has signed a memorandum of understanding (MOU) with the state of Sinaloa, Mexico, to partner to improve the health and well-being of its residents through the exchange of ideas, data and research on telehealth, scientific and technical development, and neurodevelopmental disorders.
Study Shows Sugarcane Ethanol Production Causes Air Pollution
UC Merced researchers show burning of sugarcane fields prior to harvest can create more pollution than previously thought, detracting from benefits of the alternative fuel source
MERCED, Calif. — The burning of sugarcane fields prior to harvest for ethanol production can create air pollution that detracts from the biofuel’s overall sustainability, according to research published recently by a team of researchers led by scientists at the University of California, Merced.
Scientists Propose Thinning Sierra Forests to Enhance Water Runoff
Less water used by trees would result in more runoff, which could benefit farmers and water managers statewide; Project will examine impacts on forest health and other ecosystem services
MERCED, Calif. — Runoff from the Sierra Nevada, a critical source of California’s water supply, could be enhanced by thinning forests to historical conditions, according to a report from a team of scientists with the University of California, Merced, UC Berkeley and the Environmental Defense Fund.
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