|
August 25, 2014 - Author: Giles Parkinson
Argonne’s “Green Fleet” & Solar-Powered Electric Vehicle Charging StationAnalysts from UBS and Citigroup, two of the world’s largest investment banks, believe the growth of solar power, in combination with advances in batteries and electric cars, will cause a huge disruption in the energy industry. UBS believes centralised fossil fuel generation will become “extinct” sooner than most people realise. Citigroup predicts renewables will replace coal and gas in power generation, which will free up the use of gas as a substitute for oil in transport. Giles Parkinson of the Australian website Reneweconomy.com.au has the story.
Leading investment bank UBS says the payback time for unsubsidised investment in electric vehicles plus rooftop solar plus battery storage will be as low as 6-8 years by 2020 – triggering a massive revolution in the energy industry.
http://www.energypost.eu/ubs-citigroup-warn-investors-massive-revolution-energy-industry/
Hallo Zusammen,
ein sehr interessanter Artikel besonders über den neusten Fortschritt von Grätzel und seinen koreanischen Mitstreitern.
Controlled Crystals Make a New Solar Material Practical
A new kind of low-cost, high efficiency solar cell emerges thanks to crystals known as perovskites.
By Katherine Bourzac on August 31, 2014
Why It Matters
The adoption of solar power is limited by the cost of commercial solar cells.
A new way to control the growth of crystalline materials called perovskites could lead to commercial solar cells that hit a sweet spot of high performance and low cost. Although individual perovskite cells have achieved promising results in the lab, until now it hasn’t been clear how they might be made in uniform batches.
Certain perovskites can harvest the energy of sunlight very efficiently because they strongly absorb both visible and infrared light. And unlike silicon films, which are made at high temperatures, perovskite films can be made from solution at much lower temperatures. It should be possible to make perovskite solar cells using low-cost, low-energy methods such as printing.
The first perovskite cells were made in 2009, but the best can already convert 17.9 percent of the energy in sunlight into electricity. That’s starting to be competitive with commercial thin-film cells like cadmium telluride and silicon, says Timothy Kelly, a chemist at the University of Saskatchewan in Saskatoon, Canada.
Michael Grätzel, a chemist at the École Polytechnique Fédérale de Lausanne, Switzerland, and Nam-Gyu Park, a chemist at Sungkyunkwan University in Korea, have now worked out a recipe for taking control of that process. They found that by carefully controlling the concentrations of the starting solutions, and other processing conditions, they could consistently make perovskite films with the larger crystals needed for an efficient solar cell.
The Swiss and Korean groups used these methods to make perovskite solar cells with an average efficiency of 16.4 percent, and very little variation in efficiency between different cells.
Park says that now that it’s possible to make high-quality perovskite reliably, it’s time to deal with other problems with the material. One is that humidity causes the materials to break down and leak methyl ammonium. Park says that researchers either need to find a way to seal perovskite solar cells against humidity or find new versions of the materials. Another problem is that the materials are made using lead, which is toxic.
“Having learned from these materials, we should move to others, because lead is not environmentally benign, and this material is not stable,” says Mercouri Kanatzidis, a chemist at Northwestern University in Illinois. He and Northwestern materials scientist Robert Chang have been developing a lead-free perovskite that substitutes tin. It currently only converts light into electrical power with an efficiency of 6 percent. But they’re both optimistic, pointing to how the lead-based materials improved rapidly from about 3 percent in 2009 to about 18 percent today.
Meantime, Grätzel believes that the existing materials haven’t hit their upper performance limits yet.
“I think 20 percent efficiency should be possible in the near term,” he says.
Grätzel scheint in der Zusammenarbeit mit den koreanischen Instituten mal wieder eine Nase voraus zu sein! Dieser Greatcell macht einfach den Unterschied. Ohne ihn hätte ich meine Aktien schon vor Jahren verkauft.
Sie kommen ihrem Ziel immer näher!
Grüße
dyehard
http://www.technologyreview.com/news/530456/...ar-material-practical/
|
| Wertung | Antworten | Thema | Verfasser | letzter Verfasser | letzter Beitrag | |
| 11 | Greatcell Solar Verlustrealisierung - Aktientausch | douglas_h | douglas_h | 25.04.21 10:54 | ||
| 3 | 296 | GREATCELL SOLAR, jetzt erst recht! | 24dan | SonneMW | 25.04.21 03:20 | |
| 46 | 12.742 | Dyesol LTD, es geht weiter ! | Boersenharry | Fortunato69 | 25.04.21 02:20 | |
| 7 | DYESOL - Wieviel Aktien halltet Ihr? 07_2014 | Steff23 | chinasky | 25.04.21 01:51 | ||
| 18 | DYESOL - Wieviele Aktien haltet Ihr? 09_2014 | Steff23 | Steff23 | 25.04.21 01:27 |