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Strategies & Market Trends : 2026 TeoTwawKi ... 2032 Darkest Interregnum

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Nov 28 4:00 PM EST

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To: TobagoJack who wrote (40557)	10/1/2008 3:25:19 AM
From: Haim R. Branisteanu	Read Replies (3) of 218072

THE END OF OIL TYRANY? US Solarcell Design Hits 40 Precent Efficiency - countdown to solar singularity by Staff Writers Golden CO (SPX) Sep 30, 2008 Scientists at the U.S. Department of Energy's National Renewable Energy Laboratory (NREL) have set a world record in solar cell efficiency with a photovoltaic device that converts 40.8 percent of the light that hits it into electricity. This is the highest confirmed efficiency of any photovoltaic device to date. The inverted metamorphic triple-junction solar cell was designed, fabricated and independently measured at NREL. The 40.8 percent efficiency was measured under concentrated light of 326 suns. One sun is about the amount of light that typically hits Earth on a sunny day. The new cell is a natural candidate for the space satellite market and for terrestrial concentrated photovoltaic arrays, which use lenses or mirrors to focus sunlight onto the solar cells. The new solar cell differs significantly from the previous record holder " also based on a NREL design. Instead of using a germanium wafer as the bottom junction of the device, the new design uses compositions of gallium indium phosphide and gallium indium arsenide to split the solar spectrum into three equal parts that are absorbed by each of the cell's three junctions for higher potential efficiencies. This is accomplished by growing the solar cell on a gallium arsenide wafer, flipping it over, then removing the wafer. The resulting device is extremely thin and light and represents a new class of solar cells with advantages in performance, design, operation and cost. NREL's Mark Wanlass invented the original inverted cell, which recently won a R&D 100 award. His design was modified by a team led by John Geisz that further optimized the junction energies by making the middle junction metamorphic as well as the bottom junction. Metamorphic junctions are lattice mismatched " their atoms don't line up. The material properties of the mismatched semiconductors allows for greater potential conversion of sunlight. Haim remarks - Solar radiation on a square meter is around 400 to 600 watt per hour for each sunny day in the Northern / Southern Hemisphere - which is more than residential user use in the modern world. Brazil could be an exporter of electricity, India stop building coal power plants etc. Sahara and ME net electricity exporters, as will be Mexico / Southern US

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