CIGS which are 17.7 percent effficient
The average efficiency of regular solar panels is 15 percent; thin-film solar cells register a lower efficiency percentage than that. Japan’s National Institute of Advanced Industrial Science and Technology (AIST), however, claims 17.7 percent efficiency for its flexible thin-film CIGS solar cell. To be able to achieve that impressive percentage, AIST devised CIGS technology called “alkali-silicate glass thin layer (ASTL) method.”
The said method can facilitate alkali metal’s addition onto the substrate to form the solar cells, increasing the cell’s conversion efficiency. The company used three different materials as substrates : a ceramic substrate, Teijin Ltd’s transparent plastic film, and a foil made of titanium with a coarse surface. The last substrate, titanium foil, brought about the 17.7 percent record efficiency.
The technology’s nitty-gritty would be unveiled during the 4th Annual Symposium of Research Center for Photovoltaics on July 28-29, 2008
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The problem with most thin-film solar technologies is that they are often manufactured with expensive and sometimes harmful substances such as gallium and indium. How do these models measure up?
I am more a fan of CPV (Concentrator Photovoltaic) systems, as they are cheaper and more efficient. SolFocus has a model that achieves 40% efficiency:
http://www.brightfuture.us/new/index.php?option=com_content&task=view&id=84&Itemid=27
I think that the game is not over for anyone. It’s all about continuous research of technologies, which are cometeing between each and one of them…. I like the nanosolar’s one .. http://www.best-solar-energy.com/solar-cells/nanosolar-ships-first-panels/
Vladan