William "Chops" Westfield mac.com> writes: > Multi-layer cells aren't new, but the 40.7% number is a significant > improvement over the typical triple-junction cell (which IIRC hovers > around 27%) The layers aren't as easy as you might think; each junction > is going to be optimal at a particular wavelength, so three junctions > implies using pretty exotic semiconductors... It would be much more interesting to ask whether the new cells are more than about 25% more expensive than the old ones ... (my bet is that they are) Peter -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist