Sil­ica shade for so­lar cells

Down to Earth - - SCIENCE -

can reach a tem­per­a­ture of 130o Cel­cius un­der nor­mal op­er­at­ing con­di­tions and for ev­ery de­gree rise in tem­per­a­ture, their ef­fi­ciency de­creases by about half a per cent. But the prob­lem of over­heat­ing can be over­come by cov­er­ing the cell with an ex­tremely thin layer of sil­ica glass embed­ded with mi­cro­scopic pyra­midi­cal struc­tures. By con­trol­ling the shape of the pyra­mids the in­frared light of the sun, which is the pri­mary car­rier of heat, can be ra­di­ated back into the at­mos­phere. Op­tica, July 22

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