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When crystal lattices differ too much, poets for example, strain damages the crystals. The most efficient multijunction solar cell yet made -- 30 percent, out of a possible 50 percent efficiency -- has just two layers. " "Two layers of indium gallium nitride, one tuned to a band gap of 1.7 eV and the other to 1.1 eV, could attain the theoretical 50 percent maximum efficiency for a two-layer multijunction cell. (Currently, no materials with these band gaps can be grown together.) Or a great many layers with only small differences in poets their band gaps could be poets stacked to approach the maximum theoretical efficiency of better than 70 percent. It remains to be seen if a p-type version of indium gallium nitride suitable for solar cells can be made.
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