Fraunhofer
Institute researchers achieve record solar efficiency of 41.1% by managing the quality of solar cell metamorphic growth. ...
... "The researchers at Fraunhofer ISE have succeeded in overcoming this obstacle. They have managed to localize the defects in a region of the solar cell that is not electrically active. As a result, the active regions of the solar cell remain relatively free of defects – a prerequisite for achieving the highest efficiencies. " ...
Via Fraunhofer Institute:
World record efficiency reached for multi-junction solar cells at Fraunhofer