Eray Aydil, University of Minnesota (IMAGE) University of Minnesota Caption U of M researchers have cleared a major hurdle in the drive to build solar cells with potential efficiencies up to twice as high as current levels. Credit © University of Minnesota Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.