Efficiency Measurement (IMAGE) University of Chicago Caption Luping Yu (left) watches as Luyao Lu prepares to measure the external quantum efficiency of their newly developed polymer solar cell. The new type of solar cell was a joint project of the University of Chicago and Argonne National Laboratory. Credit Andrew Nelles Usage Restrictions News organizations may use this image in connection with reports about the research of Luyao Lu, Luping Yu and their associates. 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.