Yuanyuan Wang, University of Chicago (IMAGE) University of Chicago Caption UChicago postdoctoral researcher Yuanyuan Wang holds a 'mask' or stencil used to pattern nano materials with a new process that promises to make them far easier to make into LEDs, solar cells, transistors and other electronics. Credit University of Chicago Usage Restrictions With credit 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.