microscope image of a silicon membrane (IMAGE) University of Chicago Caption University of Chicago scientists invented an entirely new way to make a solar cell: by etching holes in the top layer to make it porous. Above, a microscope image of a silicon membrane after the etching process. Credit University Of Chicago: Physical Sciences Division - Tian Lab Usage Restrictions Proper attribution License Original 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.