Nanoshell Thin-film Photovoltaic Cell (IMAGE) Stanford University School of Engineering Caption This scanning electron microscope image shows a cross section of a layer of hollow nanoshells made of photovoltaic silicon. The thin spherical structure improves light absorption by trapping the light inside the material, creating what are known as optical whispering galleries. Credit Yan Yao 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.