Tungsten Diselenide on Silicon Oxide (image) University of Washington Caption This is a close-up view of a single layer of atoms of the semiconductor material, tungsten diselenide, on silicon oxide. The ability to see the contrast of the single layer of atoms against the background shows how strongly these materials interact with light. Credit U of Washington Usage Restrictions Photo credit required. 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.