Ultrathin films of cesium antimonide used to make more efficient photocathodes

https://phys.org/news/2022-03-ultrathin-cesium-antimonide-efficient-photocathodes.html

"when converting green light into electrons, the efficiency of their photocathode was greater than 2% and its process was as short as 10 fs, significantly faster than conventional photocathodes. They conclude that similar photocathodes could be used to create new devices with significant brightness enhancements"