Novel Ultrabright and Air‐Stable Photocathodes Discovered from Machine Learning and Density Functional Theory Driven Screening (Adv. Mater. 44/2021)

Photocathode Materials The discovery of high‐brightness photocathode materials can considerably expand the capabilities of X‐ray free‐electron laser facilities. In article number 2104081, Evan R. Antoniuk, Evan J. Reed, and co‐workers perform a comprehensive screening of over 74 000 materials to identify novel photocathode candidates. The newly discovered materials are demonstrated to achieve higher brightness and superior air stability than the current state‐of‐the‐art.