Ultrathin Photocathode with High Efficiency Researchers demonstrate a single-crystal photocathode th

Ultrathin Photocathode with High Efficiency Researchers demonstrate a single-crystal photocathode that can emit electrons with higher efficiency than its predecessors. […] Scientists use optical microscopes to reveal otherwise invisible worlds, such as those inhabited by wriggling microorganisms and dividing cells. More detailed views of these systems are obtainable via devices such as ultrafast time-resolved electron microscopes, which use electrons rather than photons to image. In these microscopes, the electrons are generated using a photocathode, which emits electrons when illuminated with light. High-performing photocathodes have been around for nearly a century, but scientists have struggled to improve their efficiencies and performance, in part because of the extreme reactivity of the materials from which they are made. Now, a team of researchers from Cornell University has demonstrated a photocathode with an efficiency up to 10 times higher than other photocathode devices [1]. Read more. -- source link

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