Abstract
Photoelectric properties of carbon-based thin films are investigated by UV pulsed laser-induced photoelectric charge measurements. Photocathodes are thin films deposited on different substrates by vacuum deposition methods. Laser irradiation consists of fifth harmonic (λ=213 nm) picosecond pulses of a Nd-YAG laser. Samples are irradiated at low laser intensities (approx. a few MW/cm2) in order to avoid pronounced structural transformations at their surface. Quantum yield (QY) values are determined at 213 nm; UV laser-induced surface cleaning process and air contamination effects on electron emission are studied. The highest QY value is obtained for the hydrogenated diamond photocathode according to its low surface potential barrier (NEA emitter). This QY value is decreasing after air exposure of the post-irradiated sample; on the other hand, electron emission from nanostructured fullerene films can be enhanced by a UV surface cleaning process.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
